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RE: different Amps, Different DACs, alignment issues?

Posted by dumpingground (A) on March 28, 2023 at 11:38:18

In Reply to: My DIY Story: nanoDIGI DSP based active crossover and 4 subwoofer integration posted by dumpingground on March 17, 2019 at 16:15:16:

I am back at tweaking my active DSP based crossover setup. I am presently using a Pass Aelph 3 clone Class A amplifier on the tweeters and a old Panasonic XR-57 Power DAC Digital Amplifier on the woofers. This replaces the two Parasound HCA-1000 discussed in the original thread here.

The sound is really very good with the Class A amp on the tweeters and the Class D amp on the woofers. However I was concerned that the different paths and amps would introduce a significant difference in delay/latency and cause timing alignment issues between the tweeter and woofer panels.

With REW I measured. Ignore the differences below 60hz since the two measurement setups with sub cut off frequencies are different in that region.

If you look at the OEM crossover measurement (first graph) you can see that the woofer and tweeter regions appeared pretty aligned. However with the Nanodigi setup (second graph) with the different DAC's and Amplifier paths the two drivers are off by about 30msecs. The nanodigi allows me to add delay but maxes out at 9msecs which is not enough to compensate for the 30msec latency differences.

What are peoples thoughts on the alignment issues and what sound listening issues I may be introducing to myself with this experiment? The Panasonic XR57 is an AVR with several distance and speaker size settings. I have gone in and turned all of that off for this experiment.

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