Sub time alignment - REW and MSO disagree

[klettermann]

Just that. Moreover, I've been playing more with MSO, experimenting with different combinations of filters, all-pass on one sub or the other vs no all-pass, etc. Using different EQing schemes in MSO gives different delays. And they don't deliver the same delays as REW using the alignment tool. The REW result does come closer to the delay calculation by measured distance, FWIW. Does this make any sense at all? It seems like something is fishy, or perhaps I'm doing something wrong. I'm assuming that the delay filter should be on the sub closest to the MLP. Any ideas? Thanks and cheers,

 

[dualazmak]

Sorry for my belated response.

Just for your reference,,,
As for time alignment among multiple SP-drivers in DSP based multichannel multi-SP-driver multi-amplifier active audio system...

In my case, I evaluated, validated (important!), measured, and applied;

1. Primitive but reliable reproducible "Time-shifted multiple-Fq-tone-bust method";
- Precision measurement and adjustment of time alignment for speaker (SP) units: Part-1_ Precision pulse wave matching method: #493

2. "Multiple-Fq-simultaneous-tone-burst energy-peak matching method";
- Precision measurement and adjustment of time alignment for speaker (SP) units: Part-2_ Energy peak matching method: #494

3. "Single sine-wave matching method";
- Precision measurement and adjustment of time alignment for speaker (SP) units: Part-3_ Precision single sine wave matching method in 0.1 msec accuracy: #504, #507

In case if you would be seriously interested in applying these methods in your setup, I would be more than happy sharing the test-tone signals I prepared and applied; please simply PM contact me writing your wish.

 

[3ll3d00d]

Does this make any sense at all? It seems like something is fishy, or perhaps I'm doing something wrong. I'm assuming that the delay filter should be on the sub closest to the MLP. Any ideas?

totally normal, MSO isn't trying to align them, it is aiming to produce the best summed response given the measurements provided