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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th May 2006, 01:20 PM   #71
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I didn't mean to imply a noticable hiss from afar. More like with your ear next to the tweeter. I have heard plenty of SI's, the AMP1-B's I built, and an AMP1 that all have this hiss.

Maybe I'm expecting too much from these amps, but from what I've read about the ucd modules, they are completely silent.

EDIT: Forgot to mention this was with no source connected and the inputs shorted.
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Old 30th May 2006, 05:22 PM   #72
BWRX is offline BWRX  United States
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The first demo board was shipped out today. If we're lucky, we'll get some feedback on it in a couple weeks or so

I'm almost finished with the second demo board as well. I hope to send it out tomorrow or Thursday.
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Old 2nd June 2006, 12:04 AM   #73
BWRX is offline BWRX  United States
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The second demo amp was sent out today! It should take about a week to get to Hawaii... hint
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Old 2nd June 2006, 11:38 AM   #74
Pano is offline Pano  United States
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Quote:
Originally posted by BWRX
It should take about a week to get to Hawaii
Hmmmm.. wonder who that one is going to?
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Old 2nd June 2006, 11:42 AM   #75
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Dog The Bounty Hunter?
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Old 6th June 2006, 05:02 AM   #76
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Hey Brian,
The amp came today, but I was at the beach. Will pick up at P.O. tomorrow morning.

Once I get the PSUs up and running I'll give it a hard listen.

Mahalo!
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Old 6th June 2006, 09:42 AM   #77
BWRX is offline BWRX  United States
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Great! Have fun listening.
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Old 6th June 2006, 04:37 PM   #78
amt is offline amt  United States
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Default Well, I think you can keep the name

Well, so as not to keep everyone in suspense for too long, I will say that Im quite impressed with Brians design. Ive not done near enough listening to give any concrete discriptions yet, but I will say that my initial observations are that this is really an excellent sounding amp, with the best LF response Ive heard from a Tripath yet. The separate 5V supply completely eliminates the thump on problems and so far, it may have the best 3-D soundstage Ive heard. Very low noise it appears. Most notable is the detail in very complex compositions. The separation of instruments and the decay of strings is wonderfull!!

But I dont want to commit to too much until Ive really put in some time with this amp and have a better handle on its exact performance qualities. Being giddy with new toys can sometimes steal away ones objectivity.

Michael, you'll be in paradise soon! Oops, forgot you alreally are:^)

BTW Brian, the SMD LED on the board is a nice touch. Nice to know theres DC on the board once the PS is turned on.

Stay tuned.

amt
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Old 6th June 2006, 05:13 PM   #79
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AMT, your observations are as I suspected for Brian's separate supply design. Several months ago I installed a second Charlize in my system, giving a dual mono (separate supply) system. The differences I heard were what you say: detail, bass, separation, decay, soundstage. The more "separate supply"d the better, ey?
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Old 6th June 2006, 11:08 PM   #80
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Got the amp today, am listening to it now - Steely Dan.

Well.... This ain't your grandmother's Sonic Impact!
Very strong, good bass, lots of low mid. Plus all the detail of the Tripath chip. It sounds as good on Latin music too.

Good work BWRX!

What 1st impressed me about the amp board was how well it is made. Beautiful work. From now on we will just refer to BWRX as "the Robot". No human should be able to solder SMD that well. It just isn't possible. And those inductors!

I'll be listening to it more over a couple of weeks- unless Brian wants to sell it. Will give my impression vs. other t-amps. So far, I agree with AMT above. Sounds as strong as an AMP6 with maybe more channel seperation.

Measurements will come, too, of course.
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