DIYSG 1099 & HT8 Build - absorption question - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 12-12-2019, 07:03 PM - Thread Starter
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DIYSG 1099 & HT8 Build - absorption question

I'm gathering material for my 1st DIY speaker build. Yeah!

DIYSG build instructions recommend 2"-3" of denim insulation for lining the ported woofer cavities of the 1099 (mains) and the HT8 I'm using as surrounds. I bought this from HD. https://www.homedepot.com/p/UltraTou...6482/202710055

This insulation is listed as 1.6" thick - one layer is less than the DIYSG recommendation (<2"), and two layers are more than the suggested thickness (>3"). How important is it to be between 2-3 inches? Should I make sure not to use less than 2", and not more than 3"?

I could try to split the 2nd layer batting to end up in the recommended range, but that's more work and I'm guessing more of a mess.

What does everyone recommend?

Thanks for the help.
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post #2 of 9 Old 12-12-2019, 07:10 PM
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Use one layer on the HT-8, you can probably get away with one layer on the 1099 as well, or if you want double it up on the back panel.
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post #3 of 9 Old 12-12-2019, 07:15 PM
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1 layer in HTM6

note bottom "empty" for port clearance

horn section got some poly fill -medium light packed- behind the horn
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post #4 of 9 Old 12-12-2019, 07:56 PM
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JBL M2 only uses a thin layer of this black material. It covers everything except the internal bracing.

I figure if they didn’t add any more, than it wasn’t necessary. Obviously they weren’t trying to cut corners.

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post #5 of 9 Old 12-14-2019, 05:24 PM - Thread Starter
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Thanks for the responses so far everyone.

@mtg90
It seems like you might recommend more than the one layer (1.6")? If i should go thicker, I'll do whatever I need to do get the best result. You're much more experienced than me. Do you recommend going 2 layers thick, or is more not always better? I'm trying to learn, so any info is appreciated. I could also go one layer then add some Acousta-Stuf that I bought to fill the 1099 mid section, or strip down the denim insulation to an inch or so before installing. Or something different all together?

@tuxedocivic or @Erich H
Do either of you have any advice to share?

(I hope it's ok to call on specific forum members this way. I'm pretty new to this.)

Thanks again.
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post #6 of 9 Old 12-14-2019, 11:19 PM
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Here is the info for the 1099:

Quote:
Use fiberglass insulation or pillow polyfill to line the cabinet walls. There are other available materials such as Owens Corning 703, denim insulation, open cell foam, etc. If you're not sure, use the guts of a cheap pillow. Line it on the interior of the cab using staples or spray adhesive or some form of attachment. Keep it clear of the ports and the basket area of the woofer. You don't want any getting tangled in the woofer.
For the mids chamber, you can stuff it much more full. Even if the entire chamber consists of stuffing with just a little space behind the mids, that's good.

So the 1.6" R6.7 ultratouch is just fine for the HT-8 and 1099 woofer sections. For ported cabinets you really only need enough to cut down on the internal reflections in the cabinet from the back wave, any more then that and it will start to hurt the bass response.

When I typed up the HTM build thread I hadn't seen the R6.7 stuff in person so I didn't really know how thick it was (I somehow thought it would be thinner then it is). I've since switched to primarily using that stuff since it will work for lining most cabinets. The R-13 or R-15 ultratouch was often overkill especially for smaller ported cabinets and speakers.
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post #7 of 9 Old 12-15-2019, 07:31 AM - Thread Starter
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Quote:
Originally Posted by mtg90 View Post
Here is the info for the 1099:




So the 1.6" R6.7 ultratouch is just fine for the HT-8 and 1099 woofer sections. For ported cabinets you really only need enough to cut down on the internal reflections in the cabinet from the back wave, any more then that and it will start to hurt the bass response.

When I typed up the HTM build thread I hadn't seen the R6.7 stuff in person so I didn't really know how thick it was (I somehow thought it would be thinner then it is). I've since switched to primarily using that stuff since it will work for lining most cabinets. The R-13 or R-15 ultratouch was often overkill especially for smaller ported cabinets and speakers.
Perfect. Thanks for sharing the why behind the advice. On to the build!
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post #8 of 9 Old 12-23-2019, 11:32 PM
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How is your build coming? I am building the same kits.
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post #9 of 9 Old 12-26-2019, 07:01 AM - Thread Starter
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I haven't had a chance to start yet unfortunately. We're traveling for the holidays. I'll get started after the New Year and post progress as I go.

Have you started? How's it going?
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