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Question about delay 11 years 8 months ago #4260

  • JRJ
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Hello everyone.

I have a question about the delay in MiniDSP 2x4 when using the 2-way advanced plugin.
In my system, I use the MiniDSP as a HP/LF filter for my main speakers and my subs at 80Hz. I then add a biquad LT filter for the subs and eliminate some room modes with the PEQ, both for the subs and the mains.
Theraefter I want to add some delay for either the mains or the subs (probably for the mains) to make them perfectly aligned in time, so to say.

But this is where my problems start.
My measurement equipment measures the distance to the speakers using a frequency swep from 20Hz - 20kHz. And without the higher frequencys, the measurements become quite inaccurate.
So, I need to change the LP filter from 80Hz to say 800Hz to get some more accurate reedings on the subs.
But will this affect the delay in the MiniDSP? Will it take more time to process the LP filter at 80Hz then at a higher frequency?

If so, maby I can just change the LP filter to a HP filter, still at 80Hz?
Just to get the same "processing delay" in the MiniDSP, but be able to measure the correct distance to the subs.

Best regards

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Re: Question about delay 11 years 8 months ago #4282

  • devteam
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@ JRJ,

When it comes to time alignment techniques, John's review at Hifizine provides a step by step method that couldn't be explained in more detail I believe.. :-) Please have a short read at it to see if it helps. www.hifizine.com/2011/03/refining-a-4-wa...speaker-minidsp-2x4/

Using a software able to define a "sweep region" (.e.g.50-1kHz) is what you should be looking for I think. What really matters here is "time alignment" at the crossover region (i.e. where the 2 drivers overlap in the frequency response). So no need to sweep till 20kHz. Your sub doesn't go there. :-)

Hoping we clarified a bit and that the article from John Reekie will help.

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Last edit: by devteam. Reason: Typo
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