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Well, THAT's Not Gonna Fucking Work!
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<blockquote data-quote="Mark DeArman" data-source="post: 39891" data-attributes="member: 950"><p>Re: Well, THAT's Not Gonna Fucking Work!</p><p></p><p>I guess the point I was trying to make with all the measurements was this behavior is not unexplained. I also measured the Xilica, Ashley, and BSS and they all do the same thing in the LF. This is because they are all AC coupled DSPs. The difference with the others compared to the Drive Rack 480 is that the HP filter phase response crosses zero deg before 20 Hz. All of my AC coupled Endevco Microphone preamps have a cutoff of 0.5Hz. For the dbx products they obviously chose 10Hz.</p><p></p><p>Now the fact that the phase response changes with the filter sections is obvious. The slope should increase as the order gets larger, even when it is marked as OUT. This seems to be true from the other posts but I did in fact not measure it myself.</p><p></p><p>The only thing I have not been able to produce is Bennett's original data showing the HF phase rising as if there was a notch filter near by. I haven't looked into this very much. Like I said previously it could be the RF choke, part of the AA filter at 24kHz, etc.</p></blockquote><p></p>
[QUOTE="Mark DeArman, post: 39891, member: 950"] Re: Well, THAT's Not Gonna Fucking Work! I guess the point I was trying to make with all the measurements was this behavior is not unexplained. I also measured the Xilica, Ashley, and BSS and they all do the same thing in the LF. This is because they are all AC coupled DSPs. The difference with the others compared to the Drive Rack 480 is that the HP filter phase response crosses zero deg before 20 Hz. All of my AC coupled Endevco Microphone preamps have a cutoff of 0.5Hz. For the dbx products they obviously chose 10Hz. Now the fact that the phase response changes with the filter sections is obvious. The slope should increase as the order gets larger, even when it is marked as OUT. This seems to be true from the other posts but I did in fact not measure it myself. The only thing I have not been able to produce is Bennett's original data showing the HF phase rising as if there was a notch filter near by. I haven't looked into this very much. Like I said previously it could be the RF choke, part of the AA filter at 24kHz, etc. [/QUOTE]
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