Maynard G. Krebbs wrote in message . ..
On Tue, 09 Dec 2003 19:00:29 GMT, "Doug"
wrote:

Some marine speakers include shielding so that they can be placed closer to
a compass (I am NOT suggesting right next to a compass). Unshielded speakers
are a frequent cause of "my autopilot doesn't work on some headings"
problem.
Doug K7ABX
"m Ransley" wrote in message
...
.
Are marine stereo speakers just high quality car speakers. As those
with rubber surrounds and plastic cones and dust caps. If not what
would be the differences. Thanks



I know you can shield RF and other electronic interferance but how can
you shield magnetic interferiance?
Mark E. Williams

Most marine speakers are manufactured with rigid plastic baskets (the
part that the cone and magnet are glued to) and shields that keep salt
water out of the voice coil assembly (because most magnets have a high
component of ferrous, or iron that rusts).

If you buy a regular pair of high end car speakers, they will sound
great for a season, then rust out.

Alec