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Building An Extension - External Wall Construction

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Re: Building An Extension - External Wall Construction

PostPosted: Mon Sep 06, 2004 7:10 pm
by Driller
Thanks for all that Tim! If I may though, the two resonant bass traps in the live room, are they a similar design to Ethan's panel traps or some other design. And is there a rear panel or are the frames simply pressed/sealed against the wall? Also, the Helmholtz's in the control room, did you just choose a "standard" frequency to have them made to absorb, or was it the software agin which told you? Finally, to realy push my luck, did you make the traps yourself or did you buy them (guessing you made them :))

Thanks for indulging me!

D

Re: Building An Extension - External Wall Construction

PostPosted: Tue Sep 07, 2004 6:41 pm
by Tim.
>Thanks for all that Tim!

My pleasure Driller.

>If I may though, the two resonant bass traps in the live room, are they a similar design to Ethan's panel traps or some other design.

Mine are basically airtight sealed boxes (approx: 100 x 160 x 10cm deep) made of wood and filled with Rockwool with an air gap so the front resonant plywood panel doesn’t touch the Rockwool. They also have a larger frame around them that is dressed with a thin fabric to improve looks.

They have a fairly wide resonant centre frequency (approx 40 to 100Hz) and the overall response curve looks like a parabola, or bell curve, with the top of the curve slightly flattened.

Interestingly, the control room resonant panel traps, under the main monitors, use the same plywood fronts (albeit much smaller front panels but larger cubic capacity internally) but they exhibit a definite and much narrower centre frequency of approximately 48Hz and are –2dB at 96Hz, -8dB at 160 to 315Hz and –20dB at 500 to 800Hz. The response curve looks much more like a staircase.

>And is there a rear panel or are the frames simply pressed/sealed against the wall?

They are completely dismountable self-contained units hanging on the wall; don’t know how much they weigh but they are definitely a two-man job to lift. To maintain an airtight box all joints were: glued, screwed and covered with a generous quantity of flexible mastic.

Due to space limitations (depth) the Helmholz traps in the control room are fixed directly to the wall and sealed airtight to the wall with flexible mastic.

>Also, the Helmholtz's in the control room, did you just choose a "standard" frequency to have them made to absorb, or was it the software agin which told you?

No, not the software, I made ‘em before testing the room. My aim was to make traps that would respond to frequencies not covered by the other traps. The calculated frequencies they should be responding to are: 205,322,404,450 and 491Hz

I’d forgotten (memory error ;)) to say previously that I also used a DSP8024 RTA and ECM8000 test mic in the control room; a couple of very capable Behringer products; as a company, their products are frequently unfairly maligned.

>Finally, to realy push my luck, did you make the traps yourself or did you buy them (guessing you made them

Living on a fairly small and distant island, importing huge ready made traps would have cost a small fortune… so, the mother of invention lent me a hand in their construction ;)

>Thanks for indulging me!

You’re welcome sir. Now then, about those crowns… ;)

Tim ;o)

Re: Building An Extension - External Wall Construction

PostPosted: Tue Sep 07, 2004 10:57 pm
by Driller
[quote You’re welcome sir. Now then, about those crowns… ;)

Tim ;o) [/quote]

Heh, heh. Tell you what, come and make my new basement look like your studio and I'll see what I can do ;)

cheers
Driller

Re: Building An Extension - External Wall Construction

PostPosted: Wed Sep 08, 2004 7:24 am
by Tim.
>(approx: 100 x 160 x 10cm deep)

Ahem... sorry, user error... that should have read: approx: 100 x 160 x 18cm deep

I’d love to come and help Driller but I couldn’t find Paris on my map of Crete ;)

Tim ;o)