Originally Posted by markus767
Yes, measure with an acoustic timing reference:
1. Set timing reference to L
2. Measure LFE
3. Measure R
4. Increase speaker distance of L and R by the same amount
5. Measure LFE
6. Measure R
If the measurements show always the same delay between sub and R then you're out of luck and you need to buy a new AVR with proper bass management.
Finally got around to report back: The first picture shows the measurements as described by you in 1 - 3. Timing reference is Front Left FL, and measurements are FL, FR, and LFE. The SW delay is about 2.5 ms (using the start of first peak in the SW impulse).
Then distance for L and R were increased by 1meter in the AVR. Results are the same.
So in this way, I cannot correct the delay between L, R, C and SW.
Coming back to my post 21520. With my standard setup, the proper speaker distance is:
FrontLeft 2.6m, FrontRight 2.6m, FrontCenter 2.6m, SurroundLeft 1.7m, SurroundRight 2.3m.
If I increase the SurroundRight distance setting to higher than 2.6, then the impulse response shows a reduced delay between L, R, C and SW. This shows that the AVR sets a delay for a speaker depending on the difference between that speaker distance and the maximum speaker distance.
So I could have:
Use the original distance settings, and have a 2.5ms delay between L, R, C and SW,
Use the trick with increased surroundright distance, which eliminates the delay between L, R, C and SW. But then there is time mismatch between surroundright and the other channels (of approximately 3.5ms).
What is best? My profile is movies. My gut feeling says that it is more important to get the front stage right, with the proper synchronizing of L, R, C and SW, at the expense of the surround channel.
This would be a short term solution. Longer term, I hope miniDSP would bring an HDMI AVRHD with Dirac and Bass Management before Dirac.