| 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
> tech specs
Power draw : 35mA @ +12V / 35mA @ -12V
Depth : 40mm.