420194 Custom Line Acoustic Preamp
Product Information
The Acoustic Preamp is a device designed to preamplify signals
from musical instruments. It features various operating elements,
including controls for reverb, chorus, dwell, shape, phase, and
volume. The device also has input and output jacks, a tuner output,
and a 9V socket for power.
Safety Instructions
- Ensure the device is used for its intended purpose of
preamplifying signals from musical instruments. - Keep the device away from children to prevent choking hazards
and injuries. Store packaging material out of their reach. - Insert batteries correctly to avoid potential damage to the
device or batteries. - Remove batteries if the device will not be used for an extended
period to prevent damage from leaking batteries. - Avoid using flammable cleaning agents on the device.
Features
The Acoustic Preamp offers the following features:
- Reverb control to adjust the amount of reverb mixed with the
dry signal. - LED indicator to show whether the effect is on or off.
- D.I. output for connecting to other devices.
- Tuner output for checking instrument tuning.
- Chorus effect with adjustable speed and depth.
Product Usage Instructions
- To power the unit, insert a 9V battery or connect a 9V DC
adapter to the 9V socket on the front of the unit (center negative
polarity). - Connect your instrument to the INPUT jack using a 1/4″ jack
cable. Turn the GAIN knob counterclockwise to the left stop. - Play your instrument and gradually turn the GAIN control
clockwise. Observe the CLIP LED. If it turns red, the input is
overloaded and distortion occurs. Adjust the GAIN control
counterclockwise until the LED lights up green only. - To adjust the volume, turn the VOLUME knob to the desired
position. - Use the BASS and TREBLE knobs to adjust the desired sound. When
the SHAPE switch is in the ON position, it attenuates the mids and
boosts the treble and bass. - To check instrument tuning, connect a tuner to the TUNER
output. - To accompany your playing, connect a device with line level
output to the LINE IN jack. The signal is present at all outputs of
the device. - To activate the Chorus effect, press the CHORUS switch. Adjust
the desired speed using the SPEED knob and the effect depth using
the DEPTH knob. The corresponding LED will light up when the effect
is activated.
Acoustic Preamp
Quick Start Guide
This quick start guide contains important information on the safe operation of the product. Read and follow the safety advice and instructions given. Retain the manual for future reference. If you pass the product on to others please include this manual.
EN
Safety instructions
Intended use This device is intended to preamplify signals from musical instruments. Any other use or use under other operating conditions is considered to be improper and may result in personal injury or property damage. No liability will be assumed for damages resulting from improper use.
Risk of injury and choking hazard for children! Children can suffocate on packaging material and small parts. Children can injure themselves when handling the device. Never allow children to play with the packaging material and the device. Always store packaging material out of the reach of babies and small children. Always
dispose of packaging material properly when it is not in use. Never allow children to use the device without supervision. Keep small parts away from children and make sure that the device does not shed any small parts (such knobs) that children could play with.
Risk of fire due to incorrect polarity Incorrectly inserted batteries may destroy the device or the batteries. Ensure that proper polarity is observed when inserting batteries.
Possible damage by leaking batteries Leaking batteries can cause permanent damage to the device. Take batteries out of the device if it is not going to be used for a longer period.
Where to use the product Never use the product · in conditions of extreme temperature or humidity · in extremely dusty or dirty areas · at locations where the unit can become wet
General handling · To prevent damage, never use force when handling the product. · Never immerse the product in water. Just wipe it with a clean dry cloth. Do not use
liquid cleaners such as benzene, thinners or flammable cleaning agents.
Features
· Two-channel tone control with switchable mids shaping · Reverb and chorus effect · Headphones out
· Line input to add AUX signals · Tuner output · Operation via 9 V battery or 9 V power adapter (not included)
Operating elements
ö # $% & ‘
4 3 2
1
DWELL
SHAPE PHASE
ON
IN
OFF REVERB
OUT SPEED
DEPTH
REVERB REVERB
CHORUS CHORUS
0/
.
TUNER
( ) *
+
-,
1 VOLUME volume control 2 BASS bass control 3 SHAPE attenuates mids, boosts treble and bass 4 PHASE phase inversion for suppressing feedback 5 TREBLE treble control 6 GAIN controls the input gain, to adopt active or passive
pick-ups 7 TUNER tuner output (1/4″ jack) 8 CLIP lights green when signal is present, lights red on
overload 9 CHORUS SPEED: controls the effect speed
DEPTH: controls the effect depth LED: indicates whether effect is on or off 10 INPUT instrument input (1/4″ jack) 11 LINE IN input for line level devices (3.5 mm mini jack)
12 D.I.
may reduce hum caused by ground loops
13 CHORUS turns Chorus effect on or off
14 9 V
connector for power adapter (not supplied)
15 REVERB turns Reverb effect on or off
16 DI OUT output to connect to a mixing console (XLR)
17 PHONES headphones out (3.5 mm mini jack)
18 REVERB DWELL: controls the decay of the reverb effect
REVERB: controls the amount of reverb mixed
with the dry signal
LED: indicates whether effect is on or off
19 OUTPUT output to connect to an amplifier (1/4″ jack)
Thomann GmbH · Hans-Thomann-Straße 1 · 96138 Burgebrach · www.thomann.de · [email protected]
DocID: 420194_18.04.2023
EN
Acoustic Preamp
Using the product
1. To power the unit, you can insert a 9 V battery or connect a 9 V DC adapter to the 9 V socket on the front of the unit (centre negative ). The device is immediately ready for use.
2. Connect an instrument to the INPUT jack using a 1/4″ jack cable and turn the GAIN knob to the left stop.
3. Play the instrument, turn the GAIN control clockwise and observe the CLIP LED. When the colour changes from green to red, the input is overloaded and distortion occurs. Then turn the GAIN control counter-clockwise until the LED lights up green only.
4. To adjust the volume, turn the VOLUME knob to the desired position.
5. Use BASS and TREBLE knobs to adjust the desired sound. When you set the SHAPE switch to the ON position, the mids will be attenuated and the treble and bass will be boosted.
6. To check the correct tuning of the instrument, you can connect a tuner to the TUNER output.
7. To accompany your playing, you can connect a device with line level output to the LINE IN jack. The signal is present at all outputs of the device.
8. To use the Chorus effect, press the CHORUS switch, use the SPEED knob to adjust the desired speed, and the DEPTH knob to adjust the desired effect depth. The corresponding LED is lit when the effect is activated.
9. To use the Reverb effect, press the REVERB switch, use the DWELL knob to set the desired decay time, and use the REVERB control to adjust the desired reverb ratio. The corresponding LED is lit when the effect is activated.
10. You can connect headphones to the PHONES output.
Possible hearing damage
Making music for a prolonged period and at high volume can cause hearing damage. Avoid playing the unit at full volume, especially when using headphones.
11. You can connect the input of an amplifier to the OUTPUT jack. Before doing so, turn the VOLUME knob to the left stop to avoid loud noise when connecting.
12. After playing, disconnect a used 9 V power adapter from the mains power supply.
Technical specifications
· Connections – tuner – instrument – line – mixing console – headphone – amplifier
· Power consumption
1/4″ jack socket 1/4″ jack socket 3.5 mm jack socket XLR chassis socket, 3-pin, balanced 3.5 mm jack socket 1/4″ jack socket
110 mA
· Power supply
· Operating voltage · Dimension (W × H × D) · Weight · Ambient conditions
External power adapter, 100 – 240 V ~ 50/60 Hz or 9 V battery 9 V / 1 A, centre negative 128 mm × 93 mm × 58 mm 435 g Temperature range 0 °C…40 °C Relative humidity 20 %…80 %
(non-condensing)
For the transport and protective packaging, environmentally friendly materials have been chosen that can be supplied to normal recycling. Ensure that plastic bags, packaging, etc. are properly disposed of. Do not just dispose of these materials with your normal household waste, but make sure that they are collected for recycling. Please follow the notes and markings on the packaging.
Batteries must not be disposed of as domestic waste or thrown into fire. Dispose of batteries according to national or local regulations regarding hazardous waste. Dispose of empty batteries at appropriate collection sites.
This product is subject to the European Waste Electrical and Electronic Equipment Directive (WEEE) in its currently valid version. Do not dispose of your old device with your normal household waste. Dispose of this product through an approved waste disposal firm or through your local waste facility. Comply with the rules and regulations that apply in your country. If in doubt, consult your local waste disposal facility.
Thomann GmbH · Hans-Thomann-Straße 1 · 96138 Burgebrach · www.thomann.de · [email protected]
DocID: 420194_18.04.2023
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