Crossover Networks

Bryston 10B-SUB Active Stereo Crossover Network

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The Bryston 10B-SUB Active Stereo Crossover Network In Use

I set the 10B-SUB as a stereo two-way configuration (you can also configure it as two-way summed low pass, or a monaural three-way crossover, which could be used for tri-amping a speaker that has a tweeter, midrange, and woofer, but no crossover network inside the enclosure).

The two low-pass outputs were connected to my two subwoofers, and the two high-pass outputs were connected to the power amplifiers that drive my two ESLs.

I set the attenuator to its straight up position, which is basically input = output.

I used the attack scene from Pearl Harbor to make my adjustments by ear, and ended up using a 60 Hz low-pass, 60 Hz high-pass, at 18 dB/octave.

The problem was solved completely. No more audible low frequencies in the ESLs below 60 Hz, and no more unwanted upper bass in either of the subwoofers. I also tried using different slopes and crossover frequencies (not necessarily the same for the low-pass as for the high-pass), but the final solution was the configuration mentioned above. Note, that you should also experiment with the slopes and the crossover frequencies for both the low-pass and high-pass, as it will affect the soundstage, and you will be delighted when that magic combination snaps into place.

I have a very high-end home theater system, and I was worried that putting the active crossover in the signal path, especially when I also use the front two channels for stereo music listening, so I ran some bench tests, with the results shown on the next page.