Harley Benton 420194 Custom Line Acoustic Preamp User Guide
- June 13, 2024
- Harley Benton
Table of Contents
Harley Benton 420194 Custom Line Acoustic Preamp
Product Information
The Acoustic Preamp is a device designed to amplify 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 amplifying 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.
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
- VOLUME – volume control
- BASS – bass control
- SHAPE – attenuates mids, boosts treble and bass
- PHASE – phase inversion for suppressing feedback
- TREBLE – treble control
- GAIN – controls the input gain, to adopt active or passive pick-ups
- TUNER – tuner output (1/4″ jack)
- CLIP – lights green when signal is present, lights red on overload
- CHORUS
- SPEED: controls the effect speed
- DEPTH: controls the effect depth
- LED: indicates whether effect is on or off
- INPUT – instrument input (1/4″ jack)
- LINE IN – input for line level devices (3.5 mm mini jack)
- D.I. – may reduce hum caused by ground loops
- CHORUS – turns Chorus effect on or off
- 9 V – connector for power adapter (not supplied)
- REVERB – turns Reverb effect on or off
- DI OUT – output to connect to a mixing console (XLR)
- PHONES – headphones out (3.5 mm mini jack)
- 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
- OUTPUT – output to connect to an amplifier (1/4″ jack)
Using the product
-
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.
-
Connect an instrument to the INPUT jack using a 1/4″ jack cable and turn the GAIN knob to the left stop.
-
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.
-
To adjust the volume, turn the VOLUME knob to the desired position.
-
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.
-
To check the correct tuning of the instrument, you can connect a tuner to the TUNER output.
-
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.
-
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.
-
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.
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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. -
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.
-
After playing, disconnect a used 9 V power adapter from the mains power supply.
Technical specifications
- Connections
- tuner 1/4″ jack socket
- instrument 1/4″ jack socket
- line 3.5 mm jack socket
- mixing console XLR chassis socket, 3-pin, balanced
- headphone 3.5 mm jack socket
- amplifier 1/4″ jack socket
- Power consumption 110 mA
- Power supply External power adapter, 100 – 240 V ~ 50/60 Hz or 9 V battery
- Operating voltage 9V= / 1 A, centre negative
- Dimension (W × H × D) 128 mm × 93 mm × 58 mm
- Weight 435 g
- Ambient conditions
- 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]