Acoustical Treatments Master Thread - Page 144

Originally Posted by Dennis Erskine

As an FYI, there is a new product (a couple actually) from Quest Acoustical Interiors (www.questai.com), ... no I don't work for them.

Perf-Sorber is a combination absorber/diffuser in a single fiberglass panel. An excellent early reflection point product speakers with good off axis response. Also, a good choice around surround speakers. The other (I forget their trade name) is a product with very good absorption down to 150Hz.

Originally Posted by will1383

I'm going to be hard pressed to fit anything in the front of the room

my speaker stands which double as bass traps (can fill them with sand).

would you suggest moving the subwoofer to the rear of the room where I'll have a couple of bass traps in the corners

would you also recommend against a second subwoofer?

Originally Posted by Ethan Winer

Wall-floor and wall-ceiling corners are just as good as wall-wall corners.



A tube filled with sand is not a bass trap.



Sub location and bass trap location are not really related. If you can post a photo of your room I may be able to suggest something.



I do fine with one killer SVS sub and a huge amount of bass trapping, but some people are happy with two subs.

--Ethan

Thanks, but I could not find the Perf-Sorber

Originally Posted by will1383

I thought that a sand filled tube would suffice as partly a bass trap, but, I figured that something wasn't quite right about that.

I might put 4" of 703 on the front wall instead of 2 just to help with the lower frequency absorbtion.

They are wood, would mass loading the inside of them help absorb some of the low frequencies?

Originally Posted by (Berk)

If I'm not worried about sound isolation, only a good sounding room, wouldn't it also work to just not drywall the bottom 48" of all the walls?

can anyone tell me if eggcarton shaped foam is a good idea to put on my sloped concrete ceiling?

Originally Posted by Ethan Winer

Drywall, cement, it's all the same - reflective. If you want the room to sound good what you really need are corner bass traps, plus absorbers at the side-wall and ceiling reflection points.



It depends on the quality and thickness of the foam. Generally speaking, better treatments are made from rigid fiberglass.

--Ethan

Originally Posted by (Berk)

So if drywall and cement are both reflective, there is no benefit to drywall the areas that will be covered up with treatments anyways?

Okay thanks, that will save me some time and money.

Originally Posted by (Berk)

If I'm not worried about sound isolation, only a good sounding room, wouldn't it also work to just not drywall the bottom 48" of all the walls? Could I shove regular insulation in there, then some linacoustic (if it is needed?) and then fabric? Then I only have to drywall the top portion.

The one shared wall on the other side of the 8 inch concrete wall is 2X6 framed, and drywalled too.
Thanks,
Berk

Originally Posted by ScruffyHT

Are you going to have the room inspected by the city ? ( electrical etc ? )

Originally Posted by eugovector

Keep in mind that you want the room to be insulated for heat/ac as well as sound. Don't want to be sweating/freezing while you're watching movies.

Originally Posted by (Berk)

So if drywall and cement are both reflective, there is no benefit to drywall the areas that will be covered up with treatments anyways?

Originally Posted by Ethan Winer

Yes, assuming you mean using Liquid Nails etc to glue drywall flat onto the cement. In that case it's bunch of work for no acoustic gain. But making a new stud wall inside the cement wall can help (a little) with acoustics, and that can add thermal insulation too as eugovector said.

--Ethan

Originally Posted by (Berk)

No, I have a 4 concrete walls that I've framed a new stud walls inside which will be fully insulated.

I am asking if it is okay to drywall only the top half of the walls and put fabric wrapped linacoustic (without drywall) on the bottom 48"? My thought is, what is the point of putting drywall on the bottom 48" if I'm going to cover it with accoustical treatment anyway? I'm not concerned about sound isolation.

Originally Posted by (Berk)

No, I have a 4 concrete walls that I've framed a new stud walls inside which will be fully insulated.

I am asking if it is okay to drywall only the top half of the walls and put fabric wrapped linacoustic (without drywall) on the bottom 48"? My thought is, what is the point of putting drywall on the bottom 48" if I'm going to cover it with accoustical treatment anyway? I'm not concerned about sound isolation.

Originally Posted by (Berk)

I am asking if it is okay to drywall only the top half of the walls and put fabric wrapped linacoustic (without drywall) on the bottom 48"? My thought is, what is the point of putting drywall on the bottom 48" if I'm going to cover it with accoustical treatment anyway? I'm not concerned about sound isolation.

Originally Posted by pepar

Those here with the knowledge and experience who could put something like that together are professional consultants, with "professionals" meaning "they work for money." That they answer questions at all for free is greatly appreciated. I am afraid that you will need to research this material on your own - like the rest of us have - or step up and hire a pro.

Originally Posted by Erik Westlund

Thanks Pepar for your response. But I feel you have misinterpreted my message a little. It would not intend to weaken the consumer/client relations. I think it would enrich it.

I am in the A/V retail sales industry. And I have been for years. I see with both a consumer-client point of view (it's my hobby) AS WELL as the sales side of things. I always appreciate a more knowledgeable client when I meet one. It makes for a better level of communication. Even if they have the basics down... just a little. I can better understand their motives and interests. It also makes their efforts easier, as well. Since this is a technology based language. It seems obvious to me that one must understand the basics before they can communicate with a more experienced individual.

Often times, a client may not have the full or correct information from what they have learned. But that's OK if they have not executed that idea yet. After talking with a professional, they will be more aware and appreciative of their help and knowledge. They will realize that there is a whole lot more to know. When the client has taken the initiative to attain some knowledge on their own. They then realize it can't be done on their own if they want to do it right and/or done in a reasonable amount of time.

With the intent of this "outline- a/v bible", most of these basics can be covered. This should minimize a level of forum redundancy and advance beginners to intermediate in little time.

no?

Originally Posted by Dennis Erskine

Perf-Sorber is a combination absorber/diffuser in a single fiberglass panel. An excellent early reflection point product speakers with good off axis response. Also, a good choice around surround speakers. The other (I forget their trade name) is a product with very good absorption down to 150Hz.

Originally Posted by pepar

Nice thoughts, but it would still be a lot of work on a complex subject with many aspects that lack 100% consensus . . with no immediate . . and perhaps simply no . . return.

You're in marketing, aren't you?

Originally Posted by Triaxtremec

Where is a great place to get rigid fiberglass so I may make my own panels? Also are foam panels bad to use?

Originally Posted by Ethan Winer

In that case you'll do well to pack the entire space behind the drywall with fluffy fiberglass. Leaving off the bottom sheet rock will help a lot acoustically, because that gives substantial bass trapping along all the wall-floor corners. I agree with pepar about resale value, though maybe the next owner will want a good sounding room too?

--Ethan

Originally Posted by AnthemAVM

Anyone have a good place to buy Guilford of Maine fabric?

I have some GIK panels that need to be recovered in a new color.

thanks

Originally Posted by AnthemAVM

Anyone have a good place to buy Guilford of Maine fabric?

I have some GIK panels that need to be recovered in a new color.

thanks

Originally Posted by nathan_h

GIK sells GOM fabric separately from the panels for about $15 per yard which seems to be the standard price.