|
Critic's Corner Discuss a review. Provide constructive feedback. Talk to the industry. |
|
|
|
Critic's Corner Discuss a review. Provide constructive feedback. Talk to the industry. |
|
In Reply to: RE: August Stereophile Amplifier Measurements - an observation, or two. posted by John Atkinson on July 14, 2014 at 16:24:21:
Hello John,
Just thought you should know that 'hot and cold' is a concept that does not apply to a balanced circuit of any kind- such associations lead to confusion.
There is 'inverted' and 'non-inverted'. Neither is 'hot' and neither is 'cold'- each signal has the same value. Balanced connections are not compatible with single-ended connections; the use of 'hot' and 'cold' often leads to the idea that there is compatibility (and a lot of hum/buzz problems as a result).
The reason balanced connections are not compatible is that a balanced system ignores ground. Many years ago you measured one of our preamps and found a large amount of diode noise; this was because the tester you used (Audio Precision) at the time made all its measurements from ground- and hence was not able to really test a real balanced-line product. Imagine an output transformer with no center tap and no connection to ground driving an output: pins 2 and 3 of the XLR, with ground being the circuit ground and nothing more. You have an incomplete connection if you measure from ground to either pin. IOW the output occurs between pins 2 and 3 and nowhere else. This is how a true balanced line connection works.
So I thought I might take this opportunity to point this out as after all these years there still appears to be many misconceptions in the high end audio community regarding balanced line operation- this one being one of the more common ones.
All the Best,
Ralph
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: hot and cold... - Ralph 14:34:16 07/15/14 (1)
- +1... - Ivan303 19:08:07 07/17/14 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
