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 Speakers too close to Compass?		  New Topic  Topic Locked
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Scooter
Navigator

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USA
228 Posts
Initially Posted - 01/29/2008 :  16:32:34  Show Profile
My depth sounder and knotmeter are toast. The depth sounder is a no-brainer but I have a question about the hole left by the knotmeter. I plan to fill the lower hole (Starboard side of main hatch) with a waterproof speaker for the VHF. The compass is on the port side. I might use the upper hole but that's not important right now.

Question: I <b>doubt</b> the speaker would interfere with the compass enough to notice but I had to ask if anybody has seen any impact from the other side of the hatch?

I know for all you detail oriented people that there will of course be some impact that maybe only NASA could detect but is it really enough to notice?

Note: The compass probably hasn't been calibrated since her birth (if then).

Scooter
C25 '89 SR/WK #5878 "Square Knot"
Vandemere NC.
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OLarryR
Master Marine Consultant

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USA
3477 Posts
Response Posted - 01/29/2008 :  17:50:56  Show Profile  Visit OLarryR's Homepage
There is a basic way to gain confidence that your installation will be okay without interference and not have to rely on the various comments you may receive that may or may not apply to your specific components and installation.

Just hook up the speaker and experiment with it at various distances from the compass and see if the compass is effected. If no effect, then go ahead with your installation plans.
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Deric
Captain

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USA
408 Posts
Response Posted - 01/29/2008 :  18:45:28  Show Profile
Scooter,

I am very interested in how you fair with your speaker idea. I have a nice round hole where my failed knowmeter once decorated my hull. I have been at a loss for ideas: what I should do with the hole left by the removal of my knotmeter? Seems to be waste to just cover it up.

Your idea of the speaker for the marine radio sounds like a great idea. Let me know what kind of speaker you chose.

I suppose you could read the compass setting before placing the speaker in the vicinity of the compass. Observe the behavior of the compass in absence of a speaker nearby, and then with a speaker nearby.

Keep us informed of your progress with the speaker idea.

Thank you,
Deric
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 01/29/2008 :  20:11:56  Show Profile
Practical Sailor just reviewed remote speakers, some were terrible but several modest priced ones were very good. Unfortunately, I am far from home and don't remember which brands/models they recommended.

Generally If you are three ft away you're good, but the previous advice to try it as a temporary hookup is the best approach. Be sure to test it off, on, and while producing sound.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 01/29/2008 :  20:45:53  Show Profile  Visit Champipple's Homepage
About 10 years ago we left the dock for our first 80 plus miler on Tsunami - knowing there was going to be at least 5 hours of drifting until the offshore breeze kicked in one of the guys on the crew rigged a portable speaker to sit on the deck right by the cabin hatch. (roughly 2 or 2.5 feet from both compasses.)

We had two doctors, 1 MBA, 1 PHD, and 3 regular degrees on board.... It took us until about 8 o'clock when the wind piped up and the speaker went back down below to realize why we were heading 340 and 60 regardless of direction.
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OLarryR
Master Marine Consultant

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USA
3477 Posts
Response Posted - 01/29/2008 :  21:52:36  Show Profile  Visit OLarryR's Homepage
Duane,

Makes for a good story afterwards but at the time...probably was not so funny.

Reminds me of when I was a kid and my cousin took me fishing on a row boat. It was then time to row back in and he was bragging a bit about how good a rower he was having been a sailor and all...then he was complaining how long it was taking for us to get back until we realized we had forgotten to pull up the anchor.
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Scooter
Navigator

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USA
228 Posts
Response Posted - 01/30/2008 :  07:42:49  Show Profile
Thanks for the comments. I hope to do this next week if temperatures allow. I am lucky to have it in a barn (unheated) but still under shelter. I just have to wait until it's warm enough for a few days to let the sealant cure properly.

I may have to safely rig me a space heater????

See next topic about depth sounder.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 01/30/2008 :  08:27:27  Show Profile  Visit Frank Hopper's Homepage
I think most of you are familiar with the inspection ports that get used for a multitude of reasons, fewer of you will be aware that they sell storage bags that fit in the inspection ports to create a storage compartment. I would be tempted to use an inspection port with bag on an old instrument hole.
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 01/30/2008 :  17:49:02  Show Profile
Practical Sailor did an article but only one of the speakers was the flush-mount type. It was the Poly-Planar MA-1000R and they rated it as having Good sound. 6" diameter and $41. It passed the "spray" test as well.
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Gloss
Master Marine Consultant

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USA
1916 Posts
Response Posted - 01/30/2008 :  19:45:13  Show Profile
I am in the process of installing two poly planar speakers in my cockpit. I choose them because of their magnetic shielding, and also water resistance. They claim that with the plastic cones you can even hose them down.
They will be mounted approximately 3 or 4 feet from my binnacle compass, and eventually the flux gate compass on a future wheel pilot.
I sure hope there is no interference.
I believe all the poly planar speakers are shielded magnetically, but not all marine speakers are.
Whether or not you can buy just one, I don't know.
Good luck
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.