Effects of magnetic fields

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.

Darrylhifi,

The effect I heard was from moving the sub woofer SIDEWAYS, away from the Soundlab Ultimates.

Since the Soundlab is a dipole, the sub at it's side has very little effect acoustically. Anyway, I'm discussing the sound with the sub woofer (un- shielded box) in an inoperative state, merely it's presence both magnetically and electrically.

The magnetic field in the sub is strong due to the 15" woofer and even worse, the built in plate amp (200 watt) effected the power supply of the Soundlab. I assume the step up transformer or bias circuit was being effected but cannot say for certain.

Herman is correct that moving speakers have great effect sonically but in this instance the sub was definitely effecting the Soundlab, other than acoustically.

Since magnetic fields are so easily seen on televisions when speaker fields are near I don't see much stretch in imagining it could effect some circuits during music playback.