Recent content by Bama214

:):):)

Success Achieved! Moved Mic position a few inches until L+R measurement showed no timing offset in the impulse graph Checked that individual Left and Right measurements aligned well with measured L+R -- success! Developed EQ filters based on L+R measurement Reran Left, Right and L+R...

Will pause to rerun using modified mic position to attempt to eliminate the time offset

looks like a fail

Attempting to send the file

Excellent! Did the time alignment of the individual L and R Verified impulse now aligns Did the A+B with the aligned L and R The resultant A+B matches closely the contour of the aligned L and R (with an approximate 5dB level change). Not sure where I go from here. Given there is a time...

I can try later - away from the house now. I have used the vertical orientation when I adjusted the theater system, but understood horizontal was preferred for 2 channel. I might also try the RTA with white (or pink?) noise to see what that might show. Thanks again for taking so much time...

The measured L+R is essentially identical to the A+B The mic position can certainly be adjusted. The 250usec difference is only 3 or 4 inches. A photo of the room is attached. Microphone was centered (as best I could by eye). Not sure how to proceed. I’ll try to be more precise with the mic...

Photos attached

Too bad - looked like the mdat was accepted. Using the combined L+R measurement shows a 100% peak at zero and an 85% peak at 250 usec, and 25% peaks at 635usec and 880 usec (looks like the same 250 usec offset). The overlay screen shows the same

Success - mdat attached

Yes acoustic reference. Yes the A+B sum of the right and left channel matches the measurement of L+R No the individual L and individual R measurements (which are quite similar) don’t match the L+R measurement Thanks for all the help. I’ll try to append the mdat soon

Ok - found trace arithmetic. Computed L+R as you suggested. Result does match my combined measurement. So should my procedure have been to first measure the combined L+R frequency and use that to generate the EQ filters? Thanks again!

Thanks for the response. Can you please define “trace arithmetic to calculate A+B“. I have the sweeps.

An REW noob here, but read the help files and watched enough tutorial videos to be dangerous. I’ve successfully measured (individually) my left and right speakers, computed calibration filters, and loaded those filters into my RME-ADI-2 DAC. Then remeasured each speaker individually. Great...