The difference is one is static phase error and one is dynamic phase error.
I am referring to dynamic phase error caused by the amplifying process.
If you have a dynamic speaker with tweeter, mid and bass drivers and they are time aligned (distance from you ear and delivering a coherent sound) and you add a shim under the back of the speaker stands so they are now tilted down slightly - you would still be able to hear the music but the coherency will be off by the same amount all the time. this is due to the physical maneuvering of the cabinets (mis-aligned). The tweeter is now somewhat closer to you and so the highs will now arrive too soon.
This is an example of a static phase error. if you had someone take your speakers and rocked them back and forth while you were listening - that would be dynamic phase errors. It is a process of modulation not tilt.
A tilted speaker still gives you a view of the soundstage (but from slightly different view)
A modulated speaker cabinet will cause the sounstage to blurr like a shake table. Under those conditions it is difficult to nail down where everything is.
Bottom line - even with perfect bolted down loudspeakers with good coherency they cannot project a stable image due to the dynamic modulation of the velocity fed to the speakers by an unstable amplifier.
90% of all system problems are from the electronic amplifiers.
10% is all the cables, power cords and magic pebbles.
Phase modulation is gross amounts of distortion since your entire perception of a live soundstage depends on objects not shifting around during the playback process. (like someone shaking you speakers)
It is literally the same thing as a photograph taken out of focus.
Remove the shaky nature of the display and everything is stable and in focus.
That can only happen inside the amplifier circuitry.
Roger
I am referring to dynamic phase error caused by the amplifying process.
If you have a dynamic speaker with tweeter, mid and bass drivers and they are time aligned (distance from you ear and delivering a coherent sound) and you add a shim under the back of the speaker stands so they are now tilted down slightly - you would still be able to hear the music but the coherency will be off by the same amount all the time. this is due to the physical maneuvering of the cabinets (mis-aligned). The tweeter is now somewhat closer to you and so the highs will now arrive too soon.
This is an example of a static phase error. if you had someone take your speakers and rocked them back and forth while you were listening - that would be dynamic phase errors. It is a process of modulation not tilt.
A tilted speaker still gives you a view of the soundstage (but from slightly different view)
A modulated speaker cabinet will cause the sounstage to blurr like a shake table. Under those conditions it is difficult to nail down where everything is.
Bottom line - even with perfect bolted down loudspeakers with good coherency they cannot project a stable image due to the dynamic modulation of the velocity fed to the speakers by an unstable amplifier.
90% of all system problems are from the electronic amplifiers.
10% is all the cables, power cords and magic pebbles.
Phase modulation is gross amounts of distortion since your entire perception of a live soundstage depends on objects not shifting around during the playback process. (like someone shaking you speakers)
It is literally the same thing as a photograph taken out of focus.
Remove the shaky nature of the display and everything is stable and in focus.
That can only happen inside the amplifier circuitry.
Roger