"Scott Dorsey" wrote in message
Arny Krueger wrote:
"David Gravereaux" wrote in message
but
found a datasheet on the 2022 and it looks nice, but it
needs a bi-polar supply input. I need single-ended. I
already have enough buck converters splitting out the
main +48V feed into +/-12V,+5V, and +24V to the other
electronics. I hear you on the integration aspect.
This speaker is well processed using a DSP engine for
x-over, filtering, limiting, etc, so acual response on
paper of the amps doesn't have much merit to the result.
I think their power consumption is sufficiently symmetric
that you
might be able to make them operate with a +48V rail using
a small +24V current as a reference ground. Of course
you will have to AC
couple everything.
For those that noticed, PowerOne makes switch-mode power
supplies, not amps. I meant to say PowerPhysics.
I have some experience with Tripath modules, and in my
tests they did not perform well. One problem is that
they start spewing out a lot of ultrasonic and high
frequency sonic garbage a couple of dBs or more below
clipping.
This is "soft clipping" right?
No, the high frequency garbage is not harmonics of the signal being
amplified.
Also, Tripath modules have the typical switchmode
amplfiier problem of rising source impedance due to the
output filter network. The impedance curve of your
speaker's tweeters can change how they sound. If your
application is the closed system it appears to be, then
this won't be much of a problem as long as you see it
coming.
This is an issue with all of the class D systems in one
form or another, I am sorry to report.
Except those that have complex low pass filters at their output, or use some
kind of loop feedback.
If you check around you will find a lot of critical
statements about Tripath modules. There are some
european designs that get better press.
There is a division of B&O which is making some which
have got very good press, actually. I was not impressed
with their demo at the AES, which
was very glassy-sounding, though that could have been a
speaker issue in part.
I'm not aware of any listening tests of these products that I could call
definitive.
Still, if the staff don't have the
ability and the listening skills to make
a demo sound good, that's not a good sign that they can
make the part sound good either.
I don't put a lot of stock in convention demos, whether the outcomes are
good or bad.
Also, Hegel AS of
Norway has been selling some that have a good reputation.
http://www.hegel.no/index.htm ???
I don't see any references to switchmode power amps.