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fg sub enclosure in a boat


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elmatth1 
Member - Posts: 4
Member spacespace
Joined: June 17, 2007
Location: United States
Posted: June 17, 2007 at 11:16 AM / IP Logged  
I recently decided to add a 12" sub and some 6 1/2 full range speakers to my 1995 18' SeaRay bowrunner boat.  I decided to put the sub in the fiberglass floor under the dash as the floor angles upward under the dash at about a 45 degree angle approximately 16 inches.   So I cut the mounting hole for my sub and removed as much of the foam under the fiberglass as was practical, leaving me with about 1 cubic foot enclosure.  Here's where the problem is.  In this area is a fiberglass brace that sticks up into the enclosure leaving me about 2-3 inches shallow on mounting depth.  I am going to build the enclosure outward  with fiberglass to give me more volume and mounting depth.  So, I was wondering if I would need to enlarge the original hole cut out of the fiberglass to make one large enclosure, or would I be alright just building up from there and leaving the 11" hole as is and kind of have two smaller enclosures joined by the original mounting hole, if that makes sense. 
Velocity Motors 
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Joined: March 08, 2002
Location: Manitoba, Canada
Posted: June 18, 2007 at 8:47 AM / IP Logged  
Why don't you just make the enclosure smaller and add some Dacrom filler ( this fools the sub into thinking the enclosure is actually larger ).
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
elmatth1 
Member - Posts: 4
Member spacespace
Joined: June 17, 2007
Location: United States
Posted: June 18, 2007 at 12:19 PM / IP Logged  
I would do that, but unfortunately, there is a fiberglass brace running down the middle of the hollowed out enclosure that is putting the mounting depth for my sub about 2-3 inches too shallow. 
Installer_mss 
Copper - Posts: 221
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Joined: February 14, 2005
Location: United States
Posted: June 21, 2007 at 5:24 PM / IP Logged  

cut a ring a little larger than the hole you cut in the boat and then cut one the size of the wooferand bevel the edges in the same direction then add some bondoglass to make a smooth, tapered "spacer ring"  then screw it to the boat floor then the woofer to the ring.

"If a man made it, another can modify it...it just takes some thinking."
"If you ask questions, you're a fool for 5 minutes; if you don't, you're a fool for a lifetime."

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