Doepfer A-120 Vintage Edition

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24 dB Low Pass 1 (VCF1)

Module A-120 is a voltage-controlled 24 dB low-pass filter, which filters out the high frequency components from a sound spectrum while allowing the low frequencies to pass unhindered. The cut-off frequency (corner frequency) determines the point at which this effect occurs. They can be set or modulated both manually and via control voltages (filter modulation, with an LFO for example).

The VCF1 is configured as a "transistor cascade" with an edge slope of -24 dB / octave, which is also used in various Moog synthesisers, This results in the typical, "legendary" Moog sound. The resonance (emphasis) can be adjusted at the VCF 1 up to self-oscillation. In this case, the filter operates as a sinusoidal oscillator.

Vintage edition with black front panel
Voltage-controlled 24 dB low-pass filter
Black front panel
Width: 8TE / 40.3 mm
Depth: 65 mm (measured from the back of the front panel)
Power requirements: 30mA (12V) / -20mA (-12V)

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Available since March 2016

Item number 383620

Sales Unit 1 piece(s)

Width 8 TE / HP

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in Filter Modules

11 Customer ratings

5 9 Customers 4 2 Customers 3 0 Customers 2 0 Customers 1 0 Customers

4.8 / 5

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8 Reviews

Moog ladder in Eurorack

Earl Langoustine 28.01.2021

This module gives you the classic Moog filter sound in Doepfer's 8hp format. If you've used one of the other Doepfer filter clones, you'll already have an idea of what this module is like. Of the three CV inputs, one tracks volt-per-octave and the other two come with attenuation. Resonance sounds very smooth and not piercing, as you would expect from this filter design, and also has input gain which seems to drive it. Pairs nicely within a larger Moog-style system - such as preceding this module with a CP3 mixer clone.

Important to note that these Doepfer filters are quite deep and will not fit in all skiffs (such as the Intellijel palette case). But on the positive, the currently listed specs above are wrong and the module is only around 55 mm deep (not the 65 mm listed above, the correct measurement is on Modulargrid).

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Hermanator 13.07.2021

I bought most of the Doepfer filter modules, and this is by-far my favorite. I didn't think that I'd like the bass response dropping off as resonance was increased, but I LOVE IT. I feel like this actually defines this filter. The adjustable sonic range on this is huge, when controlling level & resonance. I liked moog filters on softsynths & digital synths, but I LOVE this filter & authentic moog filters. There's a night & day difference between this & a digital emulation. It must be the way all of the transistors interact with one another as the resonance, level, and frequency is changed. Many digital emulations don't account for all of these minute differences. This thing really delivers. My only complaint, if any, are the knobs are a bit rough (hard on the hands to twist a lot). I'm tempted to replace them with a more comfortable knob, but I'd lose the classic look.

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Sauberer Filter und Sinus Osc

Anonymous 29.08.2016

Der A-120 gehört eher nicht zu den extremen Filtern, sondern ist ein sauber arbeitender Lowpass Filter mit Moog Charakter. Die Resonanz klingelt und blubbert angenehm, auch Selbstresonanz ist mit dem A-120 möglich. Praktisch sind die drei CV Eingänge, wobei CV1 den Filter als Sinus-Oszillator bespielbar macht, CV2 und 3 verfügen über einen Abschwächer und dienen zum Patchen von Hüllkurven u.ä. Insgesamt ein gutes sauberes Filter, das sich bei Selbstoszillation auch zur FM eignet. Die Vintage Optik des A-120v geht in Ordnung, die schmalen Knöpfe lassen Platz für die Finger, sehen aber für meinen Geschmack nicht ganz so toll aus.