WMD Quad Anti-Aliasing Filter - PDO Expansion
The WMD Quad Anti Aliasing Filter (QAAF) was conceptualized as the first epansion for the Phase Displacement Oscillator. It is designed to eliminate aliasing and stair-step distortion from the Digital to Analog converters. We opted to make this a seperate module because it is useful by itself as well as coupled with the PDO.
There are four independent filters inside the QAAF. Each -24dB/octave Butterworth filter runs at exactly the same frequency. The Butterworth filter has a small amount of resonance and a great sound. Each input jack is normaled from the expansion header that connects to the PDO, but any signal can be filtered by plugging in.
The frequency control circuitry uses a vactrol to control the clocking speed of each filter, slowing down the response to transient signals. This brings life and character to the sound.
- Four 4-pole filters
- Channel to Channel Freq +-0.5%
- Switched Capacitor Design
- Butterworth Response Curve
- CV Input
- Frequency Offset Knob
- Clock Input/Output
- Mix Output
- Low-Frequency Limit Jumper
- 4 HP
- Great for Pre & Post Filtering
For more detailed info, please click here.