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RE: magnetic interference.....

There is no magnetic interference by additional Mch speakers that affects stereo playback. It is a myth with no proof either theoretical or empirical. There is insufficient stray magnetism from most speakers in a Mch setup, given the distance separating them. Mch speakers should never be "in close proximity" to the main front channels used for stereo.

Decades ago, Ivor Tiefenbrunn of Linn theorized that unused, additional speakers in the room affected playback, as in showrooms. But, that was based on the unused speaker drivers absorbing acoustic energy in the room via induced movement of their drivers, not magnetic interference. However, if the unused speakers are shunted - shorted across + and - terminals - the speaker drivers cannot move and they cannot absorb acoustic energy via driver movement any more than any other object in the room. It is elementary physics. Sure, any objects in the room might possibly affect room acoustics somewhat, whether they be unused speakers or ironing boards or potted plants. Careful about that watch on your wrist or the clothes you wear when listening. They might affect room acoustics, too.

If it is a concern though, connecting unused speakers to an amp in most cases accomplishes the same electrical shunt, though that may require that the amp be powered on even if delivering no signal.

Magnetic interference by stray magnetism from speakers caused a video issue only with old CRT displays because the sensitive CRT raster scan was magnetically controlled, But, that was true only if the speakers were magnetically unshielded and if they were placed in very close proximity to the CRT, as in right next to it. Usually, a foot or two of separation eliminated the problem. Modern video displays have no such problem.

So, this whole thing is like chasing unicorns. Stereo playback is perfectly fine even with Mch equipment in the same room.


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