MyNameIsNoob Posted December 27, 2015 Report Posted December 27, 2015 Ok I've only recently felt the urge to increase my understanding of the forces at work in my listening experience, so forgive me if this is an elementary question... but, how important is reducing standing waves inside the enclosure in the big picture? Ive always been under the belief that parallel walls will create a "pocket" of air so i have always made sure to have one of the sides slightly angled to help w this, but I see so many people who don't seem to care much ab this based on the pics n vids of their ride, but I've always been an advocate of the little things that matter, so id love to hear from some who share this mindset w me... Thx in advance!
hdorre Posted December 27, 2015 Report Posted December 27, 2015 The fear of "dead space" caused me to redo the top of my shell for peace of mind. On 5/8/2011 at 7:38 PM, Kranny said: On 5/8/2011 at 7:35 PM, 'Maxim' said: It hurts me inside when I read stuff like this and remember you're 15 LMFAO so true Mitsubishi 3000GT (Old Build) Headunit: Pioneer 80PRS Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s Electrical :Singer 260A Alt & JY Power Lithium 2005 Chevy Colorado Ext Cab Headunit: Pioneer 80PRS Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s Electrical: Singer "390" and JY Power My Official Feedback Thread
Triticum Agricolam Posted December 27, 2015 Report Posted December 27, 2015 It depends on the size of the box. The frequency at which standing waves occur depends on the distance between box panels. The closer panels are, the higher the frequency needs to be for standing waves to occur. For a standing wave to occur the distance between panels has to be equal to or greater than a half wavelength of the frequency being produced. Since the frequencies car subwoofers produce are so low, the wavelength distance is large enough that standing waves generally are not a problem (though not always). For example, at 100 hz the have wavelength distance is about 68". Since car subwoofers generally don't play as high as 100 Hz, and generally have dimensions smaller than 68", standing waves are rarely a concern. Now if you are building a box for home audio speakers than are going to be playing the full audio range of frequencies, standing waves definitely need to be considered. Angling opposite panels are one way to address it, lining the interior of the box with a damping material is another. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
MyNameIsNoob Posted December 29, 2015 Author Report Posted December 29, 2015 Ok cool. I wasn't sure how exactly that "pocket" worked since sound waves radiate, wrap and reflect, but it makes alot of sense the way you explained it. Thank you much!
MyNameIsNoob Posted December 29, 2015 Author Report Posted December 29, 2015 Also, I had this "theory" in my head (dangerous for a noob lol) that is similar to angling one of the panels. I've never saw it done, but w the amount of fine tuning and expiramentation in car audio I'm willing to bet someone has... So imagine a rectangular box w all sides being parallel, except the panel behind the sub is curved or slightly bulged. Would this be more effective at a wider range of frequencies being that the reflective angle is variable?
Triticum Agricolam Posted December 29, 2015 Report Posted December 29, 2015 Also, I had this "theory" in my head (dangerous for a noob lol) that is similar to angling one of the panels. I've never saw it done, but w the amount of fine tuning and expiramentation in car audio I'm willing to bet someone has... So imagine a rectangular box w all sides being parallel, except the panel behind the sub is curved or slightly bulged. Would this be more effective at a wider range of frequencies being that the reflective angle is variable? Short answer is "no". The reason angling a panel works is it prevents sound waves from bouncing back and forth repeatedly. Think of two mirrors facing each other, same concept. When you angle one of the mirrors the cool effect is gone. Same thing with sound waves. While a curved panel would work, it wouldn't be any more effective and an angled panel. The angled panel works for all frequencies anyway. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
MyNameIsNoob Posted December 29, 2015 Author Report Posted December 29, 2015 So youre saying its the same principle, but not worth the trouble, correct? I imagine short of fitment or cosmetic reasons?
Triticum Agricolam Posted December 29, 2015 Report Posted December 29, 2015 So youre saying its the same principle, but not worth the trouble, correct? I imagine short of fitment or cosmetic reasons? Yeah, pretty much. It wouldn't be worth the effort. Really angling panels on car subwoofers boxes isn't worth the trouble either. Standing waves just aren't a big problem for most car audio subwoofers. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
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