Controlling Room Effects in my new HT - AVS | Home Theater Discussions And Reviews
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post #1 of 11 Old 09-11-2007, 09:49 AM - Thread Starter
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The specifics of my room can be found here.
http://www.avsforum.com/avs-vb/showthread.php?t=866660

I ordered a Onkyo 905 and a 13-Ultra. I also ordered the Avia CD & SPL meter. I'm wondering how these work together with Audessy. Also, what exactly PEQ is? Does this come with the Ultra? Should I still buy a BFD? I'm also looking at buying some tri traps from GIK and was wondering if I really still need them on the back wall since the sub is going to be placed in the corner behind the sofa? or do should I just put a couple Tri traps (8') across the front floor?

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post #2 of 11 Old 09-11-2007, 10:21 AM
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It looks like you've gotten off to a good start! You've got absorbing panels for early reflections as well as bass traps, which will really clean up your sound. For absorbing early reflections, one method for placing them is by sitting in your listening position while a helper moves a mirror along each side wall. Where you can see the reflection of the speaker in the mirror is where to put the panel. You should place absorbing panels on each wall to absorb early reflections from all three front speakers. Absorption needs to be placed on the ceiling as well as the floor, unless the floor is carpeted. For bass traps, here's a good primer on placement: http://realtraps.com/lf-noise.htm Bass traps need to go wherever bass is a problem, usually in the corners but can crop up in other places as well, depending on the room.

PEQ stands for Parametric Equalization. You need it to reduce peaks in your rooms response. PEQ allow you to set the center frequency and width of the frequency band being corrected. You can find what frequencies your peaks occur with an SPL meter and test tone CD. It's important to remember that PEQ will only reduce peaks at the listnening position. It's not a good idea to use PEQ to boost nulls. The best way to even out bass response (boosting nulls and reducing peaks) throughout a room is by proper placement and phase of the sub (requires experimentation) as well as bass traps. Then use PEQ to flatten whatever peaks remain.
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post #3 of 11 Old 09-11-2007, 03:51 PM - Thread Starter
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Is Room EQ Wizard and a Radio Shack SPL meter one of the easier ways to generate a frequence response chart?

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post #4 of 11 Old 09-11-2007, 04:34 PM
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The RealTraps website mentioned above has a free test tone download from 10hz to 300hz in 1hz increments that you can graph out manually. Room EQ Wizzard is nice but you will have to be handy with computers.

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post #5 of 11 Old 09-11-2007, 04:51 PM
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Yes, for hobbyists like ourselves, Room EQ Wizard and a Radio Shack SPL meter is one of the best and easiest and cheapest ways to generate a variety of frequency and response data.

Tim

p.s., GIK products cured my room.

He drove a black and white pirate ship at 190 mph.
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post #6 of 11 Old 09-11-2007, 06:40 PM - Thread Starter
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Quote:
Originally Posted by OvalNut View Post

Yes, for hobbyists like ourselves, Room EQ Wizard and a Radio Shack SPL meter is one of the best and easiest and cheapest ways to generate a variety of frequency and response data.

Tim

p.s., GIK products cured my room.

Ahh, you live in ATL too. I'm over in Suwanee. I'd be interested in what you did with your room. Anything online?

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post #7 of 11 Old 09-11-2007, 06:50 PM
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Yep, see the following link for the whole saga...

http://www.***************.com/fusio...hp?tid/134369/


Tim

He drove a black and white pirate ship at 190 mph.
- Dale in the #3 will never be forgotten. Thanks for the memories.
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post #8 of 11 Old 09-12-2007, 06:05 AM - Thread Starter
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Interesting stuff. I can't wait to get my SPL meter and try running some tests. I have a feeling I'm in for some pretty bad effects. Everyone has me nervous about my nearly square room. How long does it take to generate a response curve once you have it set up? I'm wondering if you can hold some treatments in place to experiment with its effects.



Quote:
Originally Posted by OvalNut View Post

Yep, see the following link for the whole saga...

http://www.***************.com/fusio...hp?tid/134369/


Tim


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post #9 of 11 Old 09-12-2007, 06:12 AM
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The velodyne sms-1 is a great addition to the bass acoustic adjustments. It made a BIG difference in the total sound in the room IMO.
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post #10 of 11 Old 09-12-2007, 06:22 AM - Thread Starter
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I've gathered that the feedback destroyer is a little harder to configure, but does a nice job as well too (and a lot cheaper). Since you typically only EQ once, I imagine I'll go with the cheaper method. I figure I'll measure what I have so far first and then add some treatments and then add the BFD or SMS1 (in that order) as required.

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post #11 of 11 Old 09-12-2007, 06:34 AM
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Quote:
I figure I'll figure out what I've got first and then add some treatments and then add the BFD or SMS1 (in that order) as required.

Yep, treat the room first, then EQ second.

In REW, the measurement sweep takes just a few seconds, then the frequency response chart shows up right away. At that point then you can use that data set to generate additonal graphs by selecting each as needed. Any graph/chart you select is then generated within seconds of when it is selected.


Tim

He drove a black and white pirate ship at 190 mph.
- Dale in the #3 will never be forgotten. Thanks for the memories.
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