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Perceived volume vs. mathematical volume.

#81
a bit off topic but the 100w ashdown five 15 (a cheap model, so the decision is understandable) actually cuts out the speaker when an extension cab is put in. "here is my big head with a unused 15" speaker attached to it". i dont know much about bass gear, but eden seems to make thigns that arent in the beginner combo market so much.
 
#82
black_labb said:
a bit off topic but the 100w ashdown five 15 (a cheap model, so the decision is understandable) actually cuts out the speaker when an extension cab is put in. "here is my big head with a unused 15" speaker attached to it". i dont know much about bass gear, but eden seems to make thigns that arent in the beginner combo market so much.
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Yeah, that's a strange one. I think I probably agree with the post earlier in the thread about a marketing person saying "Hey, we need an extension jack as a sales point!"

Cheers
 
#83
DavePlaysBass said:
Getting the music signal modulated into a pulse width modulated drive signal of course can introduce distortion. I have scanned a number of articles talking about increasing fidelity with switching power amps, but they usually are talking fancy DSP algorithms. In my work enviroment, I get to define what the DSP does, but someone else makes it tick.
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John Vanderkooy has done a lot of research into the distortion mechanisms of class D modulators. He has proposed several methods for reducing distortion to acceptable levels. (Audio class D modulation is a task that isn't quite as really simple as it seems.)

Dr. Vanderkooy gave a presentation on class D to the LA section of the AES a few years ago. Here is the PDF from his slides and transparencies (unfortunately, the PDF doesn't also include his commentary): Invalid Link Removed

When Pat Quilter (the "Q" in QSC) designed the PL380, he based its modulator stage on the techniques proposed by Vanderkooy, as the two often bounced ideas off each other. Although there was never an officially recognized "Vanderkooy modulator," Pat calls the one in the PL380 by that name.
 

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