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Old 27th February 2012, 04:10 AM   #1
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Join Date: Nov 2011
Default Alpair M6 Boat Speakers

I needed new speakers for my boat.

These use the Alpair M6 driver. Challenges on the boat are humidity and space.

I went with some tight grain fir that was laying around the workshop. Planed it to 1" thickness and constructed so that the front, back and sides can all expand and contract without splitting the cabinets apart.

A hint of walnut finished them off.

I can assure you the sound is much better than the nasty little marine speakers they are replacing!
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Old 27th February 2012, 05:39 AM   #2
sayrum is offline sayrum  Germany
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Quote:
Originally Posted by Waterdog View Post
Planed it to 1" thickness and constructed so that the front, back and sides can all expand and contract without splitting the cabinets apart.
great idea, to take the expansion + contraction into acount. how did you build the cabinet to allow for the "movement"?

nice design!

do you hook the drivers straight to your amp or use a correction network/notchfilter... ?

greets,
daniel
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Old 28th February 2012, 03:37 AM   #3
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The top/bottom/sides are a rectangular frame constructed with a box joint. These will increase / decrease slightly with changes in moisture content. The front baffle and back have a small rabbet so they fit inside the frame (not too snugly) and overlay the frame at the front. These can expand and contract considerably, but will not bind with any other components. Four screws go through recessed holes in the back and hold the front on sandwiching the frame in the middle.

Plywood or MDF are much more stable materials for the purpose, but I prefer not to use these materials on the boat.

They will be connected directly to the amplifier.
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Last edited by Waterdog; 28th February 2012 at 03:39 AM.
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Old 28th February 2012, 04:54 AM   #4
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Location: Willamette Valley
Default stability

MDF+moisture=expansion
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