I've been nursing a cold and getting ready for an upcoming HIFi show, THE Show Newport, description here: www.cahoyt.com/trinnov
. If anyone is going to be in town for it, it would be a pleasure to meet- so please stop by and say hello!
Regarding Steve's configuration, the comments posted by Curtis and others are good feedback. Here are a few key points:
-any time you combine components, like the 972 with the MC-12, the sum will not necessarily be as good as the parts, particularly with respect to audio transparency. Regardless of the presumed compromise in the xovers, etc, it is worth a listen to the 972 alone, to provide a baseline. This is particularly true if you add complications such as bass management after the 972. Unless finessed well, it can possibly go wrong. Know your variables and you'll understand your results.
-Trinnov reporting- as Curtis pointed out, this is mostly covered in the User Notes. Values for level are relative. The main point is to get all the speakers to report as close as possible to one another. Usually this means only adjusting the sub, because it's your only variable. If you have outboard amps with level adjust, get them loud enough so you get 75-80dB SPL on the radio shack meter.
-xover and sub reports are based on speaker and room interaction. All audio below 20hz, is left uncorrected.
The system is designed not to damage typical subwoofers. Below 25hz, there are a number of factors that can throw off measurements or cause issues- infrasonic noise, mic self noise, etc. As well, correcting with power on ported subwoofers below their port frequencies can damage drivers. In the pro units, we leave it to your discretion.
Bass management- Trinnov attempts to smooth the xover region. Remember Jeff's advise: switch the polarity on the sub after calibration- to see if bass improves.
-EQ and 2/d-3/d remapping are independent functions. Nothing in the EQ will affect remapping results, such as muting speakers. Some of the reported muting, like Steve's center channel going away- what to do: (1) go back and examine the results (always available in the calibration menu > RES1-2-3, found below CAL1-2-3). Verify the speakers are found and gives predictable results in height and angle, (2) play tracks with hard center (i.e. solo movie dialog), (3) try each of the functions NONE, D+L, 2D, 3D. Summing it up: what does/doesn't make sense about it. If the center is the issue, where is it reported relative the the L/R? Height? Angle? If any speaker becomes fully
muted, and shouldn't be, this may point to a hard error, as reported in some previous cases where the micro-controller shut down channel(s). For Steve's 5.1 with everything looking good- I'd be looking to re-flash.
External Signal Testing- The only way to effectively send an analog test signal through a corrected 972 is to have EQ correction ON and 2d/3d OFF
. Measuring EQ with remapping on will result in unpredictable results, because the test signal has been converted into a spatial object.
Regarding measurements, with the 972 you can only measure externally via stereo pairs. Therefore if you want to improve results in all speakers, you have to calibrate pairs, evaluate, make adjustments, then calibrate the next pair, and so on. Then when complete, cal the whole system.