Tripath a phase fake? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd August 2006, 10:27 PM   #1
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
Default 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.

http://www.tnt-audio.com/ampli/micro-ti_e.html

"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!!


Solve
  Reply With Quote
Old 3rd August 2006, 10:58 PM   #2
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
I have found phase on the Tripath outputs to be strange, but have not pushed the study very far.

It is worth looking into.
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 3rd August 2006, 11:04 PM   #3
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
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.
__________________
Brian
  Reply With Quote
Old 3rd August 2006, 11:09 PM   #4
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
And the upper end filter is designed properly at Tripath?
Just wonder.

Solve
  Reply With Quote
Old 3rd August 2006, 11:24 PM   #5
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
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.
__________________
Brian
  Reply With Quote
Old 4th August 2006, 12:35 AM   #6
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
Well...
I still want to see an messure between Left and Right and see
if they have the phase fake as i belive.

Solve
  Reply With Quote
Old 4th August 2006, 01:07 AM   #7
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
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.
  Reply With Quote
Old 4th August 2006, 01:17 AM   #8
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
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
Tripath.

Solve
  Reply With Quote
Old 4th August 2006, 01:19 AM   #9
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
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.
  Reply With Quote
Old 4th August 2006, 01:23 AM   #10
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
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.

Solve
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Are these fake? glen65 Solid State 30 7th July 2007 05:45 PM
KEF driver phase and the H-B generated phase dlr Multi-Way 11 24th April 2007 12:56 PM
Fake Law Log Pot DolbyR Parts 7 17th January 2006 11:55 PM
Law fake pot Nordic Chip Amps 10 25th November 2005 12:33 PM
dipole sub H-Frame, phase or opposite phase ? mbon Multi-Way 6 19th June 2004 09:36 PM


New To Site? Need Help?

All times are GMT. The time now is 03:57 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2