Post by ansat on Apr 26, 2015 14:18:04 GMT -5
EDIT :: Made a correction to the chart labels.
Nick -- I did some extensive testing this morning and here is what I found. All tests are measured from the XMC-1 XLR outputs. (no speakers, no microphone)
1. The crossover ignores the gain structure set by dirac for the sub and appears to apply the gain structure of the mains to the sub instead.
2. Filters from the mains and the sub are applied to audio sent to the sub from the crossover.
2a. You can stop this by setting the curtain of the speaker that is being crossed over to the crossover point. (this will only allow the subs filter to affect the response)
NOTE -- These graphs do not measure the same way that speaker measurements would. There is no room gain and no speakers involved. The higher gain of the LFE measurement would be normal since it requires more gain to get the subwoofer to play the same SPL as the mains. (My Subs are about 6db less efficient then the mains) Also, the crossovers would not match correctly due to this. However, I did find that the LFE is about 10db hot compared to when they play from the LFE then played from the xover. Not sure why this is like this and I don't have another branded receiver to test with.
Below is the graphs of the original filter. (no custom curtains applied)
Blue = INPUT - LFE OUTPUT - SUBWOOFER
Red = INPUT - FRONT OUTPUT - SUBWOOFER - 80hz X-Over
Purple = INPUT - FRONT OUTPUT - FRONT - FULL RANGE
Yellow = INPUT - FRONT OUTPUT - FRONT - 80hz X-Over
Purple = INPUT - LFE OUTPUT - SUBWOOFER
Green = INPUT - FRONT OUTPUT - SUBWOOFER - 80hz X-Over
Blue = INPUT - FRONT OUTPUT - FRONT - 80hz X-Over