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Room Treatments
#420969 11/05/16 06:24 AM
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2x6spds Offline OP
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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]

Last edited by 2x6spds; 11/05/16 06:25 AM.

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Re: Room Treatments
2x6spds #420978 11/05/16 07:58 PM
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axiomite
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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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Re: Room Treatments
2x6spds #420980 11/05/16 08:52 PM
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2x6spds Offline OP
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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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Re: Room Treatments
2x6spds #420987 11/07/16 12:41 AM
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axiomite
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Yeah, I found that but it used long words and I was really tired.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
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Re: Room Treatments
bridgman #420989 11/08/16 12:49 AM
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Re: Room Treatments
2x6spds #420993 11/08/16 02:06 AM
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2x6spds Offline OP
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Helped bass suck out ... 800Hz spikey better ... needs more help


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Re: Room Treatments
2x6spds #421004 11/08/16 10:37 AM
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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.

Re: Room Treatments
2x6spds #421006 11/08/16 10:53 AM
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Tighten up the drive units.

Re: Room Treatments
2x6spds #421008 11/08/16 04:51 PM
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It's his tube amps. The natural frequency of a grid on a pentode is 800Hz.


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Re: Room Treatments
2x6spds #421009 11/08/16 08:34 PM
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2x6spds Offline OP
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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

Last edited by 2x6spds; 11/08/16 08:34 PM.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.
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