User Manual

ManualsBrandsDoepfer ManualsAudioA-139 Headphone Amplifier (no longer available)

doepfer

System A - 100

Headphone Amplifier

A-139

1. Introduction

Module

A-139

is a

stereophonic headphone ampli-

fier.

One or two stereo headphones with 6.3mm (1/4”)

stereo jack plugs can be connected to the A-139. The

minimum headphone impedance is 8 Ohm.

The levels of the audio signals connected to the audio

inputs can be adjusted separately for each input.

The

Master Level

knob controls the overall loudness

for both channels.

The maximum power output is 2 x 1.5 W.

A-139

Head Phone Amplifier

Master

Level

Lev. 2

Lev. 1

Input 1

Input 2

Head

Phone

Summary of content (4 pages)

PAGE 1
System A - 100 doepfer Headphone Amplifier A-139 1. Introduction A-139 Head Phone Amplifier Lev. 1 Input 1 Module A-139 is a stereophonic headphone amplifier. One or two stereo headphones with 6.3mm (1/4”) stereo jack plugs can be connected to the A-139. The minimum headphone impedance is 8 Ohm. The levels of the audio signals connected to the audio inputs can be adjusted separately for each input. Lev. 2 The Master Level knob controls the overall loudness for both channels.
PAGE 2
A-139 Headphone Amplifier System A - 100 Controls: 2. HPA - Overview A-139 HPA Head Phone Amplifier Input 1 10 Lev. 2 Input 2 ➁ 0 10 Master Level ➂ 0 2 Attenuator for audio signal at input ! 2 Lev. 2 : Attenuator for audio signal at input " 3 Master Level: Overall loudness for both channels ➀ Head Phone 1 Lev. 1 : Lev.
PAGE 3
System A - 100 doepfer § Head Phone 3. Controls 1 Lev. 1 • 2 Lev. 2 Attenuators 1 and 2 adjust the relative level of the audio signals at inputs ! and " respectively. Basically, these controls are used to compensate for different levels of the input signals. 3 Master Level Control 3 is used to adjust the overall loudness and affects both channels (stereo potentiometer). Important: Turn this knob fully counterclockwise and then turn it slowly clockwise until the desired loudness is reached.
PAGE 4
A-139 Headphone Amplifier System A - 100 doepfer 7. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system.