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In Reply to: Indoor response measurements. What should I expect to deal with? posted by Dan_ed on August 22, 2007 at 10:39:55:
I'm not real familiar with true rta, but usually with an RTA you play noise and it shows you the response. It will be influenced by the room depending on any windowing that is applied, but I would just assume it will be influenced by the room if you're measuring low frequencies. Btw, you can get a simple, free RTA program off the web. It's called jDFT, I think. You should be able to find it through google. I've used it to measure spectrums of various things where I couldn't run a dual channel setup - my lawn mower exhaust, a simple car stereo install, etc. Then you just need a cd with pink noise or something similar. I personally don't like RTA's much and use Speaker Workshop if I have a choice (or anything similar - dual channel measurement), but it is a bit more complicated to setup and run.
I'm usually in the same boat with horns - can't / don't want to move them outside. Besides, with the typical undersized midbass horn, the loading might change anyway depending on placement. I'll typically ignore room effects to some extent and just get an idea of the tonal balance in the room. Now if you have some funky case where the direct sound and the reverb are vastly different, this may not work for you, but it's never been too big a problem for me. It helps if you can smooth the response either in the program or mentally. Don't start trying to eq every little peak and dip.
I'd put the mic where you plan on putting your head for starters. Measurements in the horn will not necessarily translate to the response outside the horn, so I would not do that unless you are doing some other kind of measurement.
Another advantage of something like Speaker Workshop is that you could also measure impedance and then tweak your passive crossover design on the computer before building and experimenting, if that's what you're wanting to do. Just fyi.
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Follow Ups
- RE: Indoor response measurements. What should I expect to deal with? - John Sheerin 17:47:31 08/22/07 (0)
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