Schertler David Acoustic Combo Amplifier User manual

DAVID
combo amplifier
for acoustic instruments
IMPORTANT SAFETY INSTRUCTIONS
THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER
TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” WITHIN THE PRODUCT ENCLOSURE THAT MAY BE OF A
SUFFICIENT MAGNITUDE TO CONSITUTE A RISK OF ELECTRIC SHOCK TO PERSONS.
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.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK
DO NOT EXPOSE THE APPLIANCE TO RAIN OR HUMIDITY
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ampli�ers)
that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong
are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
10) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11) Only use attachments/accessories specified by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When
a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13) Unplug this apparatus during lightning storms or when unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
INTRODUCTION
DAVID becomes the second member of Schertler's "next generation" acoustic amplifier series. This newly-designed 3-channel amp, combines a wealth of
new features and updated technology with a new "look".
DAVID's inputs will accommodate a microphone, an instrument and a stereo device such as a computer, MP3 player or CD. The instrument input and the
Jack input on the microphone channel both feature a Bootstrap technology that enables the input to automatically adapt to any impedance.
Some of the new DAVID amplifier's new features include: three channels, a range of controls including gain, switchable resonance (notch) filter,
adjustable DI Out in the master section, mute switch and overload LED for each channel. A new digital reverb replaces the spring one found in the
original David models.
DAVID is also equipped with a high voltage CLASS-A preamp that has no integrated circuits and No Negative Feedback (NFB).
1. FRONT PANEL INSTRUMENT IN
1.1.
1.4.
1.2.
1.3.
1.5.
1.6.
1.7.
1.8.
1.1. INSTRUMENT IN
Unbalanced input for the connection of jacks (6.3mm or 1/4”), with optimal sensitivity for high level signals, the electronics will adapt to any situation.
No special action is required.
1.2. 10V
Phantom power supplies the Jack connector with 10V for powering electret microphones.
1.3. GAIN
This variable gain preamplifier adjusts the sensitivity level to ensure the best possible processing of the STAT signal through the channel.
It is important that this input level should be set and optimised in the best way to achieve the cleanest sound possible.
1.4. OVERLOAD
This LED (when lit) indicates that the level of the inputsignal is too high so it might introduce distortions
1.5. WARM
When engaged, this low-pass filter damps higher frequencies to produce a warmer sound when using bridge-mounted pickups such as the
SCHERTLER STAT-Series transducers for violin, viola, cello and double bass..
1.6. HIGH, MID, LOW
These controls are devoted to high, medium and low frequency regulation. Offering cut and boost of ±15dB, they allow a wide range of tonal
variations to be explored. When the controls are positioned centrally there is no cut or boost of the selected frequency band.
1.7. REVERB
This rotatory control sets the level of the digital reverb on the channels.
1.8. VOLUME
This rotatory control regulates the channel volume
2. FRONT PANEL MIC or INSTRUMENT IN
2.1.
2.2.
2.11.
2.3. 2.4.
2.5.
2.6.
2.7.
2.8.
2.9.
2.10.
2.1. MIC INPUT
This input is electronically balanced for XLR type connections. The new MIC/DYN channel is now conceived for any kind of signal sources. You can plug in
vocal microphones. The electronics will adapt to any situation. No special action is required.
2.2. INSTRUMENT IN
Unbalanced input for the connection of jacks (6.3mm or 1/4”), with optimal sensitivity for high level signals, The electronics will adapt to any situation.
No special action is required.
2.3. P24
The amplifier's XLR input provides 24V phantom power for use with a condenser microphone. Most condenser (and dynamic) microphones, along with
some preamps, can be safely phantom powered. In certain cases however, phantom power can cause damage to a device.
This tends to occur with unbalanced microphones, preamps or stompboxes that have been modified for balanced XLR use.
For any doubt, please contact us to check the compatibility of your audio device before using the amplifier
2.4. 10V
Phantom power supplies the Jack connector with 10V for powering electret microphones.
2.5. GAIN
This variable gain preamplifier adjusts the sensitivity level to ensure the best possible processing of the MIC and the STAT-IN signal through the channel.
It is important that this input level should be set and optimised in the best way to achieve the cleanest sound possible.
2.6. RESON
The Resonance (notch) filter cuts the frequncy of 150Hz/240Hz, to reduce low-frequncy feedback. Left: no attenuation (flat), Right: maximum
attenuation. Use the reson switch to select the resonant frequency of the instrument (240Hz/150Hz)
2.7. RESON switch
2.8. HIGH, MID, LOW
These controls are devoted to high, medium and low frequency regulation. Offering cut and boost of ±15dB, they allow a wide range of tonal
variations to be explored. When the controls are positioned centrally there is no cut or boost of the selected frequency band.
2.9. REVERB
This rotatory control sets the level of the digital reverb on the channels.
2.10. VOLUME
This rotatory control regulates the channel volume
2.11. OVERLOAD
This LED (when lit) indicates that the level of the inputsignal is too high so it might introduce distortions
3. MASTER SECTION / STEREO IN
3.2.
3.3.
3.4.
3.5.
3.10.
3.1.
3.6.
3.9.
3.7.
3.8.
3.1. STEREO IN
Mini Jack stereo 3.5mm input for PC, MP3 and several electronic devices. The volume depends on the MASTER-VOL regulation
3.2. DI-OUT
General output. XLR balanced type connector for connections of external systems. The output volume does not depend on the regulation of the
MASTER-VOL but is effected by changes in individual channel volume.
3.3. DI-OUT vol
This rotatory control sets the output level on the DI-OUT
3.4. LOW CUT
When engaged, this filter cuts all the frequncies below 180Hz. This function is ideal if you play an instrument that generates low frequencies aggressively,
it enables you to connect a subwoofer and prevent unpleasant vibration and possible damage to your DAVID.
3.5. MASTER
Controls overall system volume
3.6. LINE OUT
This unbalanced jack plug enables the connection of external systems. The output volume depends on the regulation of the MASTER-VOL.
3.7. INSERT
This stereo jack plug enables the connection of an external device (compressor, equalizer, etc.) in series to all the outputs
3.8. REVERB master
This control regulates the general level of the digital reverb, common to all channels. The amount of the effect can be regulated individually for the
single channel through the dedicated controls.
3.9. MUTE
Mute switch, cuts the audio on the master
3.10. Power LED
This LED indicates when the amplifier is switched ON
4. REAR PANEL
DAVID
100-WATT
ACOUSTIC
AMPLIFIER
DESGNED
IN
SWITZERLAND
M A D E I N I TA LY
POWER CONSUMPTION 70W
SERIAL NR.
www.schertler.com
TO REDUCE RISK OF FIRE, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE. FOR CONTINUED ROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH THE SAME TYPE AND RATING OF FUSE.
RISK OF ELCTRIC SHOCK DO NOT OPEN!
GND LIFT
2.1.
2.2.
2.3.
POWER IN
2.1. POWER ON/OFF
System ON/OFF switch.
2.2. GROUND LIFT
This switch connects and disconnects the ground
2.3. MAIN POWER CONNECTION
Connection to mains (230V~/115V~ - 50Hz/60Hz)
PLEASE ENSURE THE PROPER VOLTAGE AND USE THE ORIGINAL CONNECTION CABLE
SIGNAL FLOW
stereo in
GAIN
WARM
3B EQ.
JACK
TO LINE OUT
MASTER
PHANTOM
10V
OL
PHANTOM
24V
REVERB
GAIN
TO AMP
+
INSERT
low cut
OL
TO DI. OUT
3B EQ.
reson
XLR
JACK
PHANTOM
10V
NOTE
NOTE
NOTE
WARNINGS
PRECAUTIONS
WARNING
Read carefully this manual and follow these
precautions before operating the device
Keep this manual for possible future needs
Pay attention not to pour liquids onto the device and do not operate in conditions of excessive humidity
Do not install the device close to sources of excessive heat, do not expose it to direct solar radiation and do not position it without
protection in a dusty environment
Be sure that the main voltage does not exceed the value indicated on the back panel
Do not use the device if the main cable or the plug aren’t in a perfect condition (if necessary, replace it)
If the main cable has to be replaced, the operation must be carried out by qualified personnel. Replace the cable exclusively with one that
is an exact substitute
In order to avoid interference, do not install the device close to power transformers, TV sets, RF transmitters, electric motors or any source
of electric energy
Do not point microphones against speakers: this could generate annoying whistles (Larsen effect) that cause damage
In order to avoid unpleasant and costly inconveniences, use only original connecting cables
To completely disconnect this apparatus from the AC mains, disconnect the power supply cord plug from the AC socket
When cleaning, do not use solvents (e.g. acetone or alcohol). These could damage the external �finishing and the serigraphy
Do not attempt to service this product. In case of malfunction of any part of the system call the nearest technical assistance centre or a
specialized technical centre
For good ventilation, the heat sink should never be covered or obstructed by blankets, sofas or similar furniture. Be sure also to leave
sufficient clearance between the heat sink and any other surface
No source of flames, e.g. candles, should be placed on or near the device
The device should not be exposed to water, even in small amounts. No object containing liquids should be placed on or near the device
The device should only be connected to a mains socket outlet equipped with protection ground system
When the device is installed, be sure the mains socket and the plug of the mains cable are easily accessible
TECHNICAL DESCRIPTION
3.1. DESCRIPTION
Box two way, bass reflex
3.2. ENCLOSURE SECTION
Construction: Plywood
Weight:
10 kg
Dimensions: 29.5 x 25.5 x 35.5 cm
3.3. AMPLIFIED SPEAKER SECTION
Freq. resp.:
Sensivity:
SPL max:
50Hz - 30kHz (-3dB)
88.8 dB
106.8 dB
3.5. TECHNICAL SPECIFICATIONS OUTPUTS
LINE OUT:
Connector: JACK 6.3mm unbalanced
Level:
0dBu
Impedance: 200ohm
DI OUT
Connector: XLR balanced
Level:
-15dBu
Impedance: 200ohm
INSERT
Connector:
JACK 6.3mm
3.4. TECHNICAL SPECIFICATIONS INPUTS
3.6. INTERNAL EFFECT (digital reverb)
MIC channel
Connector: XLR balanced
Sensivity:
-52dB
Impedance: 4.7koh
Freq. resp.: 200Hz - 10kHz (-3dB)
Delay time: c.a. 30ms
Reverb time: c.a. 2.5 s
3.7. COMPONENTS
LINE channel
Connector: JACK 6.3mm unbalanced
Sensivity:
-47dB
Impedence: 820kohm
Stereo IN
Connector:
JACK 3.5mm stereo
Woofer:
Tweeter:
Cross-over:
Amplifier:
6”
Dome 1”
Active, 24dB/octave
70W + 30W
8ohm
0.001% THD (1000Hz)
ALL SCHERTLER® PRODUCTS ARE COVERED BY A LIMITED TWO-YEAR WARRANTY (FROM THE DATE OF PURCHASE) AGAINST MANUFACTURES
DEFECTS. DETAILS CAN BE OBTAINED FROM YOUR LOCAL DEALER/REPRESENTATIVE. SCHERTLER SA STRONGLY BELIEVES IN “COMMON SENSE”
AND THUS, MISUSE OF OUR PRODUCTS ARE NOT COVERED UNDER RIGHTS OBTAINED THROUGH OUR WARRANTY POLICY OR THAT OF INTERNATIONALLY RECOGNIZED TERMS AND CONDITIONS.
SCHERTLER SA IS CONSTANTLY AIMING TO IMPROVE ITS RANGE OF PRODUCTS THEREFORE, SCHERTLER SA RESERVES THE RIGHT TO AMEND
PRODUCT SPECIFICATIONS WITHOUT NOTICE.
THE SCHERTLER® NAME/LOGO ARE REGISTERED TRADE-NAMES/ TRADEMARKS OF SCHERTLER SA, SWITZERLAND.
All SCHERTLER® PRODUCTS ARE OF PROPRIETARY TECHNOLOGY AND COVERED BY ONE OF MORE WORLDWIDE PATENTS.