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In Reply to: Does combining a digital amp, with a digital XO increase chance of artifacts? posted by Duilawyer on March 30, 2008 at 17:11:07:
I built a UcD amp- the modulation of the pulse width is purely analog. No analog to digital conversion occurs. Their are a couple of examples of class D that uses digital modulation, (like the TI chips used in Panasonic XR amps)- but Class-D amplification is not, in itself, "digital" (even if the manufacturer uses that word). Based on the limited info I was able to get on them, I would bet that the amps you are using are do not have truly digital modulation of the pulse width. The "Digital" misconception is primarily fueled by misleading marketing and confusion from people that did not realize that the "D" in "Class D" does not stand for anything- it was just the next letter in the alphabet when the topology was devised.For more info, I would go to the diyaudio- a lot of engineers, people who developed the concepts behind this stuff and people who design amps for a living hang out there:
http://www.diyaudio.com/forums/forumdisplay.php?forumid=49In terms of interaction between digital components and Class D amps- it is not an issue.
In terms of the DCX, you should ideally put the raw digital signal into the crossover (eliminates the A/D conversion step) and then adjust the volume with a preamp after the unit. Otherwise, you will be raising the noise floor relative to the signal when you adjust the volume.
Edits: 03/31/08
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Follow Ups
- Class D/PWM is not inherantly digital - lne937s 14:18:52 03/31/08 (1)
- thanks. nt - Duilawyer 15:22:00 03/31/08 (0)
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