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In Reply to: Re: unrelated posted by hemholtz on March 24, 2007 at 19:28:35:
Is that the impulse measurement of a multi-driver speaker? If so, it looks pretty good to me.I had forgotten that this is the Planar Asylum and most of the speakers here radiate as line sources, not point sources. I'd still want to window out all first reflections off of walls when I make my frequency response measurements.
There are tradeoffs associated with room acoustics. Fast decay gives better clarity and imaging, while slow decay of gives a richer and more lively presentation. I do not subscribe to the theory that the recording engineers mixed in anticipation of listening under semi-anechoic conditions. Note that typical microphone placement is very close to the performers, so the direct-to-reveberant energy ratio captured by the microphones is much higher than a normally-seated listener would experience.
Follow Ups:
those are mg3.5r's. that's a measurement from my old room. i'll post some new ones in my gallery when the boys down under at deqx get done upgrading my crossover.so you set you room up to correct for bad mic placement? interestng idea, but potentially at the risk of detail and imaging.
i really don't think the engineer anticipates a room at all. normally they use headphones. the best situation is to get the sound from the speakers to you ear without letting the room change it. it's not as easy as it sounds.
So you use DEQX? That would explain the remarkable impulse response.Well you and I both like planar speakers with well-controlled directivity, and we both like to diffuse the reverberant sound. Apparently we have our philosophical differences about why we do what we do, but what we do is very similar.
If we were far apart in practial application I might quibble with you about the intentions of recording engineers, but I think we're on the same page about enough of this that I'll pass on the quibble.
The Auralex t'fusor looks very interesting. Thanks for bringing it up. A nice oiled hardwood quadratic diffusor would have higher WAF, but at many times the price. I might have to give the Auralex a try.
Do the Auralex t'fusor panels come nested? I'd like something diffusive that can be taken down into a relatively compact package for easy transportation to and from audio shows.
Thanks,
i think you get 6 nested in a box. they fit tight together so you could certainly fit more. i spray painted mine with the speckled paint to make them look like granite. might help with waf. auralex recommends a whole can of spray paint per panel. i thought that sounded crazy, but that's about what it takes. quite a bit of surface area there. i think i cleaned out home depot, lowes, and menards of the one color i was using. i have 16 of them so just the paint was kind of pricey.
i attached them with carpet tape along the outside edges and plastic anchors in the corners. if you spray the anchors after installation they blend right in.
The speckled paint idea is ingenious. Thank you very much for the information and tips.
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