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Forum: Dedicated Theater Design & Construction   07-01-2016, 07:21 PM
Replies: 11,544
Views: 1,468,153
Posted By BasementBob
You can somewhat compare "703 plain" vs "703 FRK"...

You can somewhat compare "703 plain" vs "703 FRK" at
http://www.bobgolds.com/AbsorptionCoefficients.htm
Forum: Dedicated Theater Design & Construction   06-28-2016, 12:29 AM
Replies: 11,544
Views: 1,468,153
Posted By BasementBob
I don't know. A couple guesses though....

I don't know.


A couple guesses though. The paper on the FRK is quite light, so would tend to reflect only the highest frequencies. I don't have a definition for 'highest' in terms of hz.

...
Forum: Dedicated Theater Design & Construction   06-24-2016, 02:23 AM
Replies: 11,544
Views: 1,468,153
Posted By BasementBob
The FRK will also resonate at some frequency...

The FRK will also resonate at some frequency giving explicit narrow-band membrane behavior that is VERY dependent of the application/mounting itself measurable even with the expected damping, giving...
Forum: Dedicated Theater Design & Construction   04-08-2016, 09:34 AM
Replies: 1,694
Views: 101,473
Posted By BasementBob
Certainly 4 feet of concrete buried under 10 feet...

Certainly 4 feet of concrete buried under 10 feet of earth would do significant suppression of transmission through it of a 20hz tone.
However hat channel and isolation clips, will not affect a 20hz...
Forum: Dedicated Theater Design & Construction   04-08-2016, 09:30 AM
Replies: 1,694
Views: 101,473
Posted By BasementBob
DW is usually drywall. GF is usually glass...

DW is usually drywall.
GF is usually glass fiber (aka fluffy fiberglass pink).
Did you mean something different here?
Forum: Dedicated Theater Design & Construction   04-08-2016, 09:22 AM
Replies: 1,694
Views: 101,473
Posted By BasementBob
re speaker cabinets. One can't use drywall, it...

re speaker cabinets. One can't use drywall, it would shatter and break. One can't use concrete, too heavy. Plastic is too light. Of the various woods, MDF has mass and stiffness and doesn't warp or...
Forum: General Home Theater & Media/Game Rooms   03-21-2016, 04:31 PM
Replies: 8,235
Views: 761,549
Posted By BasementBob
Watched The McKenzie Break (1970)...

Watched The McKenzie Break (1970) (http://www.amazon.com/dp/B004H38LPC)
2.7/5 (amazon 4.0/5, imdb 6.5, rotten tomatoes 52%)
Having some similarities to The Great Escape (1963), this is a battle of...
Forum: Dedicated Theater Design & Construction   03-12-2016, 06:33 PM
Replies: 1,694
Views: 101,473
Posted By BasementBob
You could ask the manufacturer for their opinion,...

You could ask the manufacturer for their opinion, but
the problem isn't the cabinets but what you put into them.
The way resilient channel works is a mass-spring-mass system. There's always an...
Forum: Dedicated Theater Design & Construction   03-10-2016, 10:40 PM
Replies: 1,694
Views: 101,473
Posted By BasementBob
Contact a structural engineer. An engineered...

Contact a structural engineer.
An engineered truss can be a complicated system -- and if you load it in the wrong place, or weaken a part, failure is catastrophic, sudden, and cascading.

...
Forum: Dedicated Theater Design & Construction   03-08-2016, 10:46 AM
Replies: 1,694
Views: 101,473
Posted By BasementBob
He wrote: 5/8"(x1) or 1/2"(x2) The x2 means...

He wrote: 5/8"(x1) or 1/2"(x2)
The x2 means there's half the panels to install.
Forum: Dedicated Theater Design & Construction   03-08-2016, 01:46 AM
Replies: 1,694
Views: 101,473
Posted By BasementBob
That's easy. Soundproofing rule of...

That's easy.


Soundproofing rule of thumb: Which weighs more? Double the mass = about 6dB more isolation. Note: not all 1/2 drywall is the same density.


Cost rule of thumb: it's not...
Forum: Dedicated Theater Design & Construction   03-08-2016, 01:17 AM
Replies: 1,694
Views: 101,473
Posted By BasementBob
Re resilient channel, vs clips (e.g PAC RSIC-1),...

Re resilient channel, vs clips (e.g PAC RSIC-1), vs double stud.

I haven't looked in a decade, but in lab tests, the rubber damped clips used to routinely outperform resilient channel. They...
Forum: Dedicated Theater Design & Construction   03-07-2016, 03:47 PM
Replies: 1,694
Views: 101,473
Posted By BasementBob
The way they do it for the lab test, indeed for...

The way they do it for the lab test, indeed for most lab tests, is to build the wall(s) separately, and then move the wall into the test gap (sort of a empty doorway) on testing day. Thus one would...
Forum: Dedicated Theater Design & Construction   03-07-2016, 02:00 PM
Replies: 1,694
Views: 101,473
Posted By BasementBob
How do you build that? One of those innermost DW...

How do you build that? One of those innermost DW is hard to screw to the 2x4s. The quadruple leaf wall is 'fun' to build.

http://www.bobgolds.com/WallCharts/QuadTripleDoubleLeafSTC.htm
Forum: Dedicated Theater Design & Construction   03-06-2016, 09:08 PM
Replies: 319
Views: 12,645
Posted By BasementBob
That rockwool is denser (weighs more per volume)...

That rockwool is denser (weighs more per volume) than fiberglass is irrelevant to it's absorption. Within a single material changing density has effects, but you shouldn't compare two different...
Forum: Dedicated Theater Design & Construction   03-03-2016, 05:55 AM
Replies: 319
Views: 12,645
Posted By BasementBob
There's a measurable difference. See...

There's a measurable difference. See http://bobgolds.com/AbsorptionCoefficients.htm

There's not a lot of audible difference, for many of the things on that page.



Usually, yep. If you...
Forum: Dedicated Theater Design & Construction   03-02-2016, 10:47 PM
Replies: 11,544
Views: 1,468,153
Posted By BasementBob
Doesn't make much difference. I assume the...

Doesn't make much difference. I assume the 'non-fiberglass' is the same ultratouch mentioned here http://www.bobgolds.com/AbsorptionCoefficients.htm

From an acoustics perspective, if you can...
Forum: Dedicated Theater Design & Construction   02-28-2016, 05:22 PM
Replies: 319
Views: 12,645
Posted By BasementBob
Who on earth calls it that? It's called...

Who on earth calls it that?

It's called 'fluffy pink' or 'fluffy fiberglass pink' ! :)

'pink fluffy', harrumph
Forum: Dedicated Theater Design & Construction   02-15-2016, 09:16 PM
Replies: 1,005
Views: 63,708
Posted By BasementBob
I went rummaging through the cupboard and found...

I went rummaging through the cupboard and found the box. It says my Harmony was 2005.
Forum: Dedicated Theater Design & Construction   02-15-2016, 06:04 PM
Replies: 1,005
Views: 63,708
Posted By BasementBob
I gave up on my Harmony Remote years ago and put...

I gave up on my Harmony Remote years ago and put it back in the box.
Harmony was great at moving between a few simple states, but the moment I did something manually it got lost -- and since I'm...
Forum: Dedicated Theater Design & Construction   02-15-2016, 05:39 PM
Replies: 11,544
Views: 1,468,153
Posted By BasementBob
Keenly: I suppose you could use absorption to...

Keenly:
I suppose you could use absorption to take care of the high frequency reflection problems, and equalize each speaker independently to deal with the low frequency wall boost issue. No one's...
Forum: Dedicated Theater Design & Construction   02-13-2016, 07:20 PM
Replies: 1,694
Views: 101,473
Posted By BasementBob
No. Usually one uses finishing nails, covered...

No.
Usually one uses finishing nails, covered with white caulk, then painted.



Yes.



Yes.
Forum: Dedicated Theater Design & Construction   02-12-2016, 05:50 PM
Replies: 1,694
Views: 101,473
Posted By BasementBob
DIY experiment thought On last week's...

DIY experiment thought
On last week's Mythbusters, they were lifting up cars with a vacuum.
In the boxes they finally made, they made a mold affixed to the box for a rubber seal, and poured liquid...
Forum: General Home Theater & Media/Game Rooms   02-04-2016, 02:34 AM
Replies: 8,235
Views: 761,549
Posted By BasementBob
Watched Hyena Road (2015)...

Watched Hyena Road (2015) (http://www.amazon.ca/dp/B016HHKX7O)
3.9/5 (amazon 4.6/5, imdb 6.6/10, rotten tomatoes 76%)
One of the best modern warfare movies I can recall, set in Afghanistan in this...
Forum: General Home Theater & Media/Game Rooms   01-25-2016, 04:41 PM
Replies: 8,235
Views: 761,549
Posted By BasementBob
Watched The Martian (2015)...

Watched The Martian (2015) (http://www.amazon.com/dp/B01866YS0M)
4.3/5 (amazon 4.4/5, imdb 8.1/10, rotten tomatoes 93%, AVS Ralph Potts: No Stars AVS Bug...
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