- Written by John E. Johnson, Jr.
- Published on 15 February 2012
The Bryston 10B-SUB Active Stereo Crossover Network On the Bench
First, let's take a look at the frequency response of the low-pass and high-pass outputs, with the crossover frequency set to 60 Hz, and with different slopes.
The red lines show the response from the low-pass output at the three slopes, while the yellow lines represent the response from the high-pass output for the three slopes. You can see that all converge exactly at 60 Hz. Not 57 Hz or 63 Hz. Dead on at 60 Hz.
You can see why I did not hear any significant deep bass from the ESLs using 60 Hz high-pass, at 18 dB/octave. That is because, with the movie playing, any signal at 30 Hz (very likely in Pearl Harbor) was attenuated by 18 dB, which is a lot.
Distortion also proved to be very low.
At 20 Hz, 2 volts from the low-pass output, THD+N was only 0.003%. And look at the noise floor. Wow!
At 10 kHz, 2 volts from the high-pass output, the results were only 0.001% THD+N.
In essence, the 10B-SUB will not produce any audible deterioration in the signal. Of course, anything in the signal path deteriorates the signal, but there are two questions to be answered: (1) is the deterioration audible?; and (2) does the benefit of what you put in the signal path outweigh the deterioration? Well, I didn't hear whatever miniscule deterioration that occurred, and definitely, the benefit outweighed what I couldn't hear anyway :=>