Intellijel Quad Inverter 1U
Used Intellijel Quad Inverter 1U
Malekko Heavy Industry IMX Invert Mixer
Quant Gemi - Quad Octave Utility
Angle Grinder - Quadrature VCO / State Variable Filter
MidSide+
WMD Quad Anti Aliasing Filter (QAAF)
4ms Quad Clock Distributor (QCD)
Envy Machine - Quad Envelope Modulation Monster