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#420969 - 11/05/16 02:24 AM Room Treatments
2x6spds Offline
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Registered: 03/16/02
Posts: 3186
Loc: CA, USA
I have a wickedly unpleasant 800Hz spike in my living room. Major bass suckout as well. It's a peculiarly shaped room with ceiling which ranges from 12 to 20' and then a stairway which goes up to a landing which is 30' above the living room floor. Worse, there is a skylight which is a 3.5' x 3.5 'chimney' up to the slanted skylight. Acoustically, a nightmare.

So, I built one (building another) 7' x 4' framed treatment with 2" of rockwool behind a patterned fabric. I will try to post pictures.
[img]https://postimg.org/image/59j3dwyt7/[/img] [img]https://postimg.org/image/ijg47bz65/[/img]

I'm hoping this will tame the 800Hz. Ian suggested multiple subs for the bass problem. I have 1 EP600. Might be cheaper to get a new house.
[img:center]https://postimg.org/image/ijg47bz65/[/img]


Edited by 2x6spds (11/05/16 02:25 AM)
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#420978 - 11/05/16 03:58 PM Re: Room Treatments [Re: 2x6spds]
bridgman Offline
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Registered: 08/25/04
Posts: 6208
Loc: Bowmanville, Ontario, Canada
Nice... like camo for a fine living room.

I was thinking that a Helmholz resonator tuned for 800 Hz and filled with absorbent material would be useful, but I had trouble finding dimensions that would cooperate.
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#420980 - 11/05/16 04:52 PM Re: Room Treatments [Re: 2x6spds]
2x6spds Offline
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Registered: 03/16/02
Posts: 3186
Loc: CA, USA

Wise guy!

Of course, this's guy http://preserve.lehigh.edu/cgi/viewcontent.cgi?article=2015&context=etd master thesis agrees with your concept.
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#420987 - 11/06/16 07:41 PM Re: Room Treatments [Re: 2x6spds]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 6208
Loc: Bowmanville, Ontario, Canada
Yeah, I found that but it used long words and I was really tired.
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#420989 - 11/07/16 07:49 PM Re: Room Treatments [Re: bridgman]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 3186
Loc: CA, USA
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#420993 - 11/07/16 09:06 PM Re: Room Treatments [Re: 2x6spds]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 3186
Loc: CA, USA
Helped bass suck out ... 800Hz spikey better ... needs more help
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#421004 - 11/08/16 05:37 AM Re: Room Treatments [Re: 2x6spds]
AAAA Offline
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Registered: 03/28/14
Posts: 1593
If I had a better idea of your room I could help with the bass issue. The 800hz issue sounds like a mechanical resonance, not an acoustical one. If I had to guess the tweeter is under damped suffering distortion. Is this your EPOS setup?

The panels you put up will lower decay time and reduce parallel flutter issues. They cant fix a bass null issue or mechanical resonance. frown You have to move the speaker or listener for Bass problems.

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#421006 - 11/08/16 05:53 AM Re: Room Treatments [Re: 2x6spds]
AAAA Offline
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Registered: 03/28/14
Posts: 1593
Tighten up the drive units.

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#421008 - 11/08/16 11:51 AM Re: Room Treatments [Re: 2x6spds]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 5941
It's his tube amps. The natural frequency of a grid on a pentode is 800Hz.
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#421009 - 11/08/16 03:34 PM Re: Room Treatments [Re: 2x6spds]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 3186
Loc: CA, USA
Thank you fellas
I am using a pair of Emerald Physics EP100.2SE power amplifiers, a pair of Emerald Physics EP2.8 speakers with DSP.

Thanks for the suggestion about the tweeter and drivers!

The designer of these speakers is coming out this Thursday with an upgraded DSP and other goodies.

I'll report back


Edited by 2x6spds (11/08/16 03:34 PM)
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