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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

Showing 4 responses by strabo

strabo
15 posts
 
This could be a fun thread. Your rooms are much better than mine.

Here is my before graph. This was my initial FR measurement before doing any room treatments or changing speaker placement.
[URL=http://cgim.audiogon.com/i/vs/s/f/1208799876.jpg]Original[/URL]

After moving the speakers and fixing quite a few trouble spots.
[URL=http://cgim.audiogon.com/i/vs/s/f/1208799877.jpg
]Current[/URL]
I've actually made a few changes since this measurement and need to get a new graph and waterfall.
strabo
15 posts
 
04-23-08: Holenneck, not sure how to post my in-room response, but it is pretty snazzy, especially since i am incorporating Anthem's new room control.
I'm curious, since you have the tools to look into this, how does "room control" affect the waterfall graphs or RT60 decay?

Can you post before and after pic's of the RT60 with the room control?
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?
strabo
15 posts
 
Bob,
Yes, the changes definately cleaned up bass issues. Based on my original graph I had two note bass. Now it is much more even.

I wouldn't have even attempted this without the software. I did adjust my sub (used only for HT) manually once. It was a PIA and I never moved onto the mains. My first move with the software was to find an optimal speaker position within the reasonable options of my room.

The software quickly pinpointed problem frequencies. Next I used the tone generator to find the exact locations in my room of the problems and started treating those spots.

I have 7 major problem areas that I have attacked with fiberglass panels and one helmholtz resonator. There is an eighth problem area that is into the room a bit so I left it, but the rest were either in a corner, mid-wall, or quarter-wall. Some were at the floor, some were at the ceiling. None were floor to ceiling, and not all corners, mids, or quarters needed work.

I still have plans for more work on the seven areas. The forecast is for crappy weather for the next 4 days which may give me a chance at new measurements soon.
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