Metasonix RK6 Resonant Lowpass Filter


Often customers ask me how to add some warmth to a digital signal or sample. I never really had an answer ready, because many devices saturate and distort nicely but lack in delivering on precisely this cliché. When it comes down to it, to make it sound warm all the ugly, cold and overexaturated parts of the signal should be eliminated. The beautiful parts should be captured and enhanced. The Metasonix RK6 closes this gap like a hero. Listen to the linked Video below to hear how it forms a round piece of music from of a cold, stiff wavetable sequence. The 2nd part of the video contains pure Metasonix DNA.

Conclusion: It is ugly but closes a crucial gap in your soul.

Phil (Eurorack expert)



The RK6 is a Sallen-Key low-pass filter with an edge steepness of -12 dB per octave. It features a 17JK8 dual triode. The tube is operated more conservatively than usual to ensure maximum lifetime. Incoming audio material can be leveled before reaching the actual filter. Cutoff and resonance are adjustable via potentiometers. In addition, it is possible to influence both parameters via control voltages. The cutoff CV input accepts signals in the range of 0 V to +3 V. It roughly follows the Hz/v standard. The resonance behavior varies depending on the cutoff setting.


Audio input
Cutoff and resonance CV inputs
Audio output


3U Eurorack module, 8 HP wide
Power consumption: 100 mA at +12 V and 2 mA at -12 V. - Attention! While heating up, the module draws about 200 mA at +12 V

0.2 kg
Article Number
Status: The article can be picked up in the shop right now / article is ready for dispatch
availability ? immediately available
€ 19% VAT excl. €326.89 € 19% VAT incl. €389.00
Excl. 19% VAT, Excl. shippingLieferzeit 1