Re: [SlimDevices: Audiophiles] subwoofer reponse
Subwoofer placement is crucial. Bass frequency sound waves are big, on the order of several feet. They strongly interact with each other - if a peak hits a trough, they will cancel each other out. If a peak hits a peak, they will reinforce each other, producing overblown, boomy bass. The bass you hear from a sub is a combination of direct sound and reflected sound. Depending on your sitting position, you could be in a zone of destructive interference (cancelled bass) for several critical frequencies. Since the wavelength is different, the zones of constructive and destructive interference move around for differerent frequencies. Here's something simple you can do - place the sub in your listening position and start listening to bassy material. Make sure no one's around because the next step is embarassing...pretend you're a sub! Move around with your ear in the same position as the driver. Investigate along walls and corners. You will find that the sound changes, you'll get boominess and cancellations as you move along. Settle on the best spot, where there's little boominess but no cancellation either - you'll have to judge. Then move the sub to that position. You can also investigate the Inguz plugin. However it's best to get placement right first, then use things like Inguz to go that extra (small) step. -- Mark Lanctot It's like, you know, a New Age religion, but with better treble response. - Jon Heal Mark Lanctot's Profile: http://forums.slimdevices.com/member.php?userid=2071 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
chiefersone;181318 Wrote: I'm looking at achieving the most/best subwoofer response from an older Difinitive 1500 subwoofer through an older Adcom GTP600 tuner/preamplifier. My SB is attached to the Adcom of course... I have a large hard wood spacious room and I can't get the response from the sub that I could in my downstairs room that was carpeted and hooked through a low end Denon A/V receiver. The subwoofer should be putting out more than enough bass for any application. I don't understand Have you read up on the subject? Perhaps large room has something to do with this problem? http://www.google.co.uk/search?q=subwoofer+placement -- P Floding No, I didn't ABX it. And I won't even if you ask me. (Especially not if you ask me.) P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
Mark Lanctot wrote: Bass frequency sound waves are big, on the order of several feet. They strongly interact with each other - if a peak hits a trough, they will cancel each other out. If a peak hits a peak, they will reinforce each other, producing overblown, boomy bass. To reinforce what Mark says, the speed of sound is roughly 1000 feet per second, the low E string on a bass guitar is ~~ 41 HZ. Simple arithmetic shows that the wavelength of a low E note is 1000/41 ~= 20 feet. So bass notes, without even getting into organ pedal tones, are really long. And when the wavelength is the same as a dimension of your room, or even a multiple of the dimension, it is very bad. The low E string on a standard guitar is ~ 82 HZ, which is about 12 feet. Up half an octave, and you are right at the 8 foot ceiling height of millions of rooms all over America -- Pat http://www.pfarrell.com/music/slimserver/slimsoftware.html ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
Put your sub in your listening position, thencrawl around and listen for the best response, thats where you put the sub. (ups, already mentioned, sorry.) You didnt reverse the phase on the sub by mistake ? -- Anne Anne's Profile: http://forums.slimdevices.com/member.php?userid=10071 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
Anne;181352 Wrote: You didnt reverse the phase on the sub by mistake ? Good point - reversing the phase will cause constructive and destructive zones to trade places. -- Mark Lanctot It's like, you know, a New Age religion, but with better treble response. - Jon Heal Mark Lanctot's Profile: http://forums.slimdevices.com/member.php?userid=2071 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
Mark Lanctot;181355 Wrote: Good point - reversing the phase will cause constructive and destructive zones to trade places. That sounds wrong to my scientific ears. Without researching the subject closer, I admit. -- P Floding No, I didn't ABX it. And I won't even if you ask me. (Especially not if you ask me.) P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
P Floding;181357 Wrote: That sounds wrong to my scientific ears. Without researching the subject closer, I admit. Well, where there's a peak, there will be a trough when you reverse the phase. -- Mark Lanctot It's like, you know, a New Age religion, but with better treble response. - Jon Heal Mark Lanctot's Profile: http://forums.slimdevices.com/member.php?userid=2071 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
Mark Lanctot;181359 Wrote: Well, where there's a peak, there will be a trough when you reverse the phase. No, there won't. There will be a peak of opposite polarity. -- P Floding No, I didn't ABX it. And I won't even if you ask me. (Especially not if you ask me.) P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] subwoofer reponse
P Floding;181364 Wrote: No, there won't. There will be a peak of opposite polarity. Yes, you're right. Edit coming up. -- Mark Lanctot It's like, you know, a New Age religion, but with better treble response. - Jon Heal Mark Lanctot's Profile: http://forums.slimdevices.com/member.php?userid=2071 View this thread: http://forums.slimdevices.com/showthread.php?t=32851 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
