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In Reply to: Re: How do you measure room acoustics? GM ? posted by GM on January 03, 2000 at 18:08:22:
GM,Yes, my first objective is just to measure the room and understand what I have to start with.
My first attempt with the RS meter in-room at my listening position and with the Stereophile disk 2 frequency sweep warble tones produced a frequency response curve for my front left and right that was + or - 3 db from 30Hz to 4Khz, then I have a frequency bump of +3db up to + 6db at 4kHz and 8kHz before going back to normal at 9kHz.
I also have what appear to be 2 room modes, a -5db null at 50Hz and a -6db null at 200Hz.
The reason I am comtemplating a PC software RTA, impulse and energy measuring system is not for absolute accuracy, but for the following reasons:
1) a graphical record of each change vs effect that I make
2) a close to real time display of changes/effects as I make them
3) a cost effective solution (only software, I will use RS meter mic)
4) MY TIME! Changes can be accomplished rather quickly vs. just a RS meter and a frequency sweep and my pencil and paper.Currently trying to find anyone who has used the ETF5 software program, but nobody has responded in the affirmative yet.
What do you think?
Bruce
I think you're on the right track. I have done a bit of research since we started this thread, and have read/heard relatively consistently good reports about the ETF software.
One comment about your post though--we use the term "room mode" to delineate where the peaks are, not the nulls. So here you'd say you have "suckout" (or other audiophile-approved subjective term) at 50 and 200. It would make sense that you'd see/hear something at both 50 and 200 since they are even-order harmonics. Look into your crossover frequencies as a possible contributing factor here.
If you further investigate the ETF software package, please do keep me posted. This has piqued my interest and I'm anxious to hear more input into this matter.
Hope this was helpful!
Good luck!
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