Doepfer A-138n

Doepfer A-138n; Eurorack module; compact 4-channel mixer; works for CV and audio signals; level control per channel; 4x signal input; 2x mix output; power consumption: 10mA (+12V) / 10mA (-12V); width: 4 HP; depth: 30 mm

Further Information

Modul Type Mono
Width 4 TE / HP

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Doepfer A-138b Rating from Doepfer A-138b
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.
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Show variations of this product
Doepfer A-138n
Doepfer A-138n

Doepfer A-138n; Eurorack module; compact 4-channel mixer; works for CV and audio signals; level control per channel; 4x signal input; 2x mix output; power consumption: 10mA (+12V) / 10mA (-12V);...

  • Modul Type: Mono
  • Width: 4 TE / HP
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  • Module: Yes
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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)

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Mixer Module Mixers with logarithmic potentiometers, Primarily for mixing audio signals, Vintage edition with black front panel, Width: 8 HP, Depth: 35 mm, Current consumption: +10mA (+12V) / -10mA...

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€49 £44.10
Including VAT; Excluding €10 shipping

The price in GBP is a guideline price only!

Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
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Offers include 20% UK VAT and are valid only whilst stocks last. Delivery to the UK costs 10 EUR (approx. £9), free shipping on orders above 149 EUR. Please click here for more on international delivery costs and times. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
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