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RE: 20.1 deqx tri amp xover points

Posted by emailtim (A) on April 23, 2021 at 18:51:55

In Reply to: RE: 20.1 deqx tri amp xover points posted by Blaine H on April 23, 2021 at 12:21:42:

Hi Blaine,

FWIW, my HDP3 is fully balanced with the Jensen transformers.

This experiment in different sample rates maybe of some interest to you. Each doubling of sample rates pushes the right side inconsistencies higher out of the audio band (44.1/48, 88.2/96, 176.4/192, etc.) with phase being the worst culprit starting well into the audio band.

https://db.audioasylum.com/mhtml/m.html?forum=mug&n=245047


As far as FIR filters are concerned, each doubling of sample rates requires a doubling of taps to achieve the same filter at each of the respective native rates (e.g. 64K @ 48kHz, 128K @ 96kHz, 256K @ 192kHz, 512K @ 384kHz, etc.). More taps require more processing power which is why many devices are tap limited.

Lower frequencies also require more taps than higher frequencies. This presents itself in DEQX by allowing a steep slope XO to be made at higher frequencies, but not at lower frequencies. If you make the slope shallower, you cam lower the XO frequency until it hits its processing limit again. RePhase presents this behavior by displaying that the desired target filter and actual filter (red and blue) plots don't exactly overlay each other. When you increase the tap count and reprocess the filter, the red and blue plots will move closer until a sufficient amount of taps are used at a filter's given sample rate. If they overlap perfectly and you increase the sample rate too much, they again don't match giving you visual feedback of insufficient taps.




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2022/03/30 Historical Records CENSORED

• Sample Rate Test Plots   (Open in New Window)

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