dimanata2007 Posted June 23, 2013 Share Posted June 23, 2013 my buddy had a pair of F-1 and was trying to sell them. some guycame and after testing them said they dont sound right because somebody addedinsulation… guy bought speaker anyway but said that he going to pull that foamout as soon as he gets home. I looked inside of my F-3’s which I bought used and wasreally surprised to see dark grey foamy insulation (looks like packing foam tome [*-)])lining bottom and back wall of the cabinet as far as I can see, at least 4-6”above the crossover module. Is it suppose be there? Never disassembled large tower speakers and google didn’t help much eitherso I still have no idea if that insulation in my F-3’s is factory or not. If it is not factory do I need to remove it or it doesn’t reallyaffect anything? Quote Link to comment Share on other sites More sharing options...
Moderators Youthman Posted June 23, 2013 Moderators Share Posted June 23, 2013 I'm not familiar with the F-3 speakers but just about every Klipsch speaker I have opened has foam inside them. It is my understanding that by adding insulation, it not only helps reduce resonances within the cabinet but it also allows the speaker to perform in a smaller inclosure. I know we used to do that back in the day with car audio. If you didn't have the room for the right size sub box, you could add insulation and get away with a slightly smaller box. Here is the inside of the RC-7 Quote Link to comment Share on other sites More sharing options...
Moderators Youthman Posted June 23, 2013 Moderators Share Posted June 23, 2013 Same foam inside the RF-7 towers Quote Link to comment Share on other sites More sharing options...
Moderators Youthman Posted June 23, 2013 Moderators Share Posted June 23, 2013 Klipsch even put foam behind the tweeter of the RF-7. Quote Link to comment Share on other sites More sharing options...
Moderators Youthman Posted June 23, 2013 Moderators Share Posted June 23, 2013 I just found this online.... Pollyfil is a sound absorption, dampening fiber that will deepen bass, provide cleaner midrange, tone down any unwanted reverberation and improve the dynamic extension of any speaker system. It also helps eliminate standing waves, which is something like an echo inside the box. This will give you tighter and more accurate bass. It also helps to give a flatter frequency response to the overall sound, which is good. Besides this, it also helps reduce the vibration of the box, which results in less distortion. There is a big difference to the bass when you have an insulated box. Damping also increases subwoofer efficiency by dissipating some energy that affects the sub, particularly the voice coil. It is advisable to put damping material inside a box. Pillow polyfill and fiberglass insulation are common, though polyfill is a lot easier on your skin. Polyfill also "tricks" a sub into thinking it is in a bigger box. Most sealed and vented enclosures require 1/2 lb. of dampening material per cubic foot of internal enclosure space. For best results it is recommended to loosely fill the material throughout the enclosure. Source(s): A.A.S. degree in Electronics/Industrial Electronics with 25 years in the mobile audio/consumer electronics field Quote Link to comment Share on other sites More sharing options...
dimanata2007 Posted June 24, 2013 Author Share Posted June 24, 2013 ok. thanks alot Youthman. my insulation look different but I'm pretty comfident noe that it is factory stuff. Quote Link to comment Share on other sites More sharing options...
Moderators Youthman Posted June 24, 2013 Moderators Share Posted June 24, 2013 You are welcome, I'm pretty sure it is factory stuff as well. You can always call Klipsch directly to find out for sure. Quote Link to comment Share on other sites More sharing options...
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