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#142457 - 06/28/06 06:43 PM Re: Acoustic Panels [Re: dllewel]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5256
Loc: Bowmanville, Ontario, Canada
>>I'm with you Mark. To me, the graph still has the same dips and peaks, everything has just been dampened.

I think that is what you would expect from good room treatments. You can't fundamentally change the peaks and dips except by (a) changing the dimensions of the room, (b) changing the speaker placement relative to the walls, or (c) sitting in a different place in the room relative to speakers and walls.

What bass traps can do is make the peaks smaller so you get a flatter frequency response -- when I look at that graph I see most of the peaks reduced by ~8 dB (which is a fair amount) and some reduced by 10-12 dB. I bet that room would sound MUCH better with the bass peaks taken down 8-12 dB.

Also, a frequency response graph only shows the most blatant changes. You need something with a time element, like a spectral decay graph, to show the reduction in echo at different frequencies, aka improved "tightness".

Having said that, the only "treatments" I have had time for in my new house are a borrowed rug and a pile of moving blankets in each corner (hey, I had to put them somewhere ).

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#142458 - 06/28/06 07:03 PM Re: Acoustic Panels [Re: bridgman]
dllewel Offline
connoisseur

Registered: 06/20/05
Posts: 1189
Loc: Utah, USA
Thanks Bridgman!
_________________________
-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/

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#142459 - 06/28/06 08:09 PM Re: Acoustic Panels [Re: dllewel]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Interesting information overall....thanks for the input everybody.

>>>> I have also been researching some treatments for my room. Don't know what just yet (DIY or professional), I am trying to decide what is "needed" without absorbtion overkill.

This was my original thought process as well Dave, start here and then go from there.
_________________________
Rick
Our Room

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#142460 - 06/28/06 08:50 PM Re: Acoustic Panels [Re: dllewel]
royce73 Offline
veteran

Registered: 04/20/05
Posts: 170
Loc: New Jersey
Quote:

I have decided not to do any panels in the back of the room (between the side and back surrounds). Here you don't want absorbtion of the mid and high frequencies, but rather diffusion for a more spacious surround effect.





You are absolutley right in this assesment. From a lot of articles that I have read, most recommend putting a wooden CD?DVD rack against the back wall as it makes for an excellent diffusor.

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#142461 - 06/29/06 12:51 AM Re: Acoustic Panels [Re: royce73]
MarkSJohnson Online   happy
shareholder in the making

Registered: 09/27/04
Posts: 10682
Loc: Central NH
I make my fat-ass dog sit in the corner of the room when I'm doing critical listening.
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#142462 - 06/29/06 09:51 AM Re: Acoustic Panels [Re: MarkSJohnson]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16225
Loc: Leesburg, Virginia

_________________________
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#142463 - 07/03/06 09:56 AM Re: Acoustic Panels [Re: royce73]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
Has anybody used products from HSF Acoustics? Prices seem to be very reasonable and there before/after sound clips show amazing difference when applied. I see they also have an Ebay store.

http://hsfacoustics.com/studiopacks.htm
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#142464 - 07/04/06 06:58 AM Re: Acoustic Panels [Re: SirQuack]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
The only problem I can see with the HSF stuff Randy is trying to get the things to blend with the room and decor, which I understand can be a problem in most home environments. Some folks like the bold 'engineered' look of these types of panels, which look great in some environments, personally I'm looking for something a little (lot) laid back.

On another note...

Last night while listening to music in 2 ch stereo I noticed the left front main seemed to have a little less volume than that of the right front main, maybe even a little (very minute) flatter sound and was thinking how I may need to recalibrate. Just in a matter of minutes my wife walked in and closed the plantation shutters that are on the window within the first reflection point of the left front speaker and I couldn't believe how the speaker came back to life ... I'm assuming the shutters, while open act as a diffuser on that particular speaker while the right main is getting full reflection from a solid wall.

Does absorbing panels, traps and diffusers tend to flatten the sound as these shutters seem to be doing? Also, sometimes I wonder if a little reverberation and reflection isn't necessarily a bad thing, especially in a pretty decent acoustic room ... which I believe *luckily* ours seems to be.
_________________________
Rick
Our Room

smile

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#142465 - 07/04/06 02:16 PM Re: Acoustic Panels [Re: RickF]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
Good questions Rick, for me I don't think the HSF stuff would look that bad. My back screen wall is painted flat black and my side walls ceiling are painted a dark navy blue. Since this room is a dedicated HT room, like a theater, it might work for me.

The sample audio clips are amazing what they did for the guitar and drum. I'm going to try the real traps test tones one more time with the 500 in the corner and compare to the other locations. Who knows, maybe I'll make some DIY treatments to see what happens, might be hard to beat HSF prices though.

I'm sure the 4' x 8' pool table I've added will change things also.
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#142466 - 07/04/06 02:54 PM Re: Acoustic Panels [Re: RickF]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5256
Loc: Bowmanville, Ontario, Canada
>>Does absorbing panels, traps and diffusers tend to flatten the sound as these shutters seem to be doing?

Sort of, but in your case I think the issue is that you need to recalibrate by a few dB when opening and closing the shutters, or at least calibrate with them set to whatever you use when listening. I noticed that between my left and right surrounds (M2s right now; my QS8s are out for extended audition) I had to bump one side up by 4 or 5 dB because it was in the open while the other was a couple of feet from a wall.

Randy, the good news is that you have a new degree of freedom -- you can experiment with changing your room acoustics by moving the pool table around

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