Sylvain VAN DER WALDE wrote:
"mike" wrote in message
. 1.4...
"dave sanderson" wrote in
ups.com:

Can anyone tell me which is positive and negative please.
|
|It generally doesnt matter, as long as they are wired the same.
|Id put the stripe to +ve, but its personal preference

It matters if you are using stereo. If a speaker is wired the wrong
way round it produces sound 180 degrees out of phase. Not that I
could hear the difference.
Que? if one is wired one way, and the other the other way they will be
180 deg out of phase with each other, and the result will be a loss of
low frequencies (very technical explaination skipped, bu I can post it
if you want), but both wired backwards makes no odds on most speakers.
I think Dave is quite right on this; the problem is that real sounds are
asymmetrical - consult any trumpet and oscilloscope.



So although there would be no audible difference on sine waves, any other
sounds would be turned upside down, and golden ears can hear this. I
confess I never could, but nevertheless was made to keep the phase right
from source to direction of music of the speaker cone, as any purist
broadcasting organisation, if there are any left, would


Yes. Not only did I notice a lack of bass, but the sound seemed "strange".


Thats mostly ********..out of phase speakers - yes..you lose the bass
and the stereo image goes weird..but a phase reversal overall?

If you have ever been anywhere near a recording studio you will see that
phase reversal is all over the place in every single stage, and that
phase shifts happen too..you don't even want to think about what a
pre-digital recorder does to the phases of signals at different
frequencies...or what a concert hall does to the sound when it bounces
off the walls and people..or what a simple movement of your head does;-)


Sylvain.
mike