Time align the impulse of the Sub

[FidelioX]

Hi Guys,
I'm following this tutorial....

At min 52 he explain how to time align the impulse of the sub respect the reference loud speaker.

My personal array is made with two subs aligned togheter with MiniDSP.

Now I've done a test following this video and tryied to time align the sub.
He says that the peak to be taken as a reference is the highest one ... in my case it seems the following red arrowed....

But in my case it seems abnormal because I read 15 meters of delay!!!
My Denon has a maximum of 8 meters.
There is surely something wrong!

I attached those readings.

Thank you so much for any feedback

 

[Michael_B]

I know hes says somewhere in the comments to someone else, that if you cant use the highest spike, just use the first spike.. i have seen his videos many many times, and still need to see them more to understand it

 

[Michael_B]

heres what he wrote : "If you can't decrease the delays in MiniDSP and I know you can't, your only option is to adjust sub impulse timing not to the highest peak but the peak before that"

 

[John Mulcahy]

Unfiltered impulse responses are next to useless for sub alignment. The alignment tool was made for that job.

 

[FidelioX]

Unfiltered impulse responses are next to useless for sub alignment. The alignment tool was made for that job.

Hi John,
I'm totally ignorant on the subject but ... what i intended is that the aligment tool is useful to find a delay value that do not produce bad deeps in the transition between a loud speaker and a subwoofer. But ... my fear is that i may find with the aligment tool a delay value that gives me a very good response without deeps but ... the sub sounds not synchronized with the loud speaker.
Is it possible?
This is my big doubt.

 

[John Mulcahy]

Not really, no. It isn't particularly meaningful to talk about an arrival time for low frequencies, given how long it takes to complete even a single cycle, but if you want a time domain view the 5.20.14 alignment tool can use filtered impulse responses or phase, generally they give the same result unless the alignment is attempted at a response null. Phase is (broadly speaking) the frequency domain equivalent of time.

 

[FidelioX]

Not really, no. It isn't particularly meaningful to talk about an arrival time for low frequencies, given how long it takes to complete even a single cycle, but if you want a time domain view the 5.20.14 alignment tool can use filtered impulse responses or phase, generally they give the same result unless the alignment is attempted at a response null. Phase is (broadly speaking) the frequency domain equivalent of time.

Thank you John,
I will install it tonight.
Can you provide more specific infos to use this new functionality? (some captures would be much appreciated).

Thank you if you can

 

[John Mulcahy]

There are a number of threads about the alignment tool, such as https://www.avnirvana.com/threads/loopback-method-trying-to-get-it.11200/ and https://www.avnirvana.com/threads/rew-alignment-tool-guides-or-manual.6814/.