I suggest you contact Bryston to enquire about changing resistors to establish a lower crossover frequency. Schematics used to be available. An 18db/octave slope will need a polarity swap to the sub. 6 and 12 do not need a polarity swap. It was impossible for me to determine bass response by ear so I purchased the CM-140 and I run REW on a netbook along with a Presonus AudioBox USB.
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