Originally Posted by alan0354
Let me clarify, this is very important for me. I don't know what you mean about CD changes phase on the recording. Do you mean this only affect the sound on this particular CD player.
Put it in another way, when you use other sources like streaming, vinyl etc., does the sound change if you reverse BOTH speaker cables AT the same time?
I am at the first phase of designing a new front end of a power amp, the natural state is inverted phase, I have to put extra circuit to invert back to the conventional phase following all the amps. So this is really import information for me.
In electronic theory, it should absolutely not make any difference in sound as long as you switch both speakers at the same time. BUT I do trust the ears more than scientific theory!!! Surprise surprise!!!!
Got it. So we are not talking about phase cancellation but the what happens when phase is reversed in a stereo system.
The Chesky CD will play correct and inverted phase on one of its test tracks so you can experience it for yourself. It's a test CD. And yes, I did hear the difference.
A few things come to mind with what happens when phase is reversed. Bass is reduced, stereo imaging suffers and highs get dispersed. Not airy, but unnaturally wide.
From the interwebs -
Bass tones are generated in part by the pressurization of the air in the space surrounding the speaker. When the signal is out of phase, the bass speaker moves in when it should move out. Bass drum notes become virtually inaudible, and the music loses its muscularity and impact in the process.
Imaging occurs when a pair speakers successfully "projects" an audible representation of the instruments in front of you. When a speaker is wired out of phase, this information becomes out of focus, and sonically disorganized. This is especially true since the other drivers in the speaker cabinet are affected. Mid-range frequencies are present in the bass and tweeter drivers. Reversed wiring causes dynamic stereo information to "collapse," making the music lose much of its impact.
High frequencies lose their focus when a speaker is miss-wired. This results in an "airy" treble that causes the sound stage to sound larger (yet less defined) between the speakers.
The brain uses the amplitude difference between the signals reaching the two ears above about 2kHz, but below about 700Hz, it determines direction by looking at the phase difference between the signals. Reversed polarity will change the presentation of the track.