Is placement that important when using two subs in room to cancel out standing waves? - Page 2 - diyAudio
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Old 14th May 2004, 07:54 PM   #11
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I know it is a sin, but right now I am actually sort of missing out on some bandwidth. I have a medium/small room with my home-made little Tang Band identical sattelites all the way around consisting of nothing more than a single 871 in each speaker. I know that sounds minimal, but if you heard what it is capable of, you would understand why I am more than content with these for now. Unfortunately I will occasionally hear a driver bottoming out at extremely (and I do mean EXTREMELY, these little puppies really put out, more than you think) high volume levels, so I have my Sony STRDA777ES receiver set to cross them over at 120hz at (another apparent travesty, I know), 12 db per octave. My subs consist of two Vifa 8" drivers per box, and I don't want to cross them over any higher than 80hz. I know this sounds like treason, but you really can't tell that you are missing out on much more than you were before, and the difference would probably be noticable if I were using larger speakers, but right now these sound so good for what they are that I really don't care. And as easy as these were to make, it just makes me care even less. I'll have to post a picture of my so-easy-it's-almost-cheating design on here sometime.
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Old 14th May 2004, 08:08 PM   #12
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Originally posted by The Paulinator
My subs consist of two Vifa 8" drivers per box, and I don't want to cross them over any higher than 80hz.
Out of curiosity why do you not want to cross them higher, especially since it sounds like you have 2 subs which could be run as stereo subs close to the mains?
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Old 16th May 2004, 11:55 PM   #13
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I always hear plenty of localization above 80hz, it seems, and that drives me nuts when there is something coming from the back speakers, but it's lower frequencies are coming from the front of the room. Realism goes out the door.
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Old 17th May 2004, 06:30 AM   #14
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there is a recording technique using boundary microphones, which involves the mic capsule placed on a level with the wall (boundary). This removes the possibility of comb filtering from reflections from that wall and also the possibility of the standing wave effecting the signal. A standing wave will always have a SPL of zero at the boundaries. So put the subs directly behind the fullrange speakers according to line of sight as close to the wall as possible. Putting the speakers next to the wall also causes the proximity effect, which is not too unfortunate with a sub, becuase you just don't have to push them as hard to get the same level of sound. If you place them line of sight running in stereo and if you're obsessive put a delay on the full ranges of a couple of milliseconds then you should get a good result with as high a crossover point as you want. The only way to get rid of a standing wave properly though is to either build your room an asymmetrical shape, or use loads of bass traps and soft furnishings.
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