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Solve 3rd August 2006 09:27 PM

Tripath a phase fake?
Since im have a past sound enginer experiance and also is musician and use delay a lot i wonder...
Is it a delay fake?
My slowly brain just got open when i read Geoof's
listening test of T-HiFi Micro-TI integrated amplifier.

"Though digital amps have had rave reviews and are without question fabulous value for money they are not perfect. I still feel they are a little grey and soulless, and sometimes I get the feeling that their soundstaging can be just a bit artificial, almost as if they are messing about with phase."

Have sombody messured the channels?
I mean Left and Right together?
It could be very small delays.
Not on on whole spectra.
I dont know.
Just wonder...

Still think its sounds amazing!!


Pano 3rd August 2006 09:58 PM

I have found phase on the Tripath outputs to be strange, but have not pushed the study very far.

It is worth looking into.

BWRX 3rd August 2006 10:04 PM

Well, as with most class d amplifiers the output pulse train has to go through a low pass filter to recover the audio information. What is an often undesirable side effect of passing a signal through a filter? You guessed it - phase change. Of course this change should be gradual and only affect the upper end of the audio spectrum if the filter is designed properly.

Solve 3rd August 2006 10:09 PM

And the upper end filter is designed properly at Tripath?
Just wonder.


BWRX 3rd August 2006 10:24 PM

It doesn't matter if Tripath designed it properly. They just offer you some design guidelines. It's up to the designer to choose to follow them. I've used components based on their filter guidelines (10uH inductors, 0.47uF caps for 4ohm load, 0.27-0.33uF for 8ohm load) and really enjoy what I hear. Certainly doesn't sound like an artificial soundstage to me. That could very well be caused by a poor recording, improperly set up speakers, improperly designed speakers, or the output filter reacting strangely with a certain speaker's crossover.

Solve 3rd August 2006 11:35 PM

I still want to see an messure between Left and Right and see
if they have the phase fake as i belive.


classd4sure 4th August 2006 12:07 AM

Do amps normally specify phase delay between channels?

Tripath aside I have listened to a single channel driven by a class d amp for extended periods (only had the one amp).. it sounds like it sounds. The actual phase shift at cut off which is usually well above 20khz is likely to be alot less than in your typical commercial junk, probably more on par with high quality amps with bandwidths of 100kHz, some of which are also likely to use coils in their outputs. Just my guess on the issue.

Solve 4th August 2006 12:17 AM

We still talking about stereo?
If i mix a part- as an sound enginer- i sure want to know its in phase.
The offphase i put in myself.
So, i never would mix with an Tripath chip in an studio
before i got an clear statement that it is no phase problem with


classd4sure 4th August 2006 12:19 AM

Yep, I was just saying listening in mono doesn't change sonics in any significant way.

Back to your regular stereo broadcast:

I actually dont' recall ever seeing such information posted for your "typical" amp either. It would be interesting to do a full comparison across several models, not just tripath.

What's your threshold for considering it off phase anyway.

Solve 4th August 2006 12:23 AM

Back to my topic.
Still want an messure in stereo and see how much delay it is.
Compared to others of course.
I dont know if somebody do it or how they do it.


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