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@Glenn: Perhaps you've heard of the new 3D animated CGI summer blockbuster extravaganza acoustical romance coming out? Foamio and Juliet? (Sorry: OT. :) )

FYI: Packing foam is often highly flammable. Use at your own risk. (By contrast, acoustical foam is typically flame-retardent. And mineral fiber materials are inherently flame-retardent.) Secondary concerns: Packing foam is often less acoustically absorbent than purpose-made acoustical foam...

Glenn, Of the ones I've dealt with, absorption (and lots of it) was prescribed. The best description of the results, in general, is "band-aided." There was one church with a domed ceiling that had a ~125 Hz resonance that simply would not die. Decay was up around 8-10 seconds. It was...

Having a lot of experience trying to "fix" the acoustics in domed spaces, I second Mark's statement: It's a bad idea. Unless you are talking about a "money is no object" kind of budget (in which case, the IMAX idea might work), I would say it's highly probable that you will never be satisfied...

There's no way to tell if they're useful without knowing a lot more about the measurement that is represented in the graph. What type of signal? What type of microphone? What kind of loudspeaker(s)? What kind of room (if it was in a room)? How were all the components set up? Was this a lab...

The context of your post—college apartment, parties, loud music—leads me to conclude that your intention is not necessarily an über-high-quality dedicated listening / HT room; you just want things to sound good. Based on that, I would offer the some basic rules of thumb: L-C-R Symmetry: Set...

It's labeled "Cumulative Spectral Decay Plot." This type of graph is also known as a "waterfall" plot. Basically, a fancy (3D) way of looking at sound decay. Frequency is increasing from left to right (looks like 0-4000 Hz?), time is increasing from back to front (looks like 0 to 40 ms), and...

Foam that's 8-inch thick will control low frequency problems. How much relative to fiberglass (FG) of the same thickness is the real issue. Foam of similar density to "703" or "705" FG would provide roughly the same performance at low frequencies, assuming equal thickness. But foam usually isn't...

Mass-loaded vinyl, or MLV (Dynamat), around the blower casing will not help if the sound is primarily coming through the vent. Also, with only 2 feet between the blower and the vent, there's not much to work with. Even something like Chris is suggesting might have limitations being located so...

The chain you described is more or less correct. I think the short answer to your question is "it's in the software." There are many recording software platforms commercially available. If this is something you intend to start doing regularly, as a hobby, I can suggest investing in a decent...

Recording technique, particular for 5.1, is undoubtedly a more complex topic than can be covered in a forum such as this one, as was mentioned earlier. However, recording a thunderstorm monaurally - one microphone and some cheap / free software - is very easy. My question would be why the...

Auralex foam will not break down unless it is exposed to direct sunlight for prolonged periods.

I'm pretty sure the iPhone headset mic thingie can be used with the latest generation iTouch. There are also two other apps that I know of - probably for more than $0.99: Faber Acoustical's "SoundMeter" Studio Six Digital's "SPL"

normc, Perhaps a flawed approach isn't quite it. The math for the averaging you described simply doesn't work; 70 dB and 50 dB do not average 60dB - neither aurally, nor mathematically. But, again, it's nitpicky. You achieved a sound quality that works. Why nitpick it? :) As for the tones...

Overall, there are various technical flaws in this process. However: This is the important part. We could go back and forth, hashing out explanations for why the averaging described doesn't make technical sense (though I understand why you're approaching it that way), or the use of tones...

This topic has come up before: http://forums.audioholics.com/forums/showthread.php?t=50359 http://forums.audioholics.com/forums/showthread.php?t=39582 IMO, pointing the mic at the ceiling (or in any other specific direction) is hogwash. My advice would be to position the sound level so...

Level setting should be accomplished with broadband noise signals and listening tests. Tones should be used only to identify any anomalies in the room/system response.

Michel, Toole makes a clear distinction between trained and untrained listeners. Toole has noted the differences, as other researchers, such as yourself, have. Ando has even quantified those differences, at least in the case of musicians versus ordinary listeners. To me, the box on pp. 119...

Reread the article again and thought that there was one point left worth commenting on / clarifying: Quite a few researchers have proven that this is not necessarily the case. Lateral reflections are not necessarily detrimental to sound quality. Toole demonstrates this repeatedly (and...