They are, actually... though we're usually only on a landlocked river....

-j


"chuck" wrote in message
...
Before you cut into the boat, are the speakers magnetically shielded so as
not to interfere with your compass?

Jeff Morris wrote:
Jay wrote:

So I finally found a set of speakers that seemed like a good enough deal
and they came in last week. I'm wondering if anyone has any
input/experience installing speakers. They aren't flush mount which
needs I'll need to be cutting a few holes... some of my curiosity lies
in wondering if there's any certain saw blades one should use for
cutting fiberglass.... I was going to just drill a few holes to start a
hand jig saw... maybe tape up the area with duck tape to avoid
scratching.. other than that I didn't really know if there was anything
one should take precaution with.


I've used a RotoZip for this - much easier than a Sabre Saw. If its
simple glass it goes through it very quickly. Mine were in the cockpit
seats which had a 1/2 ply backing, so I went though 3 or 4 bits for both
holes. Tape the area with masking tape, draw your circle, and have a
helper with a vacuum to keep the dust down.


Also, though they weigh a couple pounds each, should I worry much about
providing some of support to the backing... like a brace to dissipate
weight on the fiberglass walls?


You shouldn't need support, but you could glass in some marine ply
before or after you make your hole.

Those speakers are not magnetically shielded. That is not a problem as long
as you keep them away from the compass...e.g. 5 feet or so.


"Jay" wrote in message
...
They are, actually... though we're usually only on a landlocked river....

-j


"chuck" wrote in message
...
Before you cut into the boat, are the speakers magnetically shielded so
as not to interfere with your compass?

Jeff Morris wrote:
Jay wrote:

Some folks recommend a minimum of 3 meters or ten feet
separation. Wouldn't hurt to conduct a test. Probably best
done with the boat out of the water so it can't move during
the test.

May not be a problem at all on a landlocked river, but other
readers might be more concerned about the effects of strong
onboard magnets on offshore navigation. Some modern speakers
have amazingly powerful magnets.







JimH wrote:
Those speakers are not magnetically shielded. That is not a problem as long
as you keep them away from the compass...e.g. 5 feet or so.


"Jay" wrote in message
...

They are, actually... though we're usually only on a landlocked river....

-j


"chuck" wrote in message
...

Before you cut into the boat, are the speakers magnetically shielded so
as not to interfere with your compass?

Jeff Morris wrote:

Jay wrote:

Don't put the holes through the hull below waterline.

Just a thought

jofra

"Jofra" wrote in message
...
Don't put the holes through the hull below waterline.

Just a thought

jofra


I hope he doesn't put hole through the hull anywhere on the boat for this
speaker installation. ;-)