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Old 17th March 2013, 07:33 PM   #11
bjorno is offline bjorno  Sweden
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FYI: A simple sub-woofer preamp(I have more than 25 Years of experience off) that is easily be changed to suit a 'low pass filter for input to powered sub'

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Old 17th March 2013, 08:20 PM   #12
willamp is offline willamp  United States
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bjorno: Thanks for the post. Yes I agree that could be used.

However, I'm beginning to think that what I should really do is use an active Linkwitz Riley type crossover to achieve the best rolloff from sub to main speaker. I'll set the crossover freq somewhere in the region of the overlap between them and connect both main and sub speakers to the appropriate output. This way I'm not trying to match the curve of my main speakers by some filter on the sub.

I see that Marchland Electronics sells a PC board that looks perfect.

XM1 Electronic Crossover Network
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