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Old 12-26-07, 09:48 AM   #15 (Link)
brucek
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Re: BFD as a low pass


Quote:
I know that I want to be able to EQ, have a low pass@ 80hz and prevent my sub from bottoming out. Ive stumbled across a thread where brucek mentioned that a HPF at 10hz probably already exisists. Which has me thinking if a subsonic filter is really necessary, and if i really need to be spending more money on seemingly confusing gear.

As for the low pass filter, I read from another thread where brucek also mentioned that with roughly 6 filters on the BFD you can create a LPF
Well, the EQ part is fine, and you can certainly make a decent resemblance to a low pass with the BFD, but the high pass isn't a function that can be created with filters that the BFD provides.

If you consider your sub audio chain (including the processor and BFD), it's entirely possible you may indeed have sufficient rolloff to protect your sub, but I wouldn't rely on it if you don't know for sure. You would have to test your own system with REW to find out. Ported subs will unload pretty quick, and so you want to check if you're OK before not using a subsonic filter.

brucek


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