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Old 23rd November 2012, 05:25 AM   #461
sayrum is offline sayrum  Germany
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The tml without back panel is imho Not a good idea! Why not add 1/3 of an inch back panel... The bracing (and preety much everything else) is explained in the first post of the thread i linked. Lots of pic, so no worries about language barriers
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Old 23rd November 2012, 06:59 AM   #462
chrisb is offline chrisb  Canada
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Originally Posted by xrk971 View Post
If you leave the back off and use the wall, how do you brace it? This is a good time to ask does anyone use drywall boards to make speaker enclosures? It is cheap and easy to cut. Provides good damping too?

Certainly, drywall board (essentially paper faced baked gypsum paste) has the first 2 characteristics you describe, and as to damping, that could well be, but it lacks any degree of structural integrity, and I'd be very wary of attempting to build an enclosure without a rigid metal or wood skeleton - thereby negating the attempted frugality?

But then again, perhaps folks have had success using it - with careful fabrication, a "functional" enclosure could probably be made from rigid styro-foam insulation boards, or 3 ply corrugated cardboard and duct tape, but how to you securely attach the drivers? - all of these materials are infamous for fragility anywhere near the tight margins that are generally found on loudspeaker drive units' mounting flanges.

of course, I could be talking out of my a$$, so feel free to jump all over the above
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Old 23rd November 2012, 02:37 PM   #463
xrk971 is online now xrk971  United States
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I reinforce the driver mounting screw holes with chipboard glued to the foam core board for screws to have force spread over larger area. Gypsum board speakers could be built with low cost metal framing that drywallers use, can cut with tin snips. The cabinets would be fragile and dropping them would be bad, but look how durable most walls are in homes, you have to hit it pretty hard to break it as we all know if you have punched a wall before with bare knuckles. All techniques used by drywallers can be applied, like spackling compound to smooth joints, painting, etc. Can also make very large architecturally integrated speakers that blend in well.
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Old 23rd November 2012, 04:20 PM   #464
chrisb is offline chrisb  Canada
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Yes, metal studs are light and easy to work with, but the few times I've used them for wall framing (great for initial "tacking" of floor / ceiling plates) they needed a lot of extra work to be as structural secure as a 2x4 wood stud wall. I'd be concerned that without the rigid coupling to house structure that a wall enjoys, a "drywall framed" enclosure would move in all the wrong ways - and as anyone living in an earthquake zone has experienced, it takes not much flexing for taped and mudded seams to crack or blow out completely
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Old 23rd November 2012, 04:25 PM   #465
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[QUOTE=sayrum;3251751]Thanks for the feedback. The tml with the vifa-paper cone is not mine, i just built and liked it. Here

The original for the TML in German did not translate well with google translator. I was able to pick up most with exception of the part concerning stuffing of the enclosure. Could you describe what was done there? Thanks

sandyhooker
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Old 23rd November 2012, 08:02 PM   #466
sayrum is offline sayrum  Germany
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Originally Posted by sandyhooker View Post
... I was able to pick up most with exception of the part concerning stuffing of the enclosure. Could you describe what was done there? Thanks

sandyhooker
good evening,

here in germany we have a speaker damping polyester padding called sonofil.
one packet (fluffed out about ~20l) is enough for two tml. half of a pack (not fluffed) goes in one speaker, filling the first 2/5, a little past the driver. if you feel the bass overpowers the mids + highs some stuffing can be added in the end of the line.

hope this explains it. any more questions feel free to ask.

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Old 23rd November 2012, 09:19 PM   #467
xrk971 is online now xrk971  United States
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[QUOTE=sandyhooker;3253241]
Quote:
Originally Posted by sayrum View Post
Thanks for the feedback. The tml with the vifa-paper cone is not mine, i just built and liked it. Here

The original for the TML in German did not translate well with google translator. I was able to pick up most with exception of the part concerning stuffing of the enclosure. Could you describe what was done there? Thanks

sandyhooker
On post number 9 in thread http://www.diyaudio.com/forums/const...nclosures.html you can see where I stuffed polyester stuffing from an old pillow. About 2/3's of the line. It sounds really nice to my ears with this.
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Old 23rd November 2012, 09:22 PM   #468
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by chrisb View Post
Yes, metal studs are light and easy to work with, but the few times I've used them for wall framing (great for initial "tacking" of floor / ceiling plates) they needed a lot of extra work to be as structural secure as a 2x4 wood stud wall. I'd be concerned that without the rigid coupling to house structure that a wall enjoys, a "drywall framed" enclosure would move in all the wrong ways - and as anyone living in an earthquake zone has experienced, it takes not much flexing for taped and mudded seams to crack or blow out completely
2x4 framing makes sense, pretty cheap still but requires a handsaw at least! Xacto knife is not enough here.
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Old 24th November 2012, 09:09 AM   #469
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Default 5" celestion

Quote:
Originally Posted by Bjohannesen View Post
JH

I have simulated several TB drivers and the 4" i have "tested" are all fit. I can always check for you if you find a driver of interest.

Over time I have simulated several different brands.

The Vifa 3.5" should do very well. However I have not tried it in real life.

Hi
Bjørn
Parts express has a celestion 5" speaker with what seem to be exceptable parameters .cost for each is $8 and the build is very good. cone area is not much larger than the 4" .would it be worth a try ??
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Old 24th November 2012, 10:45 AM   #470
xrk971 is online now xrk971  United States
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Originally Posted by sandyhooker View Post
Parts express has a celestion 5" speaker with what seem to be exceptable parameters .cost for each is $8 and the build is very good. cone area is not much larger than the 4" .would it be worth a try ??
That's a nice looking inexpensive driver. It has a lower top end than I would like (12 kHz) and has only 1.1m xmax, but may be really good with lower Fs and nearly 90 DB efficiency - loud!
I may give it a try for only $8.
Thanks for pointing it out.
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