help with further construction off cinema / music room sloped front and rear wall - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 78 Old 04-22-13, 08:52 AM
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Re: help with further construction off cinema / music room sloped front and rear wall

That's possible that you are introducing a null to compensate for the resonating wall.

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post #22 of 78 Old 04-22-13, 10:00 AM Thread Starter
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Re: help with further construction off cinema / music room sloped front and rear wall

Bryan,

When i place the mic closer to the front speakers aprox 4.2 foot, the 120 hz problem is gone.
What is your conclusion to this?

Thanks,
Mike
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post #23 of 78 Old 04-22-13, 10:06 AM
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Re: help with further construction off cinema / music room sloped front and rear wall

It could be either a modal problem or a boundary interaction from reflections on the side walls. Try going back to where you were and measuring a foot off to one side and see what happens.

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post #24 of 78 Old 04-26-13, 04:25 PM Thread Starter
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Re: help with further construction off cinema / music room sloped front and rear wall

Bryan,

I have made the frontwall completly dead like you suggested.
There is much more imaging and i can hear things that i could not hear before because of frontwall reflections. It seems treathing the upper wall, from where the sloping begins made a hugh improvement regarding reflections.

But, i find the room sounds too dead right now, its not pleasant listening to music, ht is fine..

As for the 120hz problem, i have not measured but moving my head one or two foot to the right or to the left does not seem to help. Moving head two foot to the front, and bingo everything is there...but that is on middle of room and not doable with movie watching.
Its not only 120hz related, overall performance is much better two foot the front.

What do you think, has it something to do with the one layer sloped back wall? Is it possible the low frequencies go trough this one layer drywall and are stuck in the 2meter cavity bhind?

Also the entire ceiling is one layer drywall with lots of cavity behind, i am thinking this is acting like a helmholz resonator...

I am willing to do anything to make this room sounds great!

THANKS A LOT!

Last edited by mikesp1; 04-26-13 at 04:58 PM.
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post #25 of 78 Old 04-27-13, 01:57 PM
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Re: help with further construction off cinema / music room sloped front and rear wall

Well, 2 channel and HT are different design goals. If moving forward fixes the problem and nothing else has, then moving is the answer. This is why one gets the seat right first, then picks a screen size.

Bryan

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post #26 of 78 Old 04-27-13, 02:48 PM Thread Starter
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Re: help with further construction off cinema / music room sloped front and rear wall

Hmm, well i am not moving much further.
Goal was 60% music, 40 % ht

I made some progress ( rew wise )but also moved backwards.

Still a lot of questions stay unanwserd.

MORE CONFUSED THAN BEFORE!

Last edited by mikesp1; 04-27-13 at 03:10 PM.
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post #27 of 78 Old 04-27-13, 08:43 PM
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Re: help with further construction off cinema / music room sloped front and rear wall

Personal opinion: a well-controlled room may sound a bit dead, but dead (acoustically) beats poorly controlled any day. And great imaging is the best goal you can reach for with 2-channel. Give yourself a chance to start discovering more detail in the music and I'll bet you never want to go back to a more live sound. Just a guess.
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post #28 of 78 Old 04-28-13, 11:04 AM
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Re: help with further construction off cinema / music room sloped front and rear wall

I would agree 100%. It is very different certainly than what you're used to. If you live with it a while and then were to undo it, you'd be surprised how quickly you'd go back.

You can use a thin facing like some 5-10 mil plastic high on the front wall to minimize the high frequency absorption from that portion but you still want the middle of the wall full range.

Bryan

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post #29 of 78 Old 04-28-13, 11:35 AM Thread Starter
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Re: help with further construction off cinema / music room sloped front and rear wall

You guys are probably right, i am alreay finding it a bit less dead.
New question: what about ceiling, its about 2.3 m high and i am planning on installing a star ceiling, do i have to absorp it also? Or leave it?
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post #30 of 78 Old 04-28-13, 11:52 AM
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Re: help with further construction off cinema / music room sloped front and rear wall

I wouldn't do the whole thing in absorption. Maybe just the reflection zone and leave the rest live.

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