Doepfer A-138b

Mixer with Logarithmic Potentiometers

  • Primarily suitable for audio signals
  • Width: 8 HP
  • Depth: 35 mm
  • Power requirements: +10 mA (+12 V) / -10 mA (-12 V)

These are other customers' choices:

Customers who looked at this item have bought these:

Doepfer A-138b
43% bought this exact product
Doepfer A-138b
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
55 € Add to Cart
Doepfer A-138s Mini Stereo Mixer
16% bought Doepfer A-138s Mini Stereo Mixer 75 €
Doepfer A-138a Mixer Linear
13% bought Doepfer A-138a Mixer Linear 55 €
Dreadbox Attenuator
5% bought Dreadbox Attenuator 29 €
Doepfer A-183-2 Offset Generator
5% bought Doepfer A-183-2 Offset Generator 44 €
Our most popular Mixer, Attenuator Modules
52 customer ratings:
  • 5
  • 4
  • 3
  • 2
  • 1
4.7 / 5.0
  • handling
  • features
  • quality
20 written ratings Read all reviews
Total

Doepfer A-138-B Mixer

Blair, 18.11.2013
The A-138b is essentially a 4 into 1 mixer optimised for audio signals rather than control voltages. the 'b' in the name means the the mixer uses logarithmic rather than linear potentiometers.

For me the A-138b is an essential piece of equipment because it enables me to sum the outputs of up to 4 sound sources (for instance VCO's or noise sources) before sending the combined output to my A-108 Low pass filter module.

With one input employed, and with the channel and master levels set to 10, the volume of the output is the same level as the input signal. in other words, this module will not increase the gain of an input, it will only attenuate it.

When using multiple inputs I find I have to reduce the levels of the individual channels quite a lot, otherwise the output from the mixer becomes to much for next module in the chain. So if I am using 3 inputs, I will use a maximum of about 33% of each channel's volume.

The mixer appears to operate very quietly. It does not introduce much 'hiss' into the sound. Some reviewers have found otherwise , so it may be that my ears are not as sensitive as theirs.

I have rated the A-138b as 5 stars except for features, which I have given a 4 for. The reason for this is that the Doepfer website indicates that with no input into channel 1, the channel 1 level will act as a +5 volt DC offset. In other words, the unit *can* increase the level beyond that of an input signal. However, my unit doesn't work like this. As delivered, all 4 inputs on my A-138b work in the same way. The manual says there is a jumper I need to re-position on the rear of the circuit board to achieve the +5 volt DD offset with input level 1. I think this option should have been made available as a toggle switch on the front panel. It would be useful on occasions when I am only using 3 inputs, but I do not want to have to remove the unit from its case and re-position a jumper each time to achieve this!

Overall, another useful and great value unit from Doepfer, in my opinion.
Helpful · Not helpful · Report review
Report rating…

Do you believe this rating to be inaccurate or unacceptable for some reason?

Send report
Total

Does its job!

19.01.2017
Very useful 4 into 1 mixer. I've used it to mix VCO waves into the Wasp filter and the A-116 wave processor.
Will be used a LOT.
Helpful · Not helpful · Report review
Report rating…

Do you believe this rating to be inaccurate or unacceptable for some reason?

Send report
Show variations of this product
Doepfer A-138b
(52)
Doepfer A-138b

Mixer with Logarithmic Potentiometers Primarily suitable for audio signals, Width: 8 HP, Depth: 35 mm, Power requirements: +10 mA (+12 V) / -10 mA (-12 V)

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-110-1
(62)
Doepfer A-110-1
to the product
139 €

Standard VCO for Modular System A-100Module A-110-1 (VCO) is a voltage controlled oscillator. The A-110-1 produces frequencies in a range of about 8 octaves, of which four waveforms are available...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-124 Wasp Filter SE
(34)
Doepfer A-124 Wasp Filter SE

Wasp Filter Special edition, Special 12 dB multimode filter, Circuit technology of the "EDP Wasp", Black front, Yellow pot caps, Width: 8 HP, Depth: 45 mm, Power requirements: +30 mA (+12 V)/-10 mA...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-138s Mini Stereo Mixer
(6)
Doepfer A-138s Mini Stereo Mixer

Mini Stereo Mixer 4-in-2 mix module in Eurorack format, Four inputs with attenuator and pan control, plus two 3.5 mm mini jack outputs, Width: 8 HP, Depth: 30 mm, Power requirements: +10 mA (+12 V)...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-100 LC1 Low Cost Case
(5)
Doepfer A-100 LC1 Low Cost Case
to the product
119 €

Case for Eurorack Modules Integrated power supply A-100SSB: +12 V / 380 mA, -12 V / 380 mA, To 48 TE shortened A-100LC3 version, Built-in bus board with 8 module slots, Casing made of raw wood -...

  • Module: No
  • Empty Rack, Or Housing: Yes
  • Basic System: No
  • Accessories: No
Doepfer A-160-2 Clock Divider II
(12)
Doepfer A-160-2 Clock Divider II

Frequency divider For clock/trigger/gate signals, Width: 4 TE/ 4 HP / 20 mm

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-180-2 Multiples
(60)
Doepfer A-180-2 Multiples

Passive Multi-Port Distributor 8x Interconnected jacks, Sockets are divided into 2x quadruple groups; but can also be modified to an eight-multiple (soldering bridge on the circuit board), Width:...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-180-3 Dual Buffered Multiple
(11)
Doepfer A-180-3 Dual Buffered Multiple

Synthesizer module Double buffered 1-in-3 multiple, For buffering and duplication of CV and audio signals, Width: 4 TE / 4HP / 20.0 mm

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-132-3
(23)
Doepfer A-132-3

VCA Switchable characteristic between linear and exponential, Audio and CV signals can thus be optimally processed, Width: 8 HP, Depth: 50 mm, Power requirements: +30 mA (+12 V)/-30 mA (-12 V)

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-140
(55)
Doepfer A-140

ADSR Envelope Generator The module A-140 is a envelope generator and since it delivers control voltages, belongs to the modulation-modules. As soon as the ADSR is triggered at gate-input, it...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-118 Noise/Random
(48)
Doepfer A-118 Noise/Random

Noise/Random Voltage Generator Module A-118 is a noise and random voltage generator. It produces the following signals: white noise, coloured noise, and random voltage. White and coloured noise can...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-134-1 Vc Pan MKII
(11)
Doepfer A-134-1 Vc Pan MKII

Voltage-Controlled Panning Module The A-134 is a voltage-controlled panning module. The module consists of 2 linear VCAs, which are inversely controlled by a control voltage, i.e., the more the...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
55 €
Incl. VAT; plus 20 € shipping
Free shipping from 298 €
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
Share this product
Your Contacts
Phone: +49-9546-9223-30
FAX: +49-9546-922328
Offers include 24% Greek VAT and are valid as long as stocks last. Shipping costs to Greece are 20 EUR, free shipping on orders above 298 EUR. Please click here for international Shipping rates. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
Slate Digital ML-2 Harley Benton Fusion-HSH Roasted Maple Alesis Nitro Kit Mesh Kit Slate Digital ML-1 DPA 4066-OC-A-F10-LH JHS Pedals The Bonsai Zynaptiq Intensity Sennheiser ew IEM G4 A-Band Korg KONNECT Sound Devices MixPre-6M Tech 21 DP-3X Harley Benton Dynamic-HSH FMT Charcoal
(2)
Recommended
Slate Digital ML-2

Small Diaphragm Condenser Microphone For Slate Digital VRS8 Thunderbolt audio interface, similar linear and flat frequency response to the Slate Digital ML-1, Allows microphone placement that is difficult or impossible for a larger microphone, Side mounted pad switch -...

to the product
159 €
Recommended
Harley Benton Fusion-HSH Roasted Maple

Electric Guitar Ergonomically shaped mahogany body, "Ultra Flame" flamed maple veneer top, Matching headstock, Bolt-on neck from "roasted" Canadian flamed maple, "Roasted" maple fretboard, Neck shape: Modern C, Clay Dot fretboard inlays, 24 Medium jumbo stainless steel frets, Nu-Bone...

to the product
415 €
Recommended
Alesis Nitro Kit Mesh Kit

Alesis Nitro Mesh Kit, e-drum set for beginners, Mesh Heads for toms and snare, Nitro drum module with 385 sounds, 25 preset kits, 15 user kits, 60 songs, metronome, mono 1/4" jack outputs (L/R) to connect speakers or mixer, stereo...

to the product
379 €
Recommended
Slate Digital ML-1

Large-diaphragm condenser microphone Neutral ML-1 condenser microphone that can be combined with VMS hardware and software, Optional Neutral VMS preamp ensures minimal sound-colouration (not included!), Via VMS plug-in software, you can completely change the sound characteristics even after recording,...

to the product
866 €
Recommended
DPA 4066-OC-A-F10-LH

DPA 4066-OC-A-F10-LH, d:fine CORE 4066 Omni Headset Mic, professional headset microphone with removable and adjustable neck holder for left or right-sided use. Omnidirectional, 20Hz-20kHz with 3dB boost between 8-20kHz, 144dB SPL max.,TA-4F Switchcraft connector for Shure Transmitter . beige, Great...

to the product
719 €
(1)
Recommended
JHS Pedals The Bonsai

Effect Pedal Overdrive, 9 Tube Screamer Overdrive modes, 5 Classic TS circuits and 2 popular mods, Analogue operation, True bypass, Volume, sustain and tone controls, 9-Way rotary control to select between Tube Screamer modes (OD-1 / TS-808 / TS-9...

to the product
259 €
Recommended
Zynaptiq Intensity

Zynaptiq Intensity (ESD); enhancer plugin; innovative algorithm increases detail, clarity, density and loudness of any audio signal; suitable for single tracks, groups, mixbus or mastering; easy to us clearly arranged user interface; additional soft-knee saturating limiter at the output stage;...

to the product
152 €
Recommended
Sennheiser ew IEM G4 A-Band

Evolution Wireless In Ear System Consists of UHF bodypack receiver (EK IEM G4), 9.5" transmitter (SR IEM G4) and IE4 earphones, Stereo / focus / mono modes, Up to 1680 frequencies in 42 MHz switching bandwidth, 20 Channel banks...

to the product
990 €
Recommended
Korg KONNECT

Portable, Powerful Stereo PA System Equipped with: 6.5" Woofer and 2 x 1" tweeter, Output power woofer max. 140 W (top), Output power tweeter: max. 20 W x 2 (top), Frequency range: (-10dB): 55 - 20,000 Hz, DC 20V...

to the product
425 €
Recommended
Sound Devices MixPre-6M

Portable multitrack audio recorder and USB audio interface Max. of 12 tracks, 6 of them simultaneous, Kashmir microphone preamplifier with 76 db gain, Inherent noise:-128 dBu max. (A-weighted, gain = 76 dB, 150 ohm source impedance), Limiter per channel,...

to the product
969 €
Recommended
Tech 21 DP-3X

Preamp for bass dUg Pinnick signature model, Controls: volume, chunk, high, mid, low, comp, drive, Gain switch, Mix button, Chromatic tuner, XLR DI output, TRS input / output, Headphone output, Dimensions (W x D x H): 19.7 x 6.4...

to the product
299 €
Recommended
Harley Benton Dynamic-HSH FMT Charcoal

Electric Guitar Ergonomically shaped mahogany body, "Ultra Flame" flamed maple veneer top, Bolt-on Canadian Hard Maple neck, Ebony fretboard, Neck profile: Modern C, Clay Dot fretboard inlays, 24 Medium jumbo stainless steel frets, Nu-Bone nut, Nut width: 42 mm,...

to the product
259 €
Feedback Found an error or want to give us feedback about this page?

We're looking forward to hearing from you and aim to solve any problems as soon as we can.

Please leave a comment. Please enter your e-mail address.