Parasound 2125 Stereo Amplifier Operating instructions

Power

Protect L R Hi Temp

M o d e l 2 1 2 5 T w o C h a n n e l A m p l i f i e r

A B

OWNER’S GUIDE

IMPORTANT SAFETY INSTRUCTIONS

The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of “dangerous voltage” inside the product that may constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance instructions in the literature accompanying the product.

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

1.

Read Instructions — Read all the safety and operating instructions before operating this product.

2.

Retain Instructions — Retain safety and operating instructions for future reference.

3.

Heed Warnings — Adhere to all warnings on the product and in the operating instructions.

4.

Follow Instructions — Follow all operating and use instructions.

5.

Cleaning — Unplug this product from the wall outlet before cleaning. Use a damp cloth for cleaning.

Clean the outside of the product only.

6. Attachments — Do not use attachments that are not recommended by the product manufacturer; they may be hazardous.

7.

Water and Moisture — Do not use this product near water.

8.

Accessories — Do not place this product on an unstable cart or stand. The product may fall, causing bodily injury and damage to the product. A product and cart combination should be moved with care.

Quick stops, excessive force, and uneven surfaces may cause the product and cart to overturn.

9.

Ventilation — Slots and openings in the cabinet are provided for ventilation to ensure reliable operation of the product and to protect it from overheating. These openings must not be blocked or covered. This product should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided.

10. Power Sources — Operate this product only from the type of power source indicated on the label.

If you are not sure of the type of power supply to your home, consult your dealer or local power company. This product is equipped with a three-prong grounding plug. This plug will only fit into a grounding power outlet. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding plug.

11. Power Cord Protection — Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them.

12.

Lightning — Unplug the unit from the wall outlet for added protection during a lightning storm and when it is left unattended and unused for long periods of time. This will prevent damage to the product due to lightning and power line surges.

13.

Overloading — Do not overload wall outlets or extension cords. This can result in a fire or electric shock.

14.

Inserting Objects into Unit — Never push objects of any kind into this product through any openings; they may touch dangerous voltage points or short out parts that could result in fire or electric shock.

15. Servicing — Do not attempt to repair or service this product yourself. Opening or removing covers may expose you to dangerous voltage and other hazards. Refer all servicing to qualified service personnel.

16.

Damage Requiring Service — Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions: a) If the power-supply cord or plug is damaged.

b) If liquid has been spilled into the product. c) If the product has been exposed to rain or water. d)

If the product does not operate normally by following the operating instructions. e) If the product has been dropped or damaged in any way.

f) If the product exhibits a distinct change in performance.

17.

Replacement Parts — When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer. Unauthorized substitutions may result in fire, electric shock, and other hazards.

19.

Safety Check — Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition.

20. Wall or Ceiling Mounting — Mount the product to a wall or ceiling only as recommended.

21. Heat — The product should be situated away from heat sources such as radiators, heat registers, stoves, and other products (including amplifiers) that produce heat.

www.parasound.com

TABLE OF CONTENTS

Unpacking and Accessories

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

115v – 230v AC Selector Switch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Ventilation Requirements

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Rack Mounting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Rear Panel Connections and Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input and Loop Out Jacks

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Level Knobs

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

High Pass Filter Switch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Speaker Connections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bridging Switch: Stereo - Mono

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mono Input

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Speaker Connections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Load Impedance Switch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Auto Turn On

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sensitivity Adjust Knob

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ground Switch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

8

8

6

6

6

4

4

4

4

5

5

Front Panel Power Button and Speaker Buttons

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

Front Panel Status Indicators

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

Typical Problems and Remedies

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

Are You Having Difficulty?

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

Warranty Repair

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

Connection and Setup Notes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13

1

2

INTRODUCTION

Congratulations and thank you for your purchase of this precision Parasound audio component.

The Parasound Model 2125 is the latest generation of popular and proven audio power amplifiers dating back to 1981. It has been designed for a wide variety of applications, establishing a new standard for audio performance, user-friendliness and utility in custom installations.

The versatility of the Model 2125 allows many connection and configuration options, so please be sure to read this manual thoroughly before you begin installation.

Unpacking

Carefully unpack your Model 2125 and these accessories:

•

Detachable AC power cord

•

Trigger wire with a 2.5 mm sub-mini plug at both ends

•

Trigger wire adapter for a 3.5mm mini jack

Please inspect the unit now and contact your Parasound Dealer promptly if you see evidence of shipping damage. Save the carton and packing inserts in case you move or in the event you need to ship your amplifier for repair. Before you proceed, locate the serial number on the rear panel or underside of the unit and record it here for future reference:

OWNERSHIP REFERENCE INFORMATION

Parasound Serial Number:

Date of Purchase:

Name of Dealer:

/ /

Dealer Street Address:

Dealer Phone: ( ) -

2125 Two Channel Amplifier

Parasound Products, Inc.

San Francisco, CA U S A

Manual

Auto Turn On

Audio Sens 12V Trigger

In Loop

Audio 12V Max Min

Ground

Lift Norm

Input Loop

L

Level

High Pass Filter

THX

Flat 20Hz 40Hz

R

Mono

THX

Stereo

Mono

Bridging

CAUTION

To Prevent Electric Shock, Do Not

Remove Cover. No User-Serviceable

Parts Inside. Refer Servicing To

Qualified Service Personnel.

R

Speaker Pair A

L

Mono

WARNING

To Prevent Fire Or Shock Hazard,

Do Not Expose This Unit To Rain

Or Moisture.

R

Speaker Pair B

L

Mono

AC VOLTAGE, INSTALLATION AND RACK MOUNTING

THX and Ultra2 are trademarks of THX Ltd.

which may be registered in some jurisdictions.

All right reserved.

115v - 230v AC Voltage Selector Switch

This switch is found on the chassis rear panel. The 115V position of this switch is correct for

North America; most other regions require setting it to 230V. Make sure the 115/230V switch is set for the correct AC line (mains) voltage before you connect the Model 2125’s power cord and before you install it. The unit may be seriously damaged if this switch is set incorrectly.

Protective Cover

Power Consumption: 550W

Load

Impedance

AC

Voltage

3

2-3

Ohms

4-8

Ohms

115V

60Hz

230V

50Hz

AC 115V/60Hz

AC 230V/50Hz

Installation and Ventilation Requirements

Install your Model 2125 away from heat sources such as heating ducts, radiators, or other heat producing components. Always position it horizontally.

Observe the following ventilation guidelines when installing the Model 2125 in an equipment rack or any other enclosed space:

You should never install the Model 2125 in an unventilated equipment cabinet or compartment because hot air will not exhaust adequately to prevent overheating. Air won’t often circulate adequately in a cabinet or enclosure whose front and back sides are open; pockets of intense heat can still develop around any heat-producing equipment. Therefore, a ventilation fan is highly recommended. Allow a few inches of empty space on each side and above the unit and try to avoid crowding or stacking the Model 2125 tightly between other components. A ventilation fan is also recommended where other equipment must be mounted close to the Model 2125.

Do not place the unit on carpeting or any other material that could obstruct air flow into the ventilation holes in its chassis bottom.

Rack Mounting

The Model 2125 front panel occupies only two rack spaces in a standard 19

”

equipment rack.

For rack mounting, you’ll need to use the Parasound RMK22 rack mounting kit (purchased separately). We recommend that you use the 8 insulated shoulder washers with the four mounting bolts which are included with the RMK22. Position these washers on both sides so they “sandwich” the front panel before the mounting bolts are screwed into the rack rail.

This will eliminate metal-to-metal contact between the Model 2125 chassis, the equipment rack, and the other components in the rack.

4

REAR PANEL CONNECTIONS AND CONTROLS

Connection Precautions

Disconnect the AC cord before making or changing any input, trigger, or speaker wire connections.

Make sure there is no strain or tension on any wires that could cause them to pull loose.




Manual

Auto Turn On


In Loop


Ground

Lift Norm

Input Loop

L

Level


THX

Flat 20Hz 40Hz

R

Mono

THX

Stereo

Mono

Bridging

CAUTION





R

Speaker Pair A

L

Mono

WARNING



Or Moisture.

R

Speaker Pair B

L

Mono

Load

Impedance

2-3

Ohms

4-8

Ohms

AC

Voltage

115V

60Hz

230V

50Hz



All right reserved.


AC 115V/60Hz

AC 230V/50Hz




Manual

Auto Turn On


In Loop


In Jacks

to the Model 2125’s L and R audio Input jacks. Use only the R channel jack for mono operation.

Loop Jacks



The jacks replicate the audio input signals to facilitate connections of other power amplifiers to the same preamplifier or system controller. Loop connection of multiple power amplifiers is called a “daisy chain.”

Note: You may loop the trigger connections of multiple Parasound power amplifiers without overloading the surround controller or preamplifier trigger outputs.

Input Loop Level

Speaker Pair A


R

L

THX

Ground

Flat 20Hz 40Hz

Lift Norm

R

Mono

Stereo Mono

Bridging

Mono

THX

R (Right) and L (Left) Level Knobs

You can adjust the listening level for each channel by turning its Level knob clockwise to increase gain or counter-clockwise to reduce gain. The maximum settings correspond to THX

Reference Level where the gain is 29: 1 volt at the input jacks corresponds to a 28.28 volts at the speaker terminals. THX recommends this setting whenever the 2125 is installed with other

THX-certified components.

L

surround controller and on the Model 2125 to find a combination of gain settings where your system’s background noise is lowest. Sound professionals call these adjustments “gain staging.”

WARNING



Or Moisture.

R

Speaker Pair B

L

Mono

Load

Impedance

2-3

Ohms

4-8

Ohms

AC

Voltage

115V

60Hz

230V

50Hz



All right reserved.


AC 115V/60Hz

AC 230V/50Hz




Manual

Auto Turn On


In Loop


Ground

Lift Norm




Manual

Auto Turn On


In Loop


Ground

Lift Norm

Input

Input

Loop Level

CAUTION

REAR PANEL CONNECTIONS AND CONTROLS continued



High Pass Filter Switch

The High Pass filter can improve the sound in virtually any installation. It’s called a “high pass” filter because it permits signals higher than 20 Hz and 40 Hz to pass, while preventing signals below these frequencies from passing.

Speaker Pair A


R

L

R

L

THX

Flat 20Hz 40Hz

R

Mono

Stereo

Mono

Bridging

Mono

THX

•

The Flat switch position disconnects the filter and the 2125’s frequency response is flat.

•

The 20 Hz switch position filters out frequencies below 20 Hz. Your speakers have greater dynamic range and far less distortion when they don’t receive frequencies which are lower than they can reproduce. Likewise, the 2125 operates more efficiently when it’s not called upon to amplify frequencies which the speakers can’t reproduce. Because the 20 Hz filter has a steep

18 dB per octave slope, it is essentially a sub-sonic filter, and you probably won’t notice any loss of bass unless you’re using very large speakers.

•

The 40 Hz switch position filters bass below 40 Hz at 18 dB per octave. This is ideal when the

275 is driving in-wall or in-ceiling speakers because very few of them can reproduce very much bass below 40 Hz. You’ll enjoy much cleaner sound and higher undistorted volume levels. Not having to amplify bass that’s inaudible with your speakers is another way the 275 will run cooler.

Loop

L

amplifier malfunction. The 20 Hz or 40 Hz filter settings enable the 275 to drive them with ease.

Level

THX

Speaker Connections

There are separate speaker terminals for two pairs of speakers, labeled Speaker Pair A and

Speaker Pair B.



Or Moisture.

Each - and + speaker terminal will accept bare speaker wire up to AWG 12, a wire terminated with a

1

⁄

1

⁄

4

spade lug, or with a single banana plug; dual banana plugs which are may be used for each speaker.

3

⁄

4

(19mm) apart

Speaker Pair A Speaker Pair B


R

L

R

L

Flat 20Hz 40Hz

Load

Impedance

R

Mono

THX

Stereo

Mono

Bridging

Mono

If you use bare wires, remove only enough insulation, about

1

⁄

1

⁄ ⁄ ”

Mono

2-3

Ohms

(12mm) for each exposed bare wire to insert through the small hole in the side of the binding post. Before inserting a bare wire, twist the strands tightly between your fingers to prevent strays that might touch the chassis or another terminal and cause a short circuit. If you have soldering experience you may want to “tin” the stripped bare wire with solder for a cleaner termination and to prevent the wire from oxidizing.

4-8

Ohms

WARNING


Or Moisture.

Speaker Pair B

Mono

AC

Voltage

115V

60Hz

230V

50Hz

L



All right reserved.


AC 115V/60Hz

AC 230V/50Hz

Load

Impedance

2-3

Ohms

4-8

Ohms

AC

Voltage

115V

60Hz

230V

50Hz



All right reserved.


AC 115V/60Hz

AC 230V/50Hz




Manual

Auto Turn On


In Loop


Ground

Lift Norm

Input Loop

L

Level


THX

Flat 20Hz 40Hz

R

Mono

THX

Stereo

Mono

Bridging

6


Correct Speaker Polarity is Important

As you connect the speaker wires, you can see that the insulation on one of the two wires in each pair has either printing or a raised ridge. The marking lets you know which wire you con-

CAUTION

Audio 12V





R

Speaker Pair A




Manual

L

Auto Turn On


In Loop

Max Min

Ground

Lift Norm

R

Input

WARNING



Or Moisture.

Speaker Pair B

Loop

L

L

R

Mono

Level

Make sure the + wire you attach to each Model 2125 + speaker terminal is attached to the + terminal of the speaker for that channel.

Bridging Switch: Stereo - Mono



The Model 2125 power should always be turned off before moving this switch.

For normal operation the Bridging switch must be set to Stereo.

THX

For bridged mono operation, set it to Mono.

Note: Stereo sound will be faint and very distorted if you accidentally leave the Bridging switch in its Mono position.

Speaker Pair A


Flat 20Hz 40Hz

Stereo

Mono

Bridging

L

We recommend an 8 ohm minimum speaker load for bridged mono operation. For mono the Model 2125 “bridges” the R channel to amplify only the positive half of the audio signal and the L channel to amplify only the negative half of the audio signal. In effect, each channel “sees” only half of the speaker’s rated impedance, so that an 8 ohm speaker in bridged mono is only a 4 ohm load and a 4 ohm speaker in mono is only a 2 ohm load. This is why the mono power output is much higher than the sum of the L and R channel outputs for stereo operation.

THX

Mono Input and Speaker Connections

1. Turn the unit off and remove the AC cord.

2. Connect the single cable from the preamp or controller to the R channel Input jack.

3. Set the Bridging switch to its Mono position.

4. Connect the positive lead of the speaker wire to the red R + channel speaker pair A terminal.

5. Connect the negative lead of the speaker wire to the red L + channel speaker pair A terminal.


6. Do not connect anything to either the L - or R - speaker terminals.

All right reserved.

7. If you have a second mono speaker repeat steps 4 - 6 with the speaker pair B terminals

8. Reconnect the AC cord.

Note: The Model 2125 creates more heat when it drives a bridged mono speaker or multiple speaker pairs. Lower impedance speakers will make it run even hotter. Heat greatly reduces

Load Impedance switch to avoid overheating.

Load Impedance Switch

Load

Impedance

AC

Voltage

R

WARNING



Or Moisture.

Speaker Pair B

Mono

L

Mono Mono

2-3

Ohms

4-8

Ohms

115V

60Hz

230V

50Hz

AC 115V/60Hz

AC 230V/50Hz

Load

Impedance

2-3

Ohms

4-8

Ohms

AC

Voltage

115V

60Hz

230V

50Hz



All right reserved.


AC 115V/60Hz

AC 230V/50Hz


For a single pair of 4 ohm or 8 ohm speakers the Load Impedance switch may be set to its 4-8

Ohms position. The Load Impedance Switch must be set to 2-3 ohms whenever the load will be lower than 4 ohms. Speaker loads below 4 ohms impedance can cause the Model 2125 to overheat rapidly and cause audible distortion. These are examples that require the 2-3 ohms setting.

1. Driving two pairs of speakers whose impedances you don’t know.

2. Driving two pairs of speakers with impedances that are lower than 8 ohms. Two pairs of 4 ohm speakers driven simultaneously are a 2 ohm load.

3. Driving a single 4 ohm speaker bridged to mono. This is a 2 ohm load.

4. Driving two 8 ohm speakers bridged to mono. This is a 2 ohm load.

Note: For the coolest possible operating temperature we recommend setting the Load

Impedance switch to 2-3 ohms even if you are using a single pair of 8 ohm speakers.

Automatic Turn On and Off

Auto Turn On Switch

For convenience, there are two ways the Model 2125 can be triggered to turn on automatically.

•

When a suitable voltage is applied to its 12V In (input) jack.

•

When an audio signal is present at the L and R audio Input jacks.

Note: When either automatic turn on method is selected the Model 2125 front panel Power button is disabled so that on/off is determined solely by the triggering preamp or system controller.

12V Position

When the Auto Turn On switch is set to its 12V position, the Model 2125 is turned on and off with an external +9V to +12V voltage from your preamp or controller. When the external voltage ceases the Model 2125 will turn off immediately. The 12V switch position disables the front panel Power button.

Man (Manual) Position

When the Auto Turn On switch is in its MAN (manual) position, the auto turn on function is disabled and the Model 2125 must be turned on and off manually with the Power button on its front panel.

Audio Position

When the Auto Turn On switch is set to its Audio position, the Model 2125 will be turned on whenever an audio signal is present at its Left and Right Input jacks. After the audio signals cease the Model 2125 remains on for about ten minutes. This prevents unintended turn-off during pauses in your music or movies. The Audio position of the Auto Turn On switch also disables the front panel Power button.

Note: You will achieve more consistent auto turn on operation by using the 12V DC trigger if the

Model 2125 is driving the surround, center, or rear channels. At the beginning of films the surround channel levels are even lower than the minimum level required by the Audio sensing circuit.

12V In Jack

The Model 2125 12V input uses a 2.5mm sub-mini jack. To trigger the Model 2125, insert the plug at one end of the provided trigger wire into this jack and the other plug at the other end into the source component’s trigger output jack.

Some components, including most Parasound Surround Controllers, may use a 3.5mm mini jack for trigger output, so we have also included a included a 2.5mm jack - 3.5mm plug adapter for your convenience.

7




CAUTION





WARNING



Or Moisture.



All right reserved.

8

Level


L

Manual

Auto Turn On


In Loop


Ground

Lift Norm

R

Mono

THX

Flat 20Hz 40Hz

THX

Stereo Mono

Bridging

Note: If the controller’s trigger output is a + and - terminal, you can cut the 2.5mm plug off one end of the included trigger wire and attach the bare wires to these terminals. The lead with the white stripe on it corresponds to the plug’s tip and the unmarked lead corresponds to the sleeve of the plug.

Note: If the trigger voltage source is DC, the trigger plug tip must be + (positive) and its sleeve - (negative).

12V Out Jack

The Trigger Out jack lets you loop or “daisy-chain” the incoming trigger voltage to an additional

Model 2125 or other component.

Note: The Model 2125 trigger circuit draws a negligible 15 mA from the controller. The total load on your controller’s trigger output(s) is the sum of the trigger current drawn by each of the components you’ve looped together. Controllers can typically supply 150 mA at their trigger outputs.

Manual

Audio 12V

Audio Trigger Sens (Sensitivity) Knob

The Auto Turn On Audio Sensitivity knob adjusts the incoming audio level or the “threshold” required to turn on the Model 2125. Its 12 o’clock position will be suitable in most cases. To increase sensitivity for response to lower level audio signals, turn the knob counter-clockwise toward +.

Turn the knob clockwise toward - to decrease its sensitivity. This will prevent spurious noise and switching transients in your system from false-triggering the Model 2125.

Note: Plugging in the 2125’s AC cord for the first time will usually create an internal power surge that “false triggers” its Audio auto turn on, even if there’s no audio signal at its input


Ground Switch

Ground is the normal position for this switch. If you hear background hum in the speakers connected to the Model 2125, try setting the Ground Lift Switch to its Lift position. The Ground

Switch disconnects or “lifts” the audio circuit ground from the chassis ground. This often helps to eliminate audible hum that results from ground loops. Ground loops are multiple ground

CAUTION





Speaker Pair A

various AC cords.

R

L

L

Auto Turn On

Audio Sens 12V Trigger Ground

THX

Flat 20Hz 40Hz

Max Min

In Loop

Lift Norm

R

Mono

THX

Stereo

Mono

Bridging

Mono

AC Power Connections and AC Grounding

If possible, plug your Model 2125 into the same AC outlet that your accompanying audio components (especially then preamp or system controller) are plugged into. The ground potential between different AC outlets may be higher or lower, resulting in audible hum.

R

Speaker Pair A

Mono

R

L

WARNING



Or Moisture.

Speaker Pair B

Mono

L

R

Speaker Pair B

Mono

Load

Impedance

2-3

Ohms

4-8

Ohms

L

AC

Voltage

115V

60Hz

230V

50Hz

Load

Impedance

2-3

Ohms

4-8

Ohms

AC

Voltage

115V

60Hz

230V

50Hz



All right reserved.


AC 115V/60Hz

AC 230V/50Hz


AC 115V/60Hz

AC 230V/50Hz

Power

FRONT PANEL BUTTONS AND DISPLAY

Power Button

Press the Power button once to turn the Model 2125 on, press it again to turn it off.

The Power button is inoperative when the Auto Turn On switch is set to Audio or 12V.

Note: It is normal for the 2125 Protect indicator to flash briefly right after turn on.

Protect L R Hi Temp

A B

These buttons turn on the speaker pairs connected to the corresponding Speaker Pair A and B terminals. They will also select two single mono speakers. switching. The contacts in the relays will last longer if you don’t press the A and B buttons to turn speaker pairs on and off while the 2125 is playing at high volume.

Protect Indicator

The Protect indicator will illuminate red if the Model 2125 experiences an external fault condition and the unit will stop playing. This prevents possible damage to the unit from continued operation. Examples of external fault conditions are short circuited speaker wires, excessive heat, and trying to drive too many speakers at high levels.

If Protect is illuminated you need to locate and correct the fault; for example, remove the short circuit, let the unit cool down, check the load impedance and the setting of the Load Impedance switch, lower the volume level. To reset the protection circuit you need to turn the unit off.

Turning it off:

•

Auto Turn On switch (on the rear panel) in the Man position: press the Power button on the front panel.

•

Auto Turn On switch in the 12V position: turn off the 12V trigger source; the 2125 will turn itself off right away. You can also turn it off by unplugging its AC power cord.

•

Auto Turn On switch in the Audio position: turn off the preamplifier, surround controller or system controller that drives your 2125. You can also unplug the 2125’s AC power cord.

Note: It requires approximately 15 minutes after removing the audio source before the 2125 turns itself off. If you don’t want to wait and you have access to its AC cord, simply unplug it.

Leave it off and/or unplugged for awhile to cool down and you’re confident the fault is corrected. If you unplugged its AC power cord to turn it off, plug it in again.

Hi-Temp Indicator

Hi-Temp will illuminate red when the Model 2125 exceeds its maximum safe operating temperature. If the heat persists, the unit will activate its protection circuit and stop playing. It will remain in this protection mode until the temperature drops and the unit is turned off to reset its protection circuit. Use the same turn-off procedure as above. If Hi-Temp appears, it’s likely the unit is been over-driven at too high a listening level or is attempting to drive a speaker load impedance that is too low. It’s probable the unit has not been provided with sufficient ventilation. These conditions must be corrected before turning it on again to resume operation.

L and R Channel Status Indicators

L and R will illuminate green when the Model 2125 power is on and it is operating normally.

The L indicator will not light if a fault is only in the left channel; the R indicator will not light if a fault is only in the right channel. Neither L or R indicators will illuminate if there is a general fault or if the temperature is too high.

9

10

PROBLEMS AND REMEDIES

Maintaining Your Model 2125

Your Parasound Model 2125 power amplifier requires no periodic maintenance other than the knowledge that you are bragging about it to your friends. It has no user-serviceable parts inside.

To avoid the risk of electric shock, do not remove its top cover. The exterior can be cleaned with a soft cloth pre-moistened only with a few drops of water or glass cleaner.

Troubleshooting

No sound

•

Check that AC is live.

•

Is the unit on? Check the setting of the Auto Turn On switch.

•

Doesn’t turn on with the Auto Turn On - Audio. Try the 12V trigger instead.

•

Check that input cables and speaker wires are secure at both ends.

•

Make sure the control preamp/receiver is switched to the correct input.

•

If using Auto turn on, increase the sensitivity of the audio trigger.

•

Is the Hi-Temp or Protect (or both) illuminated? Check for excessive temperature, short circuited speaker wires, low impedance speaker load, and inadequate ventilation to remove heat.

Background Hum

•

Move the Ground switch to Lift.

•

Move audio cables and AC cords away from each other.

•

Try different routes for the audio cables and AC cords.

•

Make sure insulating shoulder washers are used if unit is rack mounted.

•

Try reversing the direction of each other component’s AC plug, one by one.

Overheating

•

Remove any external sources of heat.

•

Increase ventilation around the Model 2125.

•

Reset the Load Impedance switch to 2-3 Ohms.

IF YOU REQUIRE ASSISTANCE

Call your Parasound dealer first. If the dealer can’t help you with your problem we encourage you to call Parasound’s Technical Service Department, toll-free at

1-866-770-8324, Monday

- Friday, 8am - 4pm Pacific time. We can suggest other diagnostic tests you can easily perform. If we determine that your Model 2125 should be returned to Parasound or an Authorized

Parasound Warranty Center for inspection and possible servicing, we will provide the location of a warranty center near you or shipping instructions and a Return Authorization number for its return to Parasound.

Before You Return Any Unit to Parasound for Service

Before you send your unit to Parasound, you will need to obtain a specific Return Authorization

(RA) number and shipping instructions from Parasound’s Technical Department. The RA number must be clearly marked on the outer carton. Use the original factory packing materials and arrange adequate insurance to cover its value. You must include a copy of your purchase receipt, since this document establishes the validity of this unit’s warranty. Warranty repairs are only performed by Parasound or Parasound Authorized warranty centers when your purchase receipt is from a Parasound Authorized Dealer or Parasound Authorized Reseller.

Units Will Be Refused by Parasound Under the Following Conditions

1. Unit was sent without the Parasound-assigned RA number marked on the carton.

2. Unit was sent in an unsuitable shipping carton, likely to have been damaged in transit.

3. Unit has inadequate packing, unit likely to have been damaged in transit.

4. Unit was shipped collect for shipping charges. We do not accept collect shipments.

5. Unit was shipped via the US Postal Service.

6. Unit was sent to an address other than the address instructed by our Technical Department.

Note: The shipping address is not the same as Parasound’s office address.

Warranty Repair

Read your accompanying Parasound Limited Warranty carefully to understand the applicable rights and limitations. This section provides instructions for obtaining repairs, both for units covered under the Parasound Limited Warranty and for units or situations which are outside the Warranty.

Unit is not eligible for repair under the terms of the Parasound warranty if:

1. Unit was not purchased from a Parasound Authorized Dealer or Parasound Authorized Reseller.

2. You are not the original owner. The warranty is not transferable.

3. Unit’s serial number was removed, modified, or defaced.

4. Unit shows evidence of abuse and/or misuse.

5. Unit was modified in any way.

6. A prior repair was attempted by an unauthorized repair station.

11

12

PARASOUND MODEL 2125 SPECIFICATIONS

Continuous RMS Power Output

20 Hz – 20 kHz, Both Channels Driven

125 watts x 2, 8 Ω

200 watts x 2, 4 Ω

200 watts x 2, 2 Ω

Continuous RMS Power Output

20 Hz – 20 kHz, Bridged Mono

400 watts, 8 Ω

400 watts, 4 Ω

Current Capacity

35 amps peak per channel

Frequency Response

20 Hz - 50 kHz, +0/-3 dB, 1 watt

Dynamic Headroom

1.3 dB

Total Harmonic Distortion

0.025% at full rated output

0.015% at average listening levels

IM Distortion

0.05 %

Transient IM Distortion

Not measurable

S/N Ratio

114 dB at rated output, IHF A-weighted

106 dB at rated output, unweighted

93 dB at 2.828 V output, IHF A-weighted

84 dB at 2.828 V output, unweighted

Input Impedance

33 k Ω

Input Sensitivity

1 V in for 28.28 V out, THX standard

Inter-Channel Crosstalk

85 dB, 1 kHz

73 dB, 10 kHz

67 dB, 20 kHz

Damping Factor

Over 150 at 20 Hz

Auto Turn On – DC

9 – 12V, 15 mA

Auto Turn On – Audio

1.2 mV – 12 mV, adjustable

15 minute turn off delay

AC Power Requirement

110 - 120 V / 220 -240 V, 50 - 60 Hz

3 watts standby; 550 watts full output

Dimensions

17

1

⁄

1

⁄

4

Wide

16

”

Deep with connectors

4

1

⁄ ⁄ ⁄

4

High with feet, 3

1

⁄ ⁄ ⁄

2

panel only

437 x 406 x 107mm, 88.2mm panel only

Net Weight

27 lbs , 12.3 kg

Rack Mount Accessory

May be Purchased Separately

RMK22

Before any home theatre component can be THX Ultra2 certified, it must pass a rigorous series of quality and performance tests. Only then can a product feature the THX Ultra2 logo, which is your guarantee that the

Home Theatre products you purchase will give you superb performance for many years to come. THX Ultra2 requirements cover every aspect of the product including performance and operation.

THX and Ultra2 are trademarks of THX Ltd. which may be registered in some jurisdictions. All rights reserved.

CONNECTION AND SETUP NOTES

Notes:

13

We invite you to visit www.parasound.com for the most up-to-date information on your unit and to find out about other Parasound products. Learn why

Parasound has been a quality and value favorite of magazine reviewers, sound professionals and listeners like you since we were founded in 1981.

rev 0.91

Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111

Customer Service 415-397-7100 / Technical Dept. 415-675-7272 / Fax 415-397-0144

www.parasound.com

©2005 Parasound Products, Inc.