Mains +sub impuls response

[Darek K]

Hi.

I made three measurments in REW with "Acustic timing reference" enabled : L (green). R (violet), Sub(yellow).
This is a screenshot of the Overlays/Impulse Response window.

Left channel is a bit further away from the MLP, and this is visible in the "Impulse Response" graphs.
This state is as I expect.
But it looks like sub is 15ms closer MLP.

Am I right ? Am I reading these charts correctly?
Is it necessary to correct this?
Can this be done in the miniDSP2x4HD?

 

[alex-z]

Yes, the impulse from the speakers is hitting the microphone 15ms sooner than the speakers.

MiniDSP 2x4HD can apply up to 80ms of delay last I checked.

Time alignment is desirable but not a hard requirement. If the phase alignment is correct at the crossover you can have good frequency response just with extra group delay.