Effects of magnetic fields

Yes it's possible to hear the effect.

The proximity of my HT sub woofers effect the sonics of my Soundlab Ultimates by disrupting the back-plate (power supply). The sound is improved proportionately by increasing distance between the large woofer and the Soundlab as well as removing the power cord of the sub from the wall outlet.

Guess the Soundlab doesn't like the field from the amp either.

Yes I thought so. I was told today by Chris at Legacy Audio that when they ship speakers on an Airplane by law they must be 18 inches from certain parts of the aircraft because of the magnetic field. Also I notice the performance of my Audio Magic Eclipse PLC seems to waiver if its in too close in proximity to large woofers. Also my speakers tend to sound better if they are spead apart further than conventional suggestions. Could it be because when they are spead out , they are further from my electronics ? Interesting.

I'm still trying to figure out what the magnet in a Verdier TT must do to the field around a phono cartridge. Must not be a problem but you would think there would be some effect.

Albert is their any way to easily measure it ? Do not know too much about it , except I believe the positive magnetic field generally moves forward, the negative , backwards , as in the back of the speakers, is that correct ? I wonder, in the context of how my equipment always seems to sound different depending upon where it is placed in my room . Trying to do Audio and Video, their are so many variables . Thanks !

Changing the position of your speakers will change how they sound mostly because of how they are interacting with the room and their relationship to your listening position. Im most situations these factors will far outweigh any effects due to magnetic fields. All of your equipment is also affected by the vibrations in the room and the strength of these vibrations is different at different points in the room.

If you move equipment other than the speakers and the hum level goes up or down then that is probably due to magnetic fields, but if some other aspect changes with no difference in hum levels then that is probably due to differences in pressure (vibration) levels.

You are correct, there are many variables and it is difficult to isolate them.