Originally Posted by penngray
What Mics do you have and what are you trying to do? There is a great thread in the DIY section showing many mics do not really need special calibration when it comes to measuring bass response in room...
Hi, thnx for the response. I have several decent condenser mics, including two Behringer ECM8000 mics (one supplied with each of my Velodyne DD10 subs, no cal file provided or available from Velodyne). I'm not sure if a generic cal file is available for free download anywhere (or if that would be of much use) but I believe it costs around $100 to have one calibrated, not much different than ordering a new one with cal file. I also have an Audyssey Pro calibration kit mic, which has a cal file provided but it is proprietary and not usable outside the Pro software). I also have a Groove Tubes GT55 (Studio FET recording mic with no cal file). I have gone ahead and done what I could with the tools at hand...
My first task was to optimize placement of my dual subs taking into account their simultaneous output interacting with room nodes. Each sub has an internal SMS system designed to measure that sub's response in room. I figured out a way to do a sub crawl using one sub's test tone to test both subs at the same time. I ran the tone to the AVR, as usual, and then simply split the sub channel output signal to both
subs. A real-time response graph is shown on the TV display as one manhandles the subs around. I ended up placing the subs midpoint on front and back walls.
As a baseline, I then ran Audyssey Autosetup calibration on my Denon A100 which has MultEQXT32 using the Denon supplied standard cheapy Audyssey mic (+/-2dB, internal cal filein the AVR). XT32 first pings the subs individually for distance and level, then EQs them together. End result sounded pretty good. To take full advantage of Audyssey, I then used the Audyssey Pro Cal system with its more accurate mic and more powerful software to redo the calibration. Once finished, It shows what I take to be fairly accurate "before" graphs. I cannot vouch for the accuracy of the "after" graphs but I must say it sounds really good. I posted on this here
From this point, when I can free up some time, I'd like to do more measuring. Perhaps I'll experiment with some room treatments, but these have very low WAF.
BTW, I briefly tried OmniMic, which I posted about here
, but I'd been very busy with work and didn't have time to play with it to be sure it was worth it. Before the 45d return period expired I returned it. It's kinda sad when even such a simple system seems to have a pretty steep learning curve. I'm gettin old...