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Sub Alignment [message #86293] Tue, 22 December 2015 12:56 Go to next message
leetonne is currently offline  leetonne
Messages: 2
Registered: December 2015
Junior Member
Hello,

there are two Instruments for phase analytics in SpectraFoo, the Transfer Function and the Phase Torch.
What is the "best practice" for aligning the subwoofer and the high/mid loudspeaker?

Best regards
leetonne
Re: Sub Alignment [message #86294 is a reply to message #86293] Tue, 22 December 2015 13:06 Go to previous message
jon is currently offline  jon
Messages: 39
Registered: November 2012
Member
Hi Leetonne,

We would recommend using the Transfer Function.

When your response signal contains the subwoofer energy only, it is giving you only a subset of your source signal's frequency range, this creates a lot of interference for the transfer function, and leads to the inconsistency that you may see in the results. You have a few options you can experiment with here. You could either try band-limiting the source noise channel in the same way that your sub is band-limited, or what we have found to work well is to shoot the sub while you are shooting the mains:

Open the capture control window and make a capture of the impulse while you are computing the delay. Then in the capture overview, under Ribbons, select the Spectral History. Here you will see the impulse, but with a more smeared lobe toward the bottom, representing the low end. Control-click on the delta symbol to set whether you want to measure in seconds or samples. You can then place the cursor at the impulse and click the rounded arrow on the left to set the start point. Then set the cursor at the center point of the low end lobe and click the rounded arrow on the right, and the delta will be your delay time for the sub.

The location of the lobe may also point to potential phase alignment issues in the subs, so that is something to be aware of.

I hope this is helpful.

Best regards,


Jon Stern
Metric Halo Support
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