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In Reply to: RE: Tell us the most obscure tweak you know of that works: posted by Smelly_Socks on October 06, 2016 at 16:14:56
An almost free tweak anyone with rear firing speaker ports can try. I'm not a huge fan of ported speakers, many tend to chuff. That said a speaker I really like and often recommend is front ported and doesn't suffer from this issue whatsoever so not all ported designs are bad or need tweaking.
A sub I often recommend and happen to own a pair of are rear ported, twin ports to be exact, and with my room's issues this was causing me problems. I tried different things, one being bass traps but I'll get back to that in a minute. Another was stuffing the ports with socks, thought about big rubber stoppers but I've tried those in the past with smaller ports on regular speakers and they just don't sound right.
Well the answer should have been obvious, I guess the only reason I never thought of it before was the ports were always much smaller. I'm not sure why it works so much better than the rubber stoppers, maybe the flexibility of the material being so thin? I don't know, I just know it works, one day I plan on painting them black lol. They wedge in pretty tight so no worry about them flying out.
As for the bass traps, these were left in place as a final tweak, and have a very high WAF, silk plants strategically placed around the back and sides of the speakers.
Edits: 05/01/17Follow Ups:
I think one reason for the 'chuffing' is turbulent flow in the ports. Another way you can address this is to fill the port with drinking straws, so the port looks a bit like honeycomb - I've done this on a few different subs and it usually works well. ymmv.
The problem I'm having with the rear ports on the sub have nothing to do with chuffing and why I didn't mention the straw technique. It's more an issue with the ports on the left speaker facing into a corner causing it to get a bit boomy.
I've tried the drinking straw idea before on a pair of Optimus Pro X77's that were hooting through the ports at certain frequencies, also the rubber stoppers, neither worked well. Tried a few other methods of plugging the ports but was never satisfied with the results. I ended up making some other more drastic changes to the Pro X77's that eliminated the issue without any changes to the ports.
Martin
Edits: 05/01/17
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