|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
50.200.188.134
In Reply to: RE: Phase Response Effects. . . what? posted by Schlep on January 28, 2016 at 07:55:28
to add to what Airtime has said-
if the goal is to generate a series of wave forms that approximate the real live event- they all transducers/drivers should be 'aligned' that is working together- if a driver is Out of Phase (usually expressed in degrees - like a circle) then the contributions of that driver will at best be diminished, at worse cancel out the efforts of other drivers where frequencies overlap-
Happy Listening
Follow Ups:
Phase is just a measure of time relative to frequency. You can configure a multi-way loudspeaker to have a nice Phase response (Step response in a Stereophile Review) for s place is space relative to the driver. All other places the phase response differs... it's not in phase.
The brain uses timing variation between the ears with similar signals in the mid and low frequencies to assist in location. It is fairly precise tool for live sound, though it can be fooled as well. In stereo reproduction, however, the brain isn't sensing "Real" it is sensing "fake" and has to process what "might be real" and imagine it!
How the individual signals are recorded, and modified in the production process virtually never preserves phase (Binaural and a other specialized methods excluded). Nor the producer and engineer have to create the illusion of direction and do so using many techniques.
In the end, however, playback systems that preserve phase and those that don't can do a fine job of assisting us listeners in creating the illusion.
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
An example of phase knowledge is in crossover designs. Mainly to the tweeter and to a lesser extent to the old Midranges - remember them? This is to compensate for the crossover becoming a problem and causing a phase problem. ORR to diminish the added padding/crossover components simply by reversing the wire leads.
Yes, I remember considerable ink spilled over the 'slope' of a crossover, and whether it inverted phase - or merely shifted it (90 degrees versus 180)...
Then there were the questions about gain stages...
and who could forget the "Wood Effect"...
Happy Listening
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: