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brucek wrote:
 When you added the mains it created a peak around 80 - 90Hz which is fairly common. This is corrected by changing the phase control on the sub. If you're lucky enough to have a variable control you should be able to get it quite flat. |
I do have a variable control, so I'll mess around with it some more. I tried it at 1/4, 1/2, 3/4 and full phase shift and didn't get better than what I showed. I'll play around some more with smaller shifts and see if it helps.
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actually the simple notch filter worked pretty good.
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yeah, that surprised me too - the good 'ol B&K still has some tricks up its sleeve
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As far as the hot sub signal at the receiver is concerned. You should get the level of the sub from the receiver set to satisfy the correct input level of the BFD and then never touch that again. After that, all level adjustments of the sub should be with the sub amplifiers gain control. (are you familiar with setting up the BFD input level? If not read the section in the BFD Guide on that subject).
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I am familiar with that and did set the inputs correctly. I was referring to the gain on the sub amp. I'm not going to touch anything "pre-BFD" (if that makes sense). After demo'ing some material I ended up dropping the sub amp to about 3db hot relative to the mains. What I still don't understand is if that is hot relative to the house curve, or whether it is simply part of it?
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The dips past 100Hz aren't equalizable. You can treat the room or live with it. Peaks and dips in the mains are not as noticeable as those room mode peaks and dips in the sub.
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I have treated the room pretty significantly already with good help (Bryan Pape) so I don't think I'm going to do much better.
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Overall though, your response is very good now. I prefer the sub a bit hotter, but that's simple preference.
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That's good to know. As I said, I'll play around with it a bit and see if I can get it any better. But I'm guessing I'm at the point where the differences are not going to be significantly audible?
Just out of curiousity, should that I be aiming to hit the 75dB line, or should the mains fall down the line with the subs? I was wondering if its a function of the type of signal for the sub that is output and whether it has any relevance beyond a certain point...
Craig.