New Multi-Mode Filter Module

ADDAC System 604 Dual Filter can be used anywhere in a stereo signal path      27/01/20

New Multi-Mode Filter Module


ADDAC System has announced its new 604 Dual Filter — a multimode filter designed to be used in a stereo signal path. ADDAC System says that as it develops its modules, minor breakthroughs occur to inspire other modules, and such was the case with the 604 Dual Filter, which they say takes its inspiration from the unique sound of the ADDAC 105 4 Voice Cluster which was announced last November.

André Gonçalves, founder of ADDAC System, told us, “While developing our 105 4 Voice Cluster module, we created brand new multi-mode filter designed to be placed after the summing mix stage. We were so pleased with its sound that we decided to release it as a dedicated filter."

To make the module more interesting, ADDAC System engineers duplicated the circuitry of the new multi-mode filter so it could be used anywhere in a stereo signal path. Further, to add sonic versatility, a switch was also included to set the working mode from Stereo to Dual Mono mode, in which both filters can be used independently.

In Stereo Mode the Left Cutoff is used to control the Right Cutoff. In this case, the Right Cutoff Knob and CV Input are simply bypassed and will have no impact on the Right Channel operation. This allows immediate sync of both filter frequencies when the Stereo position is engaged.

Optionally there’s a jumper in the back of the unit that, when placed, connects the Right Controls back to the Right CV control. This allows the user to control the offset of the Right Channel Cutoff. Meantime, resonance is independent on both Modes and still has to be set manually to match both channels.

Both the Audio and CV inputs are normalled from the Left into the Right channels. As expected, plugging any input to the Right channels removes this connection.

Pricing and Availability:
The ADDAC System 604 Dual Filter will be shipping in March at a price of €180 and will also be available as a full DIY kit.

More information:

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