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In room response

Hello, Lately I have noticed more talk of in room freq response measurements. It has been mentioned in regards to room treatment, subwoofers and their intergration, speaker placement, room size, crossover points, listening volume levels, speaker choices in regards to the type of music you listen to and a myriad of other reasons. I for one fell it is quite important and others seem to disagree to its importance in playback of recorded music.

This thread would be a great place for members to discuss its importance, ramifications, reason for being and to discuss results.

I have seen a few members who allready have posted results of the measurements under their "systems page". I just recently posted my freq response and waterfall graph on my "system" link.

I am quite sure that there are members who have allready done in room measurements of freq response, waterfall and RT60 or other measurements. If you are new to this, a program can be downloaded for FREE at the Home Theatre Shack, it is called the Room EQ Wizard. See link below. It would be used for mesurment only for our purposes, although it can be used with equalizers such as Behringer if you so desire.

http://www.hometheatershack.com/roomeq/

The only thing you need to provide is a sound level meter, which everyone should own, even if you don't use this program. A very inexpensive one is available from Radio Shack and is a welcome addition to any audiophiles toolbox.

I will start off with my freq response from 15-200 hz at 74db reference level posted here;
http://cgim.audiogon.com/i/vs/i/f/1208699468.jpg

Waterfall response 20-116hz posted here;
http://cgim.audiogon.com/i/vs/i/f/1208644826.jpg

Waterfall response 116-210hz posted here;
http://cgim.audiogon.com/i/vs/i/f/1208645085.jpg

Anyone else?

Bob
acoustat6
strabo
15 posts
 
As to follow up my previous post, is there a target RT30 or RT60 time?

What made me ask is we have a small auditorium at work that seems like it was built using the classic LEDE approach and it is D E A D. IMO, it is overkill and boarderline difficult to listen in. I know I don't want my listening room to sound this dead. Is there an optimum measurement to shoot for?
acoustat6 OP
357 posts
 
Hi Strabo, I see the pictures of your before and after in room response. I believe there is a substantial change for the better. You mention room treatment and speaker positioning as the two changes you made to get a better graph. Did you hear a change for the better? And do you think you could have made these changes (for the better) without using the REW?

Bob
holenneck
127 posts
 
http://cgim.audiogon.com/i/vs/i/f/1209053544.jpg

here is my in-room response
holenneck
127 posts
 
http://cgim.audiogon.com/i/vs/i/f/1209053544.jpg

the above response is taken with a USB microphone that is not accurate above 10k.

another big issue with good system setup is properly integrating a sub. Proper Phase adjustment is cruical.
acoustat6 OP
357 posts
 
Hi Holeneck, Thanks for posting! I have a few questions. You are using TruRTA which is obviously differnt from the REW software. My question is that your reference level seems quite low, if you look at the 1000hz freq it is at at approx 52db, which is very low. Is it possible to redo the level so you are measuring at a higher level such as the recommended 75 db as recommended by the REW? Otherwise it looks very good.
Thanks,
Bob
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