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Post by Darren on Jul 28, 2006 10:43:32 GMT -7
Related to my house curve, it brings down a hump near the crossover frequency and moving it to 100Hz kept it from affecting the lower frequencies much.
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ryans
Full Member
Posts: 132
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Post by ryans on Jul 28, 2006 19:37:05 GMT -7
Good info. Here are my filters: 25Hz 20/60 -4 32Hz 6/60 -7 50Hz 10/60 +7 63Hz 4/60 +12 80Hz 21/60 -10 100Hz 13/60 -12 Yeah, those are some pretty drastic filters. You can use Behringer's DSP1100 simulator to see the composite response and how the filters affect each other. Here's a summary of the major peaks and dips: -8dB @ 32Hz +6dB @ 50Hz +8dB @ 63Hz -15dB @100hz That covers a lot of boost/cut range. At least the boost you've dialed in at 63Hz is damped a bit by the wide cut at 80Hz. Do these filters really get you a flat response? Have you tried taking measurements at other listening positions? When I enter my EQ settings into the simulator I see a max range of +6 to -7. That's a little more boost that I would have liked, but compared to my 1st gen SVS (which I was happy with) I figure I have about 9dB more headroom. If what you're dealing with is a true null, then throwing lots of gain at it is a useless gesture and can only cause other problems (like clipping the amp and/or messing up the response in other listening positions) Your choices at this point are to move the subwoofer (a decidedly difficult task with an IB), move the listening position, treat the room, or live with the response you're getting. BTW, when the FAQ deals with the topic of EQing, I think it recommends to only use cut filters or maybe small gain filters. This implies what I said above. Hopefully those furniture changes will help you out.
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Post by soho54 on Jul 31, 2006 15:24:33 GMT -7
Darren - If the LFE is at -10, what is the sub level at?
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Post by v1rtu0s1ty on Aug 2, 2006 21:58:58 GMT -7
Hi Darren, I'm not an IB owner right now. I would like to know in layman's term what's going on with your setup. I'm just worried that your situation might happen to me when I start my IB. Aren't you happy with the way it is performing? Isn't it clean/fast? Do you think your room is being pressurize by your IB? I just want to know because I might spend lots of money on drivers and amps and just resulting in just an OK performance. I hope you understand me.
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Post by chrisbee on Aug 3, 2006 1:02:34 GMT -7
Hi Darren, I'm not an IB owner right now. I would like to know in layman's term what's going on with your setup. I'm just worried that your situation might happen to me when I start my IB. Aren't you happy with the way it is performing? Isn't it clean/fast? Do you think your room is being pressurize by your IB? I just want to know because I might spend lots of money on drivers and amps and just resulting in just an OK performance. I hope you understand me. Just avoid using boost filters. The best idea in Darren's situation is to have the IB's raw response curve humped too high on the REW graph. This will probably happen naturally with an IB thanks to room gain and other physical factors. Then you pull the broad hump back down to your target curve with medium-broad negative BFD filters. The troughs disappear as if by magic and you use all your amp power to move your cones without clipping. Dragging the hump down may even give you some extra VLF extension if you carefully avoid the 20 - 30Hz area with severe negative BFD filters. Be guided by the REW graph but remember to test again afterwards. I wanted more infrasonics from my IB. So I added a full boost filter at 20Hz on the BFD. Then I pulled the inevitable hump down to the target curve with broad higher frequency filters. As frequency falls you need less power to move the cones so you gain down low without stressing your amp. There are other (possibly better) ways of getting a house curve if you check the REW FAQ at the HT Shack. I have never seen my amp clipping lights come on.
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Post by Darren on Aug 3, 2006 6:45:25 GMT -7
Chrisbee is right,
My large boost between 55 and 65Hz is what was clipping my amp. I was trying to fill a room null which isn't a good idea. I've since dialed down my boost in those frequencies and have more bass than I can handle and a slight null but I'm working on treating that.
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Post by jagman on Aug 3, 2006 22:37:21 GMT -7
This is really good advice, guys. I've been following this forum for years and for whatever reason the last two posts nailed the basic concept of subwoofer EQ better than I've read to date. Thank you.
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