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Forum: Dedicated Theater Design & Construction   02-23-2017, 05:05 AM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
Everything could be said to be absorptive,...

Everything could be said to be absorptive, reflective, and diffusive at some frequencies and to some extent; however, for your purposes the answers to both your questions are "no." For most audible...
Forum: Dedicated Theater Design & Construction   02-18-2017, 05:17 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
Back to working on the proscenium. It's not easy...

Back to working on the proscenium. It's not easy going; and if you look too closely you find lots of little problems. Don't look too closely and it's very pleasing to me. I'm sure I will be happy...
Forum: Dedicated Theater Design & Construction   01-31-2017, 05:17 PM
Replies: 997
Views: 83,793
Posted By HopefulFred
But you missed a chance to swing by the new...

But you missed a chance to swing by the new Braves' Stadium! [sarcasm]
Forum: Dedicated Theater Design & Construction   01-26-2017, 01:22 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
Not yet, and there won't be until I also have my...

Not yet, and there won't be until I also have my front wall treatment up. I would like to be able to measure with only one treatment up, but there have just been too many moving pieces to get that...
Forum: Dedicated Theater Design & Construction   01-24-2017, 10:36 AM
Replies: 1,844
Views: 158,905
Posted By HopefulFred
This was a hedge against inflation, right? ;)

This was a hedge against inflation, right? ;)
Forum: Dedicated Theater Design & Construction   01-21-2017, 04:05 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
My "speaker stand" becomes a Helmholtz Resonator...

My "speaker stand" becomes a Helmholtz Resonator (I hope). The modeled performance should be adequate, and represents a series of compromises, as all things. The design to which we built was the...
Forum: Dedicated Theater Design & Construction   01-21-2017, 03:51 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
You're not wrong, per se, but there wasn't much...

You're not wrong, per se, but there wasn't much else to do. The cab is about 18" wide and 16" deep - 3 cuft approx. The top half is pretty thoroughly braced, IMO, and it's built from 3/4" plywood...
Forum: Dedicated Theater Design & Construction   01-20-2017, 05:33 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
Thanks guys. I'm okay with them. And I realize...

Thanks guys. I'm okay with them. And I realize now that I have given you only a partial view to the situation - not to change anything - Just that I see that you all thought the "problem" was with...
Forum: Dedicated Theater Design & Construction   01-19-2017, 05:32 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
I've left this picture a little bit dim and vague...

I've left this picture a little bit dim and vague on purpose - no flash. Really, it's pretty accurate to what the subwoofers look like right now. The question I have, is are they good like this?
...
Forum: Dedicated Theater Design & Construction   01-18-2017, 09:00 PM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
Indeed. And from here it became clear to me that...

Indeed. And from here it became clear to me that we (maybe just me?) have been sloppy in our word choice. Nobody wants localization when it comes to identifying a speaker as the sound source.

What...
Forum: Dedicated Theater Design & Construction   01-18-2017, 04:21 PM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
As Erwin, this is my thought. This is all...

As Erwin, this is my thought.

This is all true, but only conditionally, IMO, as the value of reflections relates to one of your other remarks.

Diffusion, as a variant of reflection, does...
Forum: Dedicated Theater Design & Construction   01-17-2017, 08:15 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
After a productive weekend (just Saturday...

After a productive weekend (just Saturday really), I did some shopping and sent some emails. I was reminded why Roman at rtheaters.com has such a great reputation around the forum. I sent him an...
Forum: Dedicated Theater Design & Construction   01-16-2017, 05:09 PM
Replies: 1,844
Views: 158,905
Posted By HopefulFred
At first glance I thought - How much space is he...

At first glance I thought - How much space is he leaving inside that wall!? Then I saw that the framing pushed toward the existing wall was neither complete nor attached. You've planned to only...
Forum: Dedicated Theater Design & Construction   01-14-2017, 05:05 PM
Replies: 1,691
Views: 95,435
Posted By HopefulFred
Has it really been more than a month since I...

Has it really been more than a month since I posted in this thread?! oops.

I've been futzing around trying to get a good painted finish on my subs, and having really bad results. I don't know why...
Forum: Audio Theory, Setup, and Chat   01-13-2017, 03:45 PM
Replies: 22
Views: 316
Posted By HopefulFred
Indeed. I was expecting in fact that my slightly...

Indeed. I was expecting in fact that my slightly less than infinitely rigid walls would contribute to the modal resonances shifting to slightly lower frequencies, though I don't have a clear idea of...
Forum: Audio Theory, Setup, and Chat   01-12-2017, 07:40 PM
Replies: 22
Views: 316
Posted By HopefulFred
Sanjay's image is a useful visual reference. I...

Sanjay's image is a useful visual reference. I have done the same thing Sanjay has, using the EQ functions built into REW. That places markers on the plots indicating the frequencies of the...
Forum: Audio Theory, Setup, and Chat   01-12-2017, 07:12 PM
Replies: 22
Views: 316
Posted By HopefulFred
Thanks for the links Don. I was unaware of Andy's...

Thanks for the links Don. I was unaware of Andy's work. I'll get into that soon.
Forum: Audio Theory, Setup, and Chat   01-12-2017, 07:10 PM
Replies: 22
Views: 316
Posted By HopefulFred
I appreciate you bringing this thread back up - I...

I appreciate you bringing this thread back up - I need to get back into this process.

As I described in the first post, this is sub only - no speakers.

I have run dozens of model predictions....
Forum: Dedicated Theater Design & Construction   01-10-2017, 05:01 PM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
I'm with you entirely. I've been trying to manage...

I'm with you entirely. I've been trying to manage the same task (not very busy at it). I have measurements in my build thread (and here...
Forum: Dedicated Theater Design & Construction   01-09-2017, 04:44 PM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
I found that getting a helmholtz trap band to be...

I found that getting a helmholtz trap band to be good (above 0.5 absorption coeff or so) was pretty tough below 80 Hz, but I was looking for absorption up to Schroedinger or so also. If you were...
Forum: Dedicated Theater Design & Construction   01-09-2017, 04:41 PM
Replies: 1,844
Views: 158,905
Posted By HopefulFred
Is that going to get you seating for 8? I...

Is that going to get you seating for 8? I forget... have you picked (bought?) seating?
Forum: Dedicated Theater Design & Construction   01-09-2017, 04:36 PM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
Have you tried to configure a Helmholtz for that...

Have you tried to configure a Helmholtz for that band?
Forum: Dedicated Theater Design & Construction   01-07-2017, 09:23 AM
Replies: 11,754
Views: 1,480,777
Posted By HopefulFred
Rattling may prove problematic with bass.

Rattling may prove problematic with bass.
Forum: Dedicated Theater Design & Construction   01-05-2017, 10:11 PM
Replies: 1,844
Views: 158,905
Posted By HopefulFred
I speak from experience when I say,...

I speak from experience when I say, "yes."
Forum: Dedicated Theater Design & Construction   12-09-2016, 11:04 AM
Replies: 30
Views: 564
Posted By HopefulFred
Mass is the primary driver for low frequencies. ...

Mass is the primary driver for low frequencies.

The master thread is probably the best source (within the forums anyway, and maybe anywhere) for information on this topic. Sticky at the top of...
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