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07-15-2011, 08:26 PM
| | Registered User | | Join Date: Dec 2007 Location: Eastman School of Music | |  B-15 insulation
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Hey all,
I did a quick search (and nothing substantial came up), so I'm sorry if this has been answered before... 
I have a 1970 (I believe) Ampeg B-15, and the yellow insulation on the back of the cabinet is worn, torn, and basically unusable. It looks like it's squished into the bottom of the cabinet.
What is a suitable replacement for this, where would I get it, and how would I install it? I've heard of getting Owens Corning 705, but it's almost impossible to find. I just need a single sheet, too... I don't want to spend $60 for a bundle of fiberglass (or whatever material it is) that I don't need.
Lastly...! Does the fiberglass REALLY affect the sound that much? I don't mean for it to sound ignorant, but I have a recording session very soon and am wondering whether I should be scrambling to find the new cabinet insulation or not.
Thanks!  |
07-15-2011, 08:31 PM
| | Registered User
Owner, Bill Fitzmaurice Loudspeaker Design | | Join Date: Sep 2004 Location: New Hampshire | | Quote:
Originally Posted by dkziemann  I've heard of getting Owens Corning 705, but it's almost impossible to find. | Strip the plastic facing off a 2x4 fiberglass backed ceiling tile. |
07-15-2011, 09:21 PM
|  | Registered User | | Join Date: Jan 2002 Location: Michigan | | | Someone on here told me you can get quilt batting material at Michael's but I couldn't find any at my local store.
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"Rig Of Doom" Thread Originator.
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Keep the Sabbath Dream alive.
Ampeg Portaflex Club #214.
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07-16-2011, 09:48 AM
| | Registered User
Endorsing: Ampeg | | Join Date: Apr 2005 Location: Apopka, FL | | | You should put something on that back wall most definitely. It kills standing waves inside your cab that can make it sound odd.
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07-16-2011, 11:04 AM
| | Registered User | | Join Date: Nov 2007 Location: Central Ky | | | I've got one about that age, it too had matting that was thin and looked worn out. It still sounded good, but was slightly 'boxy' sounding.
After stapling 1" of mattress topper foam on the back and sides walls, and it sounds nice and smooth now. |
07-16-2011, 11:37 AM
| | Registered User | | Join Date: Jan 2002 Location: Michigan | | Quote:
Originally Posted by raytsmith I've got one about that age, it too had matting that was thin and looked worn out. It still sounded good, but was slightly 'boxy' sounding.
After stapling 1" of mattress topper foam on the back and sides walls, and it sounds nice and smooth now. | Side walls also? I may have to experiment with mine as well.
__________________
"Rig Of Doom" Thread Originator.
Nothing runs like a Fender.
Keep the Sabbath Dream alive.
Ampeg Portaflex Club #214.
|
07-16-2011, 01:53 PM
| | Registered User | | Join Date: Nov 2007 Location: Central Ky | | | Yep, I did the side walls too. Can't hurt...just be sure to not block the port on the bottom.
It certainly doesn't look original, but its easily removed. |
07-16-2011, 01:54 PM
| | Registered User | | Join Date: Dec 2007 Location: Eastman School of Music | | | Thanks for everything so far! I've taken a gander at the speaker guide but it seems pretty gargantuan to tackle right now. There is some mineral wool for sale on craigslist in Buffalo, so maybe I'll take a gander at that. Anyone else have any personal favorites that they've tried? |
07-16-2011, 02:13 PM
| | Registered User | | Join Date: Dec 2007 Location: Eastman School of Music | | That's something I'll look into as well. I've been reading about open cell vs closed cell... does the mattress topper fit into open cell? I guess, more importantly, does it sound good? If it does, then I'll go for it!
I've also been looking into these too-- Acoustic Foam 1-1/2" 24" x 18" UL 94 DBR Spkr. Damp.
Anyone use those? |
07-16-2011, 02:22 PM
|  | Registered User | | Join Date: Mar 2007 Location: NYC | | | Yeah the mattress foam works great but that Acoustic Foam looks great to me as well.
Last edited by spellcaster : 07-16-2011 at 02:33 PM.
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07-16-2011, 02:26 PM
| | Registered User | | Join Date: Dec 2007 Location: Eastman School of Music | | | Sweet! Once again, talkbass-- thanks for the help! |
07-16-2011, 03:57 PM
| | Registered User
Owner, Bill Fitzmaurice Loudspeaker Design | | Join Date: Sep 2004 Location: New Hampshire | | Quote:
Originally Posted by dkziemann | Anything specifically marketed as speaker damping will cost more, but it won't work any better. |
07-16-2011, 04:14 PM
|  | Holding the Line, Low, Loud & Proud | | Join Date: Aug 2000 Location: Leander, TX (outside Austin) | | Quote:
Originally Posted by spellcaster | So that's where that design comes from, I was recently in a studio that used that for treatment, when I asked the engineer was, he gave some BS answer, basically he lied.
FWIW I've used foam to replace batting for a long time and prefer the sound and I hate working with fiberglass. |
07-16-2011, 04:33 PM
| | Registered User | | Join Date: Dec 2007 Location: Eastman School of Music | | | Bought the Acoustic Foam from parts express... it's pretty cheap, has good reviews, and seems to do what I need it to!
Last edited by dkziemann : 07-16-2011 at 08:00 PM.
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