ZEN/SOZ hybrid - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 14th July 2001, 02:22 PM   #11
diyAudio Member
 
Join Date: May 2001
Default Resistors v Constant Current sources

In this particular application the use of constant current sources will dramatically lower the level of second harmonics. However it does lead to greater odd order harmonics which extend to quite high multiples. many people feel that some second order harmonics provides a "pleasant, valve like" sound. On the other hand odd harmonics are generally considered undesireable. Once again just looking a raw specs can be misleading as the THD with constant current sources is much lower, notwithstanding the fact that many prefer a design with resistors.

Hope this helps.

Cheers,

Pete
  Reply With Quote
Old 15th July 2001, 02:55 AM   #12
diyAudio Member
 
Join Date: Apr 2001
Location: Brisbane Australia
Pete,

If resistors produce more 2nd order harmonics and less odd order shouldn't I be witnessing a warmer more relaxed reproduction with this style of amp in comparison to the zen amp?

Dan
  Reply With Quote
Old 16th July 2001, 06:20 AM   #13
diyAudio Member
 
Join Date: May 2001
Default Harmonics

I have never modelled the zen amp so was not comparing different typologies, simply answering your question regarding resistor v. current sources in an op amp. I will be home in a few days and can look at the Zen if you wish to pursue that.

Regarding second harmonic v. higher order, yes I would expect a subjective comparison to suggest a greater level of second harmonic produces a "warm" sound. Depending on their amplitude and multiple, higher order harmonics can produce sound that is described as "harsh", or "bright". If not excessive is sometimes confused as being "more detailed" even though the latter case is not actually true. Describing amps in this manner can at times be a triffle confusing given the symantics involved.

Cheers,

Pete
  Reply With Quote
Old 16th July 2001, 10:31 PM   #14
diyAudio Member
 
Join Date: Apr 2001
Location: Brisbane Australia
Pete,

I have modelled the ZEN and SOZ amps using Circuit Maker 2000 (a spice modeller) but am unsure how to obtain distortion characteristics from such models. Is this possible? If so how would I go about it?

Cheers

Dan
  Reply With Quote
Old 17th July 2001, 06:41 AM   #15
diyAudio Member
 
Join Date: May 2001
Have a look at Fourier Analysis. Circuit Maker does not, as I understand it, provide as much information as is possible using the XSPICE engine, however is possible to model what we are refering to here.

This is from the Circuitmaker web site.

"Fourier Analysis The Fourier analysis shows the frequency spectrum of any waveform. Simply click on a point in the circuit with the Probe Tool to plot the frequency spectrum at that point. You can define the fundamental frequency as well as the number of harmonics."

Cheers,

Pete
  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
Hybrid Car Amp... let's try jeppix Car Audio 19 18th August 2008 06:48 PM
the hybrid one arhi45 Tubes / Valves 11 8th May 2007 09:44 PM
Hybrid Ply / MDF ? Renron Multi-Way 5 8th February 2007 11:49 PM
My wacky idea for a hybrid horn loaded woofer/planar widerange hybrid loudspeaker. Spasticteapot Multi-Way 0 30th November 2006 05:16 AM


New To Site? Need Help?

All times are GMT. The time now is 07:49 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