ASR Audio Systems Emitter I, II integrated amplifier User manual

ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

0.0 Table of Contents of this manual

1.0 Receiving the ASR Emitter – First moves and setup.....................................2

1.1 Unpacking the ASR Emitter........................................................................................2

1.2 Important safety precautions.......................................................................................2

1.3 Placing the Emitter units.............................................................................................3

1.4 Connecting the separate power supplies to the ASR Emitter......................................4

1.5 Connecting the ASR Battery Power Supply................................................................5

1.6 Burn-in time................................................................................................................6

2.0 Connecting the ASR Emitter to your system..................................................6

2.1 Standard connections.................................................................................................6

2.2 Balanced input……...................................................................................................7

2.3 Connecting of a single source to the direct input .....................................................7

2.4 Input impedance adjustment …………………….....................................................8

2.5 The Tape Output for Tape recording or headphone amplifiers..................................8

2.6 Connecting a tape deck to the ASR Emitter...............................................................8

2.7 Connecting speakers to the ASR Emitter ..................................................................9

2.8 additionally speakers outputs or headphone output...................................................9

2.9 Connecting to subwoofers or external main amplifiers...........................................10

3.0 Operating the ASR Emitter............................................................................11

3.1 General operation of the ASR Emitter......................................................................11

3.2 Front panel control knobs of the ASR Emitter..........................................................11

3.3 Operating the ASR Emitter via ASR remote control................................................12

3.4 Adjustments of the ASR Emitter...............................................................................13

4.0 Protection circuits of the ASR Emitter..........................................................16

4.1 Offset protection circuit.........………………….…….…...........................................16

4.2 Distortion- and Overload-protection circuit...............................................................16

4.3 Over-temperature protection circuit...........................................................................16

5.0 Maintenance of the ASR Emitter...................................................................17

5.1 Cleaning of the ASR Emitter......................................................................................17

5.2 Resetting the ASR Emitter after malfunctions...........................................................17

5.3 Checking fuses in the power supply units..................................................................18

5.4 External battery power supply....................................................................................18

5.5 The Remote control....................................................................................................18

5.6 Noise from the main unit while warming up/cooling off...........................................18

5.7 Just in case: repair.......................................................................................................18

6.0 Facts about the ASR Emitter.......................................................................19

6.1 Function and led description of ASR Emitter main unit with position plans.............19

6.2 Function description of the external power supply... ........ ........................................22

6.3 Function description of the ASR battery power supply..............................................23

7.0 Technical Data...............................................................................................24

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

Dear music lover,

all of us at ASR would like to offer thanks and congratulations to you for purchasing the

ASR Emitter High End Integrated Amplifier. We sincerely believe that your new ASR Emitter

will enjoy you for many years with musical pleasure.

All ASR products are hand-made with greatest care to details with high-grade selected parts.

Enjoy your music even more with this true High End Integrated Amplifier!

While every new owner is anxious to begin listening, we encourage you to take a few minutes

to read this manual and familiarize yourself with the full capabilities of the ASR Emitter.

1. Receiving the ASR Emitter – First moves

1.1. Unpacking the ASR Emitter

Please be carefull when you are unpacking your ASR Emitter. Please don’t cut the tapes of the wrapping and keep the packing for maybe necessary transports. Please inspect the units for any shipping damage and call your dealer immediately if any damage is found.

! Do not plug your ASR Emitter into an AC outlet in case you find shipping damage !

The shipment contains of the following items and accessories : a)

Integrated amplifier ASR Emitter

main unit with three golden or chromium control knobs b)

Separate power supply (ASR Emitter I = one, ASR Emitter II = two)

(ground switch at the rear panel) incl. one/two shielded ASR power cords c)

ASR remote control d) repair-set (1x 3 mm-Allen-wrench, replacement screws M4 x 16, fuses )

Emitter II is equipped with a set of 4 Spikes and 4 spike platforms e)

Care-set ( 1x bottle of antistatic plastic-cleaner and a special cloth ) f)

Battery Power Supply (no controls) inclusive one ASR power cord

(available as option for the ASR Emitter Exclusive versions)

1.2. Important safety precautions

To get the best performance from your ASR Emitter, and for your own safety, please read and follow these important safety instructions.

! Damages caused by improper operation is not covered by the ASR warranty !

1. Do not place the ASR Emitter or the power supply units near heat sources such as radiators, fireplaces, stove, or other appliances that produce heat. Avoid also placing the ASR Emitter where it will be subject to direct sunlight or low temperatures.

2. Check the voltage label at the power supply’s rear panel and compare with the AC line

voltage that is used in your country. If the voltage specified is different from your AC voltage, contact your ASR dealer. Attempting to use your ASR Emitter at any voltage other than the specified may damage the unit.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

3. The Emitters are equipped with AC power cords with three plugs that include an earth

ground connection. To prevent shock hazard, the earth ground connection should be used.

If your electrical outlets does not have separate ground connection please use other ones that have a earth ground connection. If you are not sure of the integrity of your home’s electrical system, contact a licensed electrician for assistance.

4. AC extension cords are not recommended for use with this product.

In case an extension cord is necessary be sure it is an approved type and has sufficient current carrying capacity to power the Emitter.

5. Before cleaning the ASR Emitter, always turn Off the unit and unplug the AC supply cords.

6. If you smell smoke, or an abnormal smell, immediately turn Off the ASR Emitter

and unplug the unit from the power supply and contact your ASR dealer.

7. Don’t expose the Emitter to water or any liquid. Unplug immediately if the unit becomes wet.

8. Replace fuse only with the exact type originally included. external power supplies

115 Volt: 16 Amps, Neozed slow-blow

ASR Battery PSU charging trafo

1 Amps, slow-blow

230 Volt: 10 Amps, Neozed slow-blow 0,5 Amp, slow-blow

9. THERE ARE NO SERVICEABLE PARTS INSIDE THE ASR EMITTER !

- Do not attempt to repair or modify your ASR Emitter.

- All service should be performed by qualified service personnel.

-

Do not open the units while it is attached to the AC outlet.

1.3. Placing the Emitter and PSU units

The heat sinks of the ASR Emitter radiate some heat, so please place the main unit in a place, where air can circulate around the heat sinks.

Please never put another unit on top of the main unit !

Especially no PSU units or any equipment with trafos !

Please place other units in a rack below the main unit,

In case you use a rack please put any PSU on a separate platform

The ASR AC power supplies do not radiate much heat, the battery PSU is normally cool.

For best sonic performance please do not stack the ASR power supplies units nor place the ASR power supply units too close to the main unit.

The distance from an AC PSU to the main unit should be at least 15 cm.

The battery unit can be place near the main unit, in operation the Batt PSU has no radiation.

The Emitter II can also be placed using the spikes included with the delivery.

Please install the Spikes into the threads in the heatsinks and use the metal bar to tighten them.

When you use the spike platforms, the Emitter feets are some millimetre away from the position place and from that the feets can stay mounted on the Emitter main unit.

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1.4. Connecting the separate AC power supplies to the ASR Emitter

Due to the very high power capability of the ASR Emitters, the external AC power supplies have very high currents and from that needs a very good connection to the AC Power network.

From that the AC PSUs have to be connected direct to wall AC outlets.

Please connect the power supplies to the ASR Emitter in the following order: a) turn OFF the ASR Emitter (left control knob to „OFF“-position), b) carefully connect the heavy silver cables (with grey plug with 24 contacts) coming from the rear panel of the ASR Emitter main unit to the socket on the rear panel of the external power supply.

The ASR Emitter II is equipped with two cables coming from the rear panel.

Both power supplies of the Emitter II are identical, you can connect each to each channel. c) connect the power cords to AC input of the power supplies, d) connect the power cords to the power outlet.

Disconnection of the external ASR power supplies is made in the following order : a) turn OFF the ASR Emitter (left control knob to „OFF“-position), b) disconnect the power cords from the AC outlet, c) wait until the leds inside the ASR power supplies are not shining anymore, d) disconnect the heavy silver cable from the power supplies.

If the connection between the ASR Emitter’s main unit and the power supplies has been disconnected before the leds have gone out, please wait at least two hours before you connect the power supplies again. This will avoid damages to the contacts in the plugs.

Tipp: power cords have a big influence on the obtainable sound quality. We recommend the use the ASR Active Magic Power cord on all other components in your audio system.

Phase mark at IEC socket and AC connector

At the power supplies the phase at the IEC socket is the left pin at the view onto the socket.

In case your power cable is equipped on AC Network side with Schuko connectors the phase pin is marked with a white ring.

Ground lift switch

The ground lift switch is located on the rear panel of the Power supplies above the AC input.

Switching to position „1“ will connect the ground of the power supply to the ground of the connected source components (on the RCA inputs).

The Audio ground should be connected one time to the power supply ground in every audio system. In case the ground is connected more than one time hum may occur and the sound can be worsened. Switching to position „0“ disconnects the ground connection as described above.

In any doubt: please switch the ground lift switch to „1“.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

1.5.

Connecting the ASR Battery Power Supply

The input stages of the ASR Emitter Exclusive versions can be supplied with the optional

ASR Battery Power Supply. The standard power supplies should be connected first before you connect the ASR Battery Power Supply to the ASR Emitter Exclusive (refer 1.4).

Connect the ASR Battery Power Supply in the following order: a) turn OFF the ASR Emitter Exclusive (left control knob to „Off“-position) and b) carefully connect the heavy silver cable (with grey plug featuring 16 contacts) coming out of the rear panel of the ASR Emitter Exclusive´s main unit to the socket on the rear panel of the ASR Battery Power Supply. c) connect the power cord to the AC input of the ASR Battery Power Supply. d) connect the power cords to the AC outlet. A blue led at the main boards shows up..

Please disconnect the external ASR Battery Power Supply in the following order a) turn OFF the ASR Emitter Exclusive (left control knob to „Off“-position) b) wait till the blue leds in the battery PSU unit have gone away. the two green leds from batt Full will remain on. c) disconnect the heavy silver cable from the ASR Battery Power Supply.

The battery PSU should be kept connected to the AC to keep the batteries full.

When the batteries are empty from not charged the batteries may be destroyed.

So in case you do not use the Battery PSU please connect he battery PSU at least for

1 day a month to the AC power network to avoid damages.

1.6.

Burn-in time

Straight out of the box, the performance of the ASR Emitter is not as impressive as the performance of a unit that has been used for longer time and so is broken in. Why?

Each ASR Emitter needs at least 100 to 200 hours of playing music to break in.

Especially the ASR Emitter Exclusive battery versions with the very large amounts of capacitors inside have to stabilize over the initial 200 hours of playing.

Tipp: connect your CD player to the ASR Emitter and play a CD with dynamic music or a dedicated burn-in-CD in repeat mode a few times (ASR Emitter volume level 20 and 30).

If you are not playing the ASR Emitter for more than a week, the same effect may occur, but not as apparent as when connected for the first time. After one or two days of listening the ASR Emitter sounds as good as the unit did before.

Tipp: if you are absent for more than three days, please disconnect all the power cords from the

AC outlet. This is the safest and cheapest way to prevent your Audio system from any damages.

To keep the Batteries in good condition please charge the battery unit at least one day a month !

Like any other high-end amplifier, the ASR Emitter sounds best about one hour after you put the left control knob to the „1“ (ON) position.

Tipp: about 1 hour before you want to listen to music, turn the ASR Emitter on.

In case you are not listening to music for more than three hours switch the ASR Emitter to standby.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

2.0

Connecting the ASR Emitter to your system

All standard inputs of the ASR Emitter are high level inputs with identical technical

characteristics, just the numbers are different.

For connection with a turntables please use a separate phono preamplifier.



The source components should be placed near to the ASR Emitter’s main unit.



To obtain the best performance please use cables as short as possible.



All audio components with high-level outputs ( minimal 200 mV AC ) can be connected.



All RCA inputs are switched in ground and signal, that avoids ground loops and influences in case more than one audio- source is connected.



If your source components are equipped with „fixed“ and „variable“ outputs always use the „fixed“ outputs to connect the component to the ASR Emitter for better performance.

ATTENTION: When you connect signal cables to the main unit please switch OFF the Emitter !

If you want to be absolutely save unplug the power cords to the AC outlet !

Tipp: please use high quality interconnects, speaker cables and power cords to connect your ASR

Emitter. The performance of your system will be increased by using the best affordable cables.

2.1.

Standard connections

In the standard version the ASR Emitter is equipped with 5 high-level inputs with RCA sockets, the Exclusive model is equipped with 4 RCA inputs and 1 balanced XLR input, both models have one direct input, one Tape output and one pair of speaker outputs as direct outputs.

Most ASR Emitter are equipped with the following RCA inputs :

„1“ = any high level source, for example for your Tuner,

„2“ = any high level source, for example for your Digital Tuner,

„3“ = any high level source, for example for your Phono–Preamplifier,

„4“ = unbalanced CD player, has WBT RCA, has the shortest signal path to the amplifier part

„5“ = balanced CD player, or D/A converters

"Dir" = Direct - should be used when you use only one signal source

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

Please connect each of your source components to one input.

Attention:

connect the right outputs of your source components to the right inputs of the

ASR Emitter and do the same for the left channel.

Please make sure that the RCA connectors fits tight in the RCA sockets at the Emitter.

2.2.

The balanced input

Most ASR Emitters are equipped with a balanced input. This input can easily be chosen by switching the input selector to the position “5”.

Each Audio component with high-level balanced outputs can be connected to the balanced inputs of the ASR Emitter.

The balanced XLR input socket his equipped with 3 hole contacts. These 3 holes are connected in the Emitter due to international Studio standards (1= Ground, 2= plus, 3 = Minus )

A balanced cable with male-/female XLR plugs can only be connected one way: the female XLR plug is connected to the source device unit component and the male XLR plug is connected to the ASR Emitter.

Tipp: in case you use a cable longer than approximately three meter between a source component and the ASR Emitter, you should better use a balanced connection. Balanced connections are from their construction less susceptible for disturbances from Radio frequencies

Balanced input impedance adjustment :

The balanced input circuit inside the ASR Emitter is equipped with 2x dip 2 pole switches.

The in total 4 dip switches can be used to adjust the input impedance of the balanced input.

When all 4 switches are Off, the impedance is 10.000 Ohms, when all 4 are On 1000 Ohms.

The 1000 Ohms position is commonly used in studios, to lower RF distortion in cables.

Please check both positions of all 4 Switches for optimal sound results.

2.3.

Connecting a high-level source to the direct input

The RCA input sockets of the direct input are connected directly to the volume control relays via silver wire, the grounding is also separately routed. The Direct input has been especially developed for audio systems with just one source component (for example a D/A converter).

The signal at the direct input does not have any input relay in signal path and separate wirings.

From this technical advantage the sound quality will be better than at the other inputs.

When you are using the direct input please switch the input selector to the 6 th Position “Dir”.

The direct input can not be switched with the input selector. If you have connected a source component to the direct input and switch the input selector to another input, where a source component is connected and playing, you will hear the signals from both inputs.

Please don`t switch the input selector to an input that has sources connected; and also never to the balanced input “5”. Otherwise the two signals will be mixed or the converter of the balanced input will suppress the signal at the direct input, and maybe also be damaged from this.

If you want to listen to other source components at the normal other inputs you have to unplug the cables at the direct input.

Attention ! When you use the direct input please switch first 30 seconds to Standby before you switch to OFF, to avoid noise from your source that is not switched OFF by an input relay.

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2.4

Input impedance adjustment

The input resistance of the Emitter can be adjusted for all inputs with 2 pieces of

4-pole Dip switches that are positioned near the tape output inside the main unit.

This unique feature has been installed to allow better sound resolution and fine tuning of the sound. Lower input resistances result in higher current at the connection cables.

What also lowers the dampening effects of the cable capacities.

The lower impedance also avoids distortions maybe coming from ground loops and radio frequency influences.

Lower input resistances result in more stable and grounded soundstage, higher impedances result in a more bright sound with less precision in lower regions.

When all Dip switches are Off,

With Dip switch No 1 to On

With Dip switch No 2 to On

With Dip switch No 3 to On

With Dip switch No 4 to On

22.000 Ohms,

10.000 Ohms,

2.000 Ohms,

1.000 Ohms,

500 Ohms,

The chosen input impedance should be selected from the output resistances of the connected sources.

Solid state outputs have low out resistances like 50 to 100 Ohms, so input resistances of 1000 or 500 are useful to be chosen.

Tube outputs have normally much higher output resistances - for this sources better choose

11.000 or 22.000 Ohms. 2000 Ohms may work at tube outputs with low output impedance.

The chosen input impedance is the same for all RCA inputs, also the direct input.

So choose the impedance to the value of the source with the highest output resistance.

2.5

The Tape Output for Tape recording or headphone amplifiers

The tape outputs are marked with “Out”. They are positioned on the rear panel, at the outer left/right side. The selected signal source is connected with this output.

The tape output can be used to connect tape recorders or for Headphone amplifiers.

2.6

Connecting a tape deck, optional monitor function

Please connect the „Line out“ or „Tape Out“-RCA sockets on your tape deck to the RCA input sockets for example „ 3“ on the ASR Emitter and the „Line In“- or „Tape In“-RCA sockets on your tape deck to the „Out“-RCA sockets on the ASR Emitter.

To make recordings, position the input selector to the source from which you want to record from.

To listen to the tape deck please chose the input to where you tape deck is connected to.

Monitor function, equalizer loop.

In case your Emitter is equipped with the optional monitor function please connect your tape deck output to the Emitter input marked with “6”. This can also be used for equalizer loops.

To listen to your records and the rear band signal during recording please push the monitor button.

With monitor option please DO NOT switch the input selector knob during a recording to input no 6. Switching to the input „6“ means switching the tape recorder in- and output together – a feedback will be the result. This feedback may cause damages to your connected speakers.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

2.7

Connecting speakers to the ASR Emitter

ATTENTION: Put the left control knob to the „Off“ position before you connect or disconnect any speaker cables. Check all speaker cables for shortcuts.

This will avoid damages to your speakers and the other connected components.

A shortcut is easily detectable and is not covered by the ASR warranty!

To increase the performance of the ASR Emitter, the standard version with a single speaker

outputs have a direct connection to the output transistors without a relay in signal path.

The direct output causes some differences to a relay-switched speaker output :



while switching the ASR Emitter On or Off, there might be an audible sound in your speakers.



To avoid damages of the amplifier , before you switch ON ASR Emitter to the

„On“-position please check the connectors of the speaker cables for correct

position and that the connectors of plus and minus are not connected together.



if a technical defect occurs, the speaker output can not be disconnected; in case of trouble, the protection circuitry shuts down the whole unit and shorts the speaker outputs.



to listen to music again, the left control knob on the ASR Emitter has to be switched OFF for some seconds to restart the operation of the amplifier.

The speakers connected to the ASR Emitter should have an impedance that

is not lower than 1,5 ohms (20Hz to 20kHz).

The speaker outputs are located on the rear panel of the ASR Emitter below the RCA input sockets.

Please connect the „minus“ (black at most speaker cables) of the right speaker cables to the

„minus“ (black) terminal on your speaker, than the other end of the cable to the right black terminal on the ASR Emitter, and the „plus“ (red) of the right speaker cables to the „plus“ (red) terminals of your speakers, than the other end of the cable to the right red terminal on the ASR

Emitter - same for the left channel.

Do not reverse „minus“ (black) and „plus“ (red) – neither on the ASR Emitter nor on your speakers.

2.8

Additionally speaker outputs or headphone for the ASR Emitter

The ASR Emitter I can be equipped with one additional speaker output.

The speaker outputs are named „A“, and „B“.

The additional speaker output on the ASR Emitter can be either selected single („A“ or „B“) or together („A“ and „B“). The chosen outputs are shown in the display on the front panel.

Every ASR Emitter can be equipped with a headset output, either on the front- or the rear panel.

The headphone is connected via a gold-plated 6,3 mm socket, for smaller ones please use an adapter. The headset output can be easily chosen by switching the left control knob to the position „2“. At units with two speaker output please use position “3”.

Two yellow leds bars in the display indicate that the headphone output is selected.

The 6,3mm-plug must not be disconnected, when the headphone is not in use.

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2.9

Connecting a subwoofer or an external main amplifier

The ASR Emitter Exclusive is equipped with an Pre- out as standard.

For the Basic model it is option.

The RCA outputs are positioned left and right near the heatsinks.

The output is marked with “sub” and can be used for active Subwoofers and as pre- out for slave main amps.

The signal at the sub is a linear fraction of the output signal and is varying depending on the volume of the Emitter.

This output provides an full band ( not filtered ) signal divided from the output stage.

Adjusting the pre- out signal

The volume at this out output can be adjusted with 2 dip switches with -6 and -12 dB, and additionally with a fine adjustable 20 gang multi turn trimmer.

Please adjust the 2 Dip switches that the volume that you subwoofer input has the lowest possible attenuation, what means the volume control at the subwoofer should be opened maximal.

Please use the same adjustment for both channels.

To get even lower output signals or for a fine adjustment in case the Emitter is used in combination with an external main amplifier without volume control you can use the additionally 0 gang multi turn trimmer.

Please check that both trimers have same adjustments.

Please adjust at first the left channel that the adjusted dampening volume is matching the needs of your main amplifier.

Then switch OFF the Emitter and measure the resistance with a digital multi-meter at the left sub- out between output and ground.

Then adjust the right channel to the same level.

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3.0

Operating the ASR Emitter

3.1

General operation of the ASR Emitter

All functions of the ASR Emitter can be controlled by the three golden or chromium knobs on the front panel of the main unit. The operation via remote control is even more convenient.

The status of the ASR Emitter is shown in the display on the front panel.

The external power supplies of the ASR Emitter are operating at low levels in energy saving mode: in this mode the output and driver have half voltages.

For a longer life of the built in parts, after switching ON the ASR Emitter is operating in the energy saving mode for one minute.

After connecting the ASR Emitter, please set the left knob to the „Standby“-position. Now you can either set the left knob to the „1“ (On)-position or use the remote control to turn the unit ON.

3.2

Front panel control knobs of the ASR Emitter

On-/Off-Selector (= left knob)

Position Function

O

Off The unit is turned off, the power to the control circuits is disconnected.

Before you switch from „Standby“ to „Off“ please wait at least 20 seconds.

The ASR Emitter needs this time, to run all functions down.

S

Standby In this position

- the ASR Emitter can be operated with the remote control

- you can record from source to tape

1

volume can be adjusted from 0 to 61dB, normal operating position, energy saving mode is active.

2

volume can be adjusted from 0 to 76dB, energy saving mode is deactivated.

Emitters with additionally outputs :

Additional positions Function

A1

(speaker-)outputs „A“, normal operating position

B1

C

A2

B2

(speaker-)outputs „B“, normal operating position. the headset-output is active, the speaker-outputs are muted

(speaker-)outputs „A“, volume control from 0 to 76dB,

(speaker-)outputs „B“, volume control from 0 to 76dB

A+B1

(speaker-)outputs „A“ and „B“ selected to play together

When the ASR Emitter is controlled via remote control, the knobs stay in position selected before in manual mode. From that the position of the left knob may not exactly correspond with the actual operating mode. This mode is shown with leds around the knobs.

The chosen input is indicated by an led above the (right) input selector knob.

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Out A

Out B

Earphone

Balance

Option 2

Overload

Overheat

Fault Monitor

Energy

Out B

Earphone

Balance

Level adj

Option 3

Overload

Overheat

Volume control (= middle knob)

The volume of the ASR Emitter is controlled with a relays step control. The middle knob works as an rotary pulse encoder and can be turned around 360°. The chosen volume will be displayed in numbers from 0 to 76. In „Standby“-mode the volume can be pre selected up to 49 – this avoids too high sound pressure levels when turning the ASR Emitter on.

Input selector (= right knob)

In the standard version of the ASR Emitter, the input selector has six positions: five high level inputs and Direct. To select an input, please move the input selector knob to the desired input.

The chosen input is indicated by a yellow led.

Monitor-switch (= if supplied, right beside the input selector knob)

As an option, the ASR Emitter can be equipped with a tape monitor switch. When the ASR

Emitter is turned ON, pressing the tape monitor switch allows you to listen to the rear band signal.

When the monitor input is activate a green bar in the display is shining. When the ASR Emitter is in the „Standby“-mode, pressing the tape-monitor switch activates the adjustments mode.(See 3.4)

3.3

Operating the ASR Emitter via ASR remote control

All functions of the ASR Emitter can be controlled via the supplied ASR remote control.

To operate the ASR Emitter via ASR remote control, switch to „S“.

When you press a key on the ASR remote control, the display lights up and shows the selected function. When using the ASR remote control, the three control knobs on the front panel of the

ASR Emitter are not moving. Leds around the knobs are showing the operation mode.

For remote control operation, the ASR Emitter uses the standard RC5 code set – this allows the remote control operation with a wide variety of different programmable remote controls.

Philips and Marantz and many other brands uses the RC5 code, too.

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Functions of the remote control buttons :

Button Function

(right side)

Power

switches the ASR Emitter ON and OFF

Mute

lowers the volume for 15dB, pressing the button again goes back to the level before

Vol

upper “Vol”-button = increases the volume lower “Vol”-button = decreases the volume

(left side)-

Mode

selects the adjust mode for balance, energy saving mode, display brightness etc. and input level. press the “Mode”-button as long until the mode you want to adjust is displayed; adjustments can now easily be made using the „Vol“ buttons

Inp

allows direct input selection: Ph, CD1, CD2, Tu, DT, Vi, Dir upper “Inp”-button = switches the inputs clockwise, lower “Inp”-button = switches the inputs counter-clockwise

3.4

Adjustments of the ASR Emitter

The ASR Emitter offers a lot of possibilities for adjustment.

With remote : The adjustment menu can be easily accessed by pressing the „Mode“- button on the ASR remote control.

At the main unit : Please switch the Emitter to Standby with the left knob to Standby.

Then push the „Tape Monitor“-button located right from the input selector.

When the ASR Emitter is not equipped with a Tape monitor the button is located at the back of the display board inside the amp at the right side. For access you have to remove the top cover.

To adjust the parameter, please press either the “Vol”-buttons on the ASR remote control or turn the middle knob on the ASR Emitter to the right (+) or left (-).

To save your individual adjustments please just wait till the adjustment mode switches Off automatically. Then all adjustments are stored into an EEprom.

Adjusting the channel balance

Please press the “Mode”-button on the remote control (or the „Tape Monitor“ on the front plate)

once – two yellow led bars „Balance“ are flashing. Now you can either use the “Vol“-buttons

(upper “Vol”-button = balance to the left, lower “Vol”-button = balance to the right ) on the

ASR remote control or the middle knob of the ASR Emitter to adjust the channel balance.

If the balance is adjusted to one side, the corresponding yellow „Balance“-led is flashing.

When the balance is in the middle both yellow „Balance“-leds are flashing.

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Adjusting the energy saving mode

The ASR Emitter switches automatically between energy and full power mode, depending on the volume level.

The volume level can be adjusted in a wide range from 01 to 51.

If you set the display to „01“ the energy saving mode is disabled. The factory setting is „35“.

Please press the “Mode”-button on the remote control (or the „Tape Monitor“-button on the front plate) twice – the green led „Energy“ is flashing.

Now please use either the “Vol“-buttons on the ASR remote control upper “Vol”-button = ASR Emitter switches into full power mode at higher level, lower “Vol”-button = ASR Emitter switches into full power mode at lower level, or the middle knob of the ASR Emitter to adjust the energy saving mode.

Adjusting the display mode and brightness

The display of the ASR Emitter can be adjusted in its brightness, and also parts of the display can be illuminated all the time or not. The actual setting is displayed numerical.

Factory setting is „07“: maximum brightness and the display is switched Off 10 seconds after the last operation at the control panel or the remote control.

The display of the ASR Emitter with Blue Display is adjusted to “37”.

In this mode the number display and the blue leds around the knobs are illuminated all the time with maximum brightness.

Please press the “Mode”-button on the ASR remote control (or the „Tape Monitor“-button on the front plate) three times – the two yellow display numbers are flashing.

Now either use the “Vol“-buttons on the ASR remote control or the middle knob of the ASR

Emitter to adjust the display.

left display number

Adjustment of the display switch ON Mode

3

4

5

6

7

0

1

2 display switches totally off after ten seconds the leds above the left and right knob are illuminated constantly the two numbers of the display are illuminated constantly equivalent to mode 1 and 2 together mode led bars (Out, Balance etc.) are illuminated constantly equivalent to mode 1 and 4 together equivalent to mode 2 and 4 together the whole display is illuminated constantly

right display number Adjustment of brightness

0 to 7

8 to F

0 (= off) to 7 (= max. brightness), altering the volume will illuminate just the yellow numbers

8 (= off) to F = (= max. brightness) altering the volume will illuminate the whole display

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Adjusting the input level

To avoid difference in volume when switching from one input to another, the input level of each input can be adjusted. The input with the lowest level (mostly a phono preamplifier or an analogue tuner) should be left unaltered and work as a reference to adjust the input level for the other high level inputs of the ASR Emitter.

Please choose the input that you want to adjust. Please press the “Mode”-button on the ASR remote control (or the „Tape Monitor“-button on the front plate) four times slowly – the yellow „Input level“-led is flashing.

Now either use the “Vol“-buttons (upper “Vol”-button = increases input level, lower “Vol”-button

= decreases input level) on the ASR remote control or the middle knob of the ASR Emitter to adjust the input level for the chosen input. For all other inputs do equal.

Adjusting the configuration of the ASR Emitter

The ASR Emitter is equipped with internal DIP switches to configure the unit. Factory setting depends on the features of the individual unit. To re-configure your ASR Emitter individually, please contact your authorized ASR Audio Systems dealer. The left and right switches are for separate adjustments and are set different left and right.

High Frequency compensation switch

The high frequency compensation of the output stages of the ASR Emitter can be increased with two pieces 4 position Dip switches on the mainboard.

Left channel Right channel

The minimal compensation you get is when all 4 switches are Off, the maximum with all 4 switches to ON. Standard is Dip No 1 to ON for a low compensation.

The higher numbers from 2 to 4 increases the compensation.

So higher the number of the Dip switched to ON so higher is the compensation.

Higher value of Compensation increases the stability with difficult loads like high-capacitive cables or impedance critical loudspeakers. The sound becomes at the same time a little bit

smoother.

By the way also the sound in the burn–in time can be chosen as more pleasant.

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4.0 Protection circuits of the ASR Emitter

Every ASR Emitter is equipped with several protection circuits to avoid any damage on the unit itself and on your loudspeakers. The ASR Emitter and the voltage supply is switched OFF, if the protection circuits detect over-temperature, offsets and/or repeated overloads during operation.

Faults during operation are indicated by a flashing red led „Fault“.

To restart the operation please put left knob to the „Off“-position for some seconds.

4.1

Offset- protection circuit

This protection switches the ASR Emitter OFF in case of an DC Offset.

Any DC offset is dangerous for the connected loudspeaker, the woofers may be damaged.

An DC offset can be caused from a source with DC offset and a malfunction of the Emitter.

In case an Offset is detect, the Emitter switches Off immediately. The display indicates the switch OFF with two flashing red led bars „Offset“, and „Fault“.

4.2

Distortion- and Overload-protection circuit

This protection switches the ASR Emitter OFF in case of overload or a missing supply voltage.

When you play so loud that the required output voltage is higher than the operational voltage of the amplifier the signal pulses are cut. This results in very high distortions that may damage the midrange- and treble drivers of your loudspeakers.

As soon as the protection circuits detects distortion, the distorted channel of the ASR Emitter is switched OFF – the display indicates the switch OFF with a flashing red led bar „Overload“.

For the first seconds of the overload the output is switched Off, the volume is lowered.

Then the Emitter is switched into energy mode to avoid damages of your speakers.

In case the Overload has a longer duration the Emitter is switched Off complete.

A shorter reaction with faster switch Off at Overload can be chosen with a dip switch.

The delay between the detection of Overload and the reaction of the Overload circuit

can be chosen with one 2 pole Dip switch per channel :

Switch 1 OFF long switch-off time ON Switch-off time short

Switch 2 OFF no influence ON No disconnection at distortion or short-circuit

When the protection circuit is switched OFF, the amplifier can no more recognise

a short circuit of the loudspeaker outputs during operation!

!! WARNING !! For this reason, this switch position should only be used in exception.

Any warranty can not be granted when the protection circuit had been switched Off.

4.3

Over-temperature protection circuit

The ASR Emitter is equipped with a sensitive over-temperature protection circuit.

Temperature sensors are located at the large heat sinks of the ASR Emitter.

In case these sensors detect a temperature higher than 55° Celsius, the volume is decreased and the ASR Emitter is at first switched to energy mode to cool down.

The display indicates the overheat with a flashing red led bar „Overheat“.

In case the temperature is still too high also after 60 seconds, the Emitter is switched OFF total.

In this case please put the left knob on the ASR Emitter’s front plate to the „Off“-position.

After the amplifier has cooled down you can switch the amplifier ON again.

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5.0 Maintenance of the ASR Emitter

5.1

Cleaning of the ASR Emitter

The standard cleaning set includes everything you need to take care of the finish of the ASR

Emitter: antistatic plastic cleaner and a special cloth. Please do not use any other cloths than the supplied one to clean the acrylic glass of the ASR Emitter.

The use of the plastic cleaner is quite simple: spray some of the liquid on the acrylic glass and spread it with the cloth. Clean the acrylic glass, wipe off the liquid and polish it with the cloth.

The knobs on the front plate are sealed and may not be cleaned with anything else than a soft cloth with no liquids or chemicals on it.

Tipp: if you are not using your equipment for a certain time cover it with a soft, fluff-free cloth – you avoid most of the soiling on your equipment.

Removal of scratches

Most of all scratches can easily be removed by using acrylic polishing paste.

Please use as specified by manufacturer. After the use of acrylic polishing paste you should use the plastic cleaner. The ASR warranty does not cover any damage caused by using any other cleaner than the supplied one.

5.2

Resetting the ASR Emitter after malfunctions

The ASR Emitter is equipped with a digital controller to control all functions of the amplifier.

If any malfunction occurs, the Emitter can be easily be resetted. Please follow these steps:

 put the left knob on the ASR Emitter to the „Off“-position and wait a least 20 seconds



switch the left knob back to the „Standby“-position



now you can switch the ASR Emitter ON again by either putting the left knob to the „1“-postion or by pressing the „On/Off“-button on the remote control

5.3

Checking fuses in the AC power supply units

When the Emitter is not working please check at first if the two red leds for input and two green leds for control are shining in the external power supplies.

If not please check if the AC cord is plugged in properly at the PSU and the AC wall plug.

If yes - please unplug the AC cord, open the PSU units and check the fuses inside.

There are two fuses in the AC power supply -



The main fuse - the big one left the PCB board (230V = 10 A slow, 115V = 16 A slow)



The small fuse in a black tube right on the Pcb Board is a 0,5 A at 230V and 1 A at 115V

When the leds in the power supply units are shining, but not in the main unit please check if the heavy silver connection cables from the main unit are connected properly to the power supply units.

At our website you can find a detailed description of the fuse exchange with pictures

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5.4

External battery power supply function and fuses

After switching on the main unit the blue Batt ON bar should light up in the front plate of the battery unit, and the Emitter main unit is supplied out of the battery.

If that does not occur, and the yellow Charge is lighting up instead the batteries are empty and should be charged. After recharging the battery unit switches automatically back into battery mode. If the charge led is not shining please check if the AC cord is plugged in properly.

Also check the fuse that can be found in the little drawer in the connector for the AC plug at the rear panel of the battery unit. Replace the fuse, when necessary with a 0,5A/230V and 1A/115V.

The batteries also have 2 fuses of 5 amps slow. The fuses are located in the black tubes at the PCB

Board near the cables from the batteries.

The batteries should be exchanged every 6 to 7 years. Old batteries have slow sound.

5.5

Remote control battery exchange

In this case the remote does not work please check at first if the Emitter is switched OFF.

In this case the remote can not work.

Then check if the led on the remote controller is flashing green when you push a button.

If not please check the battery and if necessary please exchange it.

The battery is a lithium Type 2477 that are produced from sony and renata/swiss.

Please unscrew the 4 screws at the back and open the case and put out the PCB bord.

Please be careful to hold the knobs in the top panel.

Please put out the used battery and insert the new one in the holder.

Please be sure that the new battery is inserted in the same way the used battery has been.

The put back the PCB board to the case and put the back panel into position.

5.6

Noise from the main unit while warming up/cooling down

The main unit of the ASR Emitter is assembled with acrylic glass and heat sinks of aluminium.

These two materials expand differently during the warming up/cooling off-phase of the amplifier.

This may result in some crackling noises during warming up or cooling down.

Solution : loosen the screws (located in the heat sinks) of the front- and/or rear panel

of the ASR Emitter.

5.7 Just in case: repair

If all the help we provided in this trouble-shooting-section of the manual did not help to make the ASR Emitter operate properly, please contact your authorized ASR Audio Systems dealer.

Please pack the units into the original ASR boxes and with the original ASR packing accessories.

Your authorized ASR Audio Systems dealer will take care of your unit and will repair it properly.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

6.0 Facts about the ASR Emitter

6.1 Function of the ASR Emitter main unit



Most of the design of the Emitter is totally different from other amplifiers !



The Emitter is more a main amp with volume Control and input switches.



It is not necessary to have a additionally pre-amplifier !



The internal signal-path is unbalanced, balanced signals are converted !

The signal is passing the input relays and is routed straight to the relays volume control step switch to be controlled in its level. Till level 50 the signal is attenuated, in 51 the signal goes unchanged through the volume control. From level 52 on the gain is regulated.

The amplifier has three stages :

1) In the input stage is a FET-input-operational amplifier IC.

2) The driver stage is made with very fast Mos Fet transistors.

3) The output stage is made with 2x3 (2x5 at EM II ) high power audio Mosfets.

Every stage has a separate supply voltage. Each voltage can be controlled with leds on the Emitter main board and in the separate power supplies.

A microcontroller controls the operation of the ASR Emitter. The microcontroller is programmed with the control program and can be update with newer versions.

Description of leds shining in operation

In OFF in the main unit a red led +5V for Microcontroller is shining behind the display board.

Without battery unit also the 4 red leds from input should shine.

In the power supply units two red leds for input and two green leds for Control are shining.

In Standby the two green Leds for control plus/ minus are shining, also the leds from the input selector, the 4 red ones from input and the 4 green 11 V leds near the Offset and Overload Leds.

The Battery PSU should show a yellow bar Charge at the front.

In position 1 and 2 all other operation voltages are switched ON.

The function and Position of the leds in the main unit are described in the following pages.

In the power units : In Energy mode the yellow led Energy ON in the middle and

2 yellow EGY and 2 green Driver leds are shining.

In Full power mode three blue leds Power are shining.

The Battery PSU should show a blue bar Batt On at the front.

When the corresponding leds are shining in the power supplies, but not in the main unit, please check the cable and the plug at the rear panel of the power supply units.

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The PCB board of Emitter I :

In “O” only the green +11V led in the right front and a red +5V on the additionally board in the front is shining. Without batt PSU also the input is supplied. That can be seen with 4 red leds.

In “S” the control voltages are switched ON. The yellow -11 V LED at the right side and the 4 green 11V leds at the protection circuits are shining. Also the leds at the input relay are shining.

With battery PSU the input stage is supplied with low voltage for preheating.

In “Position 1, 2” and the further positions, the amp switches ON the external PSU.

This is shown with the yellow led Energy, located left in front.

After the PSUs have switched On, the voltages for the driver and output stages are present.

4 green leds are used to show the driver voltage (+ 75 Volt),

4 yellow ones are showing the output stage supply (+ 60Volt).

In “Energy mode” the voltages are half, the 8 leds are shining low.

In “Full power mode” this 8 leds will shine brighter with the full voltage, and 4 additionally blue leds Output come up.

The Full Power mode is shown with the blue led Full, that is located left in front.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

The PCB board of Emitter II :

In “O” only the green +11V led in the right front and a red +5V on the additionally board in the front is shining. Without batt PSU also the input is supplied. That can be seen with 4 red leds.

In “S” the control voltages are switched ON. The yellow -11 V LED at the right side and the 4 green 11V leds at the protection circuits are shining. Also the leds at the input relay are shining.

In “Position 1, 2” and the further positions, the amp switches ON the external PSU.

This is shown with the yellow led Energy, located left in front.

4 green leds are used to show the driver voltage (+ 96 Volt),

4 yellow ones are showing the output stage supply (+ 78 Volt).

In “Energy mode” the voltages are half, the 8 leds are shining low.

In “Full power mode” this 8 leds will shine brighter with the full voltage, and 4 additionally blue leds Output come up.

The Full Power mode is shown with 2 blue leds Full, located left in front.

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6.2

Function of the external powersupply :

In the separate power supply units the operating voltages are generated from the AC power network voltage.

The transformers provide 8 separate voltages that are rectified and buffered.

The standby trafo is providing the voltages for the input and control and is working all the time.

All the voltages can be controlled with 12 leds in front of the main PCB board in the PSU.

The yellow led LD6 and blue led LD7 in the middle are showing energy and full power mode.

The leds LD1 to LD3 left and LD10 to LD12 right show that the voltages are present.

In Off and Standby two green Control and two red leds

Input

are shining.

After switching ON in Energy mode the yellow led Energy ON in the middle shows that the

Emitter main unit has switched ON the PSU, then the two relays in the middle RE3, RE4 are switching and then the 2 yellow EGY and two green Driver leds are shining.

After switching in Full power mode the blue led Power ON in the middle is shining,

then the 4 outer relays RE1,2,5,6 are switching ON and then two blue leds Power

will shine, and the green Driver leds will become brighter.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

6.3 Function of the external ASR battery power supply

(optional only for the ASR Emitter Exclusive versions)

The ASR Battery Power Supply contains six batteries, each 6Volts/12Ampere-hours and capacitors for buffering summing up to 400.000



F. The Fuse for the charging transformer is located in the IEC socket: 0,5A slow-blow 230V, 1A for 115V, the battery fuses are 5A slow.

All operations are controlled by an optical digital logic circuitry to avoid RF distortions.

In Off and standby the batteries are charged, till they are full., then charging is switched Off.

In Standby the input circuits of the ASR Emitter Exclusive are supplied from the charging circuitry to be preheated with +/- 10 Volts. In Operation ( Pos 1,2 ) the charging trafo is switched

Off and disconnected from the AC line via relays in both phases.

Function and description of the control leds



turned OFF (Pos „Off“): the batteries are charged. The yellow “Charge” led is shining.

When full, the green leds “Batt+Full” and “Batt-Full” are shining.



turned ON (Pos “Stby”): the unit is supplied with current out of the charging transformer, and the batteries are still charged. The red “Standby” and “10 V” leds are shining.



turned ON (Pos 1 or 2): the main unit is supplied with current out of the external battery power supply. The yellow led “Amp ON” and the blue led “Line Off” is shining.

The charging transformer is separated from the AC power line. After that the green led “Batt On” and two blue leds “Batt+On” and “Batt-On” are shining.

 during „Batt ON“-mode: the voltage is constantly monitored. When the voltage is lower than

17 Volts the batteries are empty, and the “Batt Full” leds go away. The Battery PSU switches into the charging mode- in this mode the main unit is supplied out of the charging transformer.



Also during charging the batteries the Emitter is working and you can still listen to music.



when the batteries are fully charged at 19,5 Volts, the charging transformer will be turned

Off, and the ASR Emitter Exclusive is supplied out of the batteries.



fully charged, the batteries can supply the ASR Emitter for approximately 100 hours.

To lengthen the lifetime of the batteries please turn the Emitter to the „Standby” position for

one night after approximately 2 days of playing in “1 or 2” position. In this case the batteries are not so much discharged. Lower quantity of discharging is good for the battery life.

One hour of charging is equivalent to about three hours of playing music.

The ASR Battery Power Supply should not be disconnected from the AC outlet for more than

3 weeks, otherwise the batteries may be damaged by the self-discharging of the batteries.

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

7.0

Technical Data

ASR Emitter: integrated amplifier with adjustable input sensitivity, relays step switch volume control (75dB), remote control, five high level inputs switched via relays.

Input stage with FET inputs and separate voltage stabilization, output stage with high internal feedback, output and driver stage built with complementary MOS-FETs, temperature-depended regulation of bias 400/600mA (ASR Emitter I/II), amplifier operates mostly in class A mode, no capacitors in the signal path, full DC operation with offset regulation.

PCB double-sided 2x 110µ copper-lead-tin plated, signal wires made out of pure silver and shielded, separate grounding for each channel and for signal routing and voltage supply, pcb assembly with silver solder, electrolytic and foil capacitors are installed for buffering of the operational voltages in the main unit and the external power supplies.

External power supply with 2x 700 VA (ASR Emitter I )/ power supplies with 4x 700 VA

(ASR Emitter II) rated power, with more than 1000 VA output (impulse) for each Philbert-

Mantelschnitt- transformer, separate transformers and rectifiers for positive and negative voltages (two transformers each in separated cases per channel for the ASR Emitter II).

A built-in 72 VA transformer supplies the input stages and the controls with + 15 volts.

Six relays for each power supply are used to switch the transformers in energy saving or normal power mode. The supply voltages are shown via 12 leds in the power supply unit.

The cases of the power supplies are made of heavy-duty metal for a better shielding, the main unit of the ASR Emitter is made of acrylic glass.

RMS output power at 20Hz to 20kHz, 0.1 % distortion, both channels driven:

ASR Emitter I Basic

2x 140 watts/8 ohms, 2x 250 watts/4 ohms, 2x 450 watts/2 ohms, 2x 600 watts/1 ohm

ASR Emitter I Exclusive:

2x 160 watts/8 ohms, 2x 290 watts/4 ohms, 2x 520 watts/2 ohms, 2x 700 watts/1 ohm

ASR Emitter II Basic:

2x 250 watts/8 ohms, 2x 450 watts/4 ohms, 2x 800 watts/2 ohms, 2x 1200 watts/1 ohms

ASR Emitter II Exclusive:

2x 250 watts/8 ohms, 2x 500 watts/4 ohms, 2x 900 watts/2 ohms, 2x 1400 watts/1 ohms

Dynamic output power: about 1,5x RMS output

Distortion: from 50mW to -1dB under RMS output 1kHz <0.02%, from 20Hz to 20kHz <0.1 %

Signal-to-noise-ratio: > 90dB (at 1 watt/8 ohms)

Frequency response: -0.2Hz to 500kHz (- 3dB)

Input impedance: 22 k Ohms unbalanced inputs, balanced 10 k or 1 k Ohms switchable

Gain: up to 28 dB in position „1“, up to 43dB in position „2“ depending on volume set

Input sensitivity: level „61“ = 2,0V, level „76“ = 0,4V (for 150 watts into 8 ohms)

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ASR Audio Systems Friedrich Schaefer, D- 35 745 Herborn, Germany +49 / 2772 – 42 905

Separated supplies for ( Exclusive versions )

the input stage:

+16 volts/86.000µF (ASR Emitter I) and 152.000µF (ASR Emitter II)

the voltage amplification stage:

+76 volts/42.000µF (ASR Emitter I) and + 96 volts/620.000µF (ASR Emitter II)

the current output stage:

+ 60 volts/402.000µF (ASR Emitter I) and +78 volts/602.000µF (ASR Emitter II)

Dimensions and weights: (W x D x H) of the Exclusive versions

ASR Emitter I :

42,0 x 41,0 x 18,0 cm, 22 kg, power supply 46,0 x 32,0 x 16,0 cm, 32,0 kg

16,5 x 16,1 x 7,1 inches, 48 lbs., power supply 16,9 x 15,6 x 5,9 inches, 71 lbs.

ASR Emitter II :

57,0 x 44,0 x 23,0 cm, 47 kg, two power supplies 46,0 x 32,0 x 16,0 cm/each, 32 kg/each

22,4 x 17,3 x 9,1 in,103 lbs, two power supplies 16,9 x 15,6 x 5,9 inches/each, 70,6 lbs./each

Our address :

ASR Audio Systeme Friedrich Schaefer

Hohe Straße 700, House 5A

D 35 745 Herborn / Germany

Phone +49 ( 27 72 ) 42 905

Fax +49 ( 27 72 ) 40 488

E- Mail : [email protected]

Internet : http://www.ASRAudio.com

Note:

ASR Audio Systems reserves the right to change specifications without notice as design improvements are incorporated.

Copyright Okotober 2016 Friedrich Schaefer, ASR Audio

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