This custom electronic crossover is based loosely on the Dahlquist DQ-LP1 crossover, in that it is passive (first order) on the high end and active 3rd order on the low end. Power supply and parts are significantly upgraded from the Dahlquist version, starting with a large 120VA power transformer with a Sulzer low impedance regulated power supply with pre-regulator. The audio section uses selected and matched WIMA polypropylene caps, Holco resistors, and OPA2604 op amps. The low pass level control is a Noble dual pot. The low pass frequency selection is accomplished via gold plug-in sockets, and a modules are included for 100Hz (in the unit now) and 40Hz, plus some blanks to assemble any frequency you need. The circuit also includes a fixed 3rd order high pass filter at 18Hz. Includes schematics of both the power supply and audio circuit. This unit completely re-capped a few years ago. Cosmetically, the faceplate looks excellent, but the rest of the case shows some wear and use marks, especially on the plexiglass cover. Note that the unit has a power-on thump, so the front panel muting switch should be in “mute” during power-up. Asking $450 plus shipping.
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