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Usb power - Page 3

post #31 of 40
3/13/10 at 12:02pm
Quote:
Originally Posted by leeperry View Post
firewire and USB share ground and power w/ the computer host...anyway, I was reading about the Firestone cute amps...and I read you advising against AD797(being "too hot" to you, since when ) and actually suggesting to use OPA2132 instead? http://www.head-fi.org/forums/f5/cut...5/#post6219553

is that just very a misinformed advice, or could that possibly be breaking your agenda to say that USB sucks jitter and power-wise? that seems highly "beezar" to me

BTW: http://www.head-fi.org/forums/f5/cla...4/#post3427064
Blindly repeating other people words does not make something true. USB and SPDIF *both* can suck on jitter. USB can have power issues. And btw, everything shares ground - unless you're on the moon.

My advice to the OP was to try something that do both line and USB power and make the informed choice for themselves.

And what does rolling op-amps have to do with this thread?
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post #32 of 40
3/13/10 at 5:06pm
Who knows. Sounds like he enjoys arguing for the sake of arguing.

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post #33 of 40
3/23/10 at 9:44am
a little bump: http://www.head-fi.org/forums/f133/p...2/#post6500985

but yes, the USB power is very high quality! everyone's wrong on that matter...who needs more than 640kb anyway.

jkeny is not exactly a n00b, and he's not selling USB DAC's
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post #34 of 40
3/23/10 at 10:23am
Hate to quote myself, but:
Quote:
Originally Posted by cobaltmute View Post
What I would say is this though: I agree that the cleaner the power supply the better. Whether that comes from USB or SMPS or a Linear or Shunt, it doesn't matter (at least to me). They are all tools to be used to create the desired result.
All you did was prove this statement. Cleaner supply is better. Happy? Nothing I didn't know already (especially for the clock).

And have you ever actually tried to design a DAC? On a board that is 2"x1"? Maybe then you'll learn about the compromises that happen, as you have to rip out your ideas to make it fit on the board.

Easier to critique than to do.
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post #35 of 40
3/23/10 at 10:52am
the OP was asking whether USB power was clean or just very dirty...he wasn't asking for SQ compromises, otherwise he'd use this: DealExtreme: C-Media CM108 Virtual 7.1-Surround USB 2.0 External Sound Card
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post #36 of 40
3/23/10 at 11:25am
Quote:
Originally Posted by leeperry View Post
he wasn't asking for SQ compromises
So stop posting links to threads linking power quality to sound quality.

Every design is a compromise. It is as easy to find faults with a $1000 unit as a $30 one.
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post #37 of 40
3/23/10 at 7:54pm
This thread sucks, lol.

Also, I'm finding my Dell XPS420 improves significantly as a USB transport when plugged in to my Belkin PureAV power filter. Also a slight improvement with my Monster triple-shielded USB cable, too. *casts Fire Shield on self*
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post #38 of 40
3/23/10 at 8:35pm
Quote:
Originally Posted by Mad Max View Post
This thread sucks, lol.

... Monster triple-shielded USB cable, too. *casts Fire Shield on self*
Now it really does.
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post #39 of 40
3/23/10 at 9:25pm
Thread Starter 
yea this was a whole can of worms I had no idea about.
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post #40 of 40
3/23/10 at 11:01pm
Quote:
Originally Posted by cobaltmute View Post
So stop posting links to threads linking power quality to sound quality.

Every design is a compromise. It is as easy to find faults with a $1000 unit as a $30 one.
humm? you don't need to spend $1K to get a standalone discrete linear PSU and have a galvanically isolated connection between the computer and the external DAC...USB and firewire are doomed to fail, due to their shared ground...and using the computer 5V power to feed the analog circuits is just a terrible idea.

now for $10, it's hard to beat! but many S/PDIF external DAC's can be fed w/ a proper linear PSU(V-DAC, all the Firestone Audio units, etc etc) and cost way less than $300 new...anyway, keep thinking what you want..I think the OP has a rough idea of how "clean" the USB power is now.
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