Magnepan 3.6 Active Crossover

Davey's Magnepan 3.6 Active Crossover

This circuit duplicates the transfer function of the stock crossover.

Level controls can be added to two of the three sections for fine tuning.
The input buffer implements a very low frequency high-pass filter.
Op-amps are Burr-Brown OPA2134 or equivalent.
Resistors are 1% metal film.
Capacitors are Panasonic ECQ-P or equivalent.

Responses of the three filter sections are shown in color. The total response curve is not meaningful since acoustic response has not been taken into account.

Schematic of the stock 3.6 crossover

DCR of the coils is not shown, but was taken into account on the graph below.

Response of the three filter sections of the stock crossover for comparison to above.

Magnepan 3.6 two-way line level crossover

(Two stereo amps required and external portion of the stock crossover is removed.)

* alternate email for Dave Reite