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Thread: Subwoofer under your feet?
03-18-2010, 10:34 AM #1
Subwoofer under your feet?
Why does everybody's design put the subwoofer right in front of the driver's feet? I think that would drive me nuts. I also think I might put my wet foot right into it. Is there some acoustic reason to locate it there? Or, is it just that there is no place else? On my Outback I put a subwoofer up high on the wall behind the observer's seat where it would stay dry (rollers over the bow every now and then, you know). It seemed to turn that whole area into a booming cavity. It really rocked the boat. I'd appreciate anyone's thougths on this.My Mom said I'm not allowed to get wet!
2000 Outback LS (sold)
03-18-2010, 11:05 AM #2
My take on this from experience and such. Many put it there because the physical size of their setup won't fit anywhere else. Their setup may use a ported design that requires a large box and that's the only feasible place like Newty's. Others put it there for the ease of installation and it looks nice. Some people put it there for the visual effect, ya know the "hey look at my cool sub!".
On the flip side you can't even see mine, it's in a box bolted to the top of the footrest, facing the hull. It creates a surround sound type effect that actually travels around the compartments. For mine to get wet the boat would be swamped!2007 Mobius LSV
03-18-2010, 11:06 AM #3
I think it boils down to placing it where it won't eat up valuable storage space.
looking at where I mounted mine, the choices were under the helm at drivers feet, under the observers storage compartment, but that's full of lifejackets, towels and the docking ropes/buoys, not to mention the factory location of the amps, or in one of the rear storage compartments, and we know what goes back there
I've seen a few installs under the obervers storage area, and to me, that space is way to valuable to give up for a sub box, and the space under the helm is just wasted.'06 Supra Launch 20SSV-gone but never forgotten
03-18-2010, 11:45 AM #4
Space is the #1 reason. accoustically its not the best spot. I actually made mine a sealed enclosure and faced the sub forward about 3" from the back of my cut out. It sounds waaaaay better. I left the grill the way it was so it looks like the sub is still there. Subs need something to reverberate off of. Fireing at your feet isn't the best use of a sub. Unless its ported and the port faces the hull, but in the case of the LSV there isn't enough room to have a ported enclosure w/o some serious mods, or a sub that wants a very small box.
Razz's idea is the best provided the box and sub are small enough to fit. If you don't have a heater, that gives you a few more choices too for putting the sub in front of the hump.
PWI as usual...
03-18-2010, 01:32 PM #5
Acoustically it is about the center of the boat; not too bad a place most of the time. The other reason is kinda obvious; that is where it fits, easily. If you look at the OD of your grill, and start crawling around on the boat measuring, you wil lnot find a lot o places with the real estate to put a woofer...
03-18-2010, 04:44 PM #6
Pertaining to Moomba subwoofer locations heres a few considerations from an acoustic perspective.
A select few Moombas, some Outbacks for example, may not have a hump under the driver's helm console. In this case its a no brainer to place the sub under the dash. There's lots of room for a variety of subs and you can fit in a bass-reflex enclosure which is 50 percent larger but has decidedly more output. You only have to elevate the sub off the sole in how you mount the enclosure to provide drainage and avoid a moisture trap. A true marine-grade enclosure will last indefinitely and resist the occasional roller over the bow once elevated.
Most Moombas do have a hump under the dash. And, Moombas do not have as much vertical room under the dash as do Supras, for instance. And, in the last several year models this space over the hump has gotten a little tighter. So tight, in fact, that you may need to slightly relocate the fuse panel to fit in a side-firing 10-inch sealed subwoofer enclosure. Mounting bracketry for this is a little tricky but you've got enough internal displacement of .6 cu. ft. net to facilitate some very good 10-inch woofers. This location is your best shot for a musical, articulate subwoofer with good transient response and tonal construction. Its totally concealed and with the addition of a carpeted facade it will completely disappear.
Many people cut up the hump to fit something bigger in. Personally, I'm not a fan of that and also I don't like stealing away any of the leg/foot room.
The only reason to go over to the port locker and sacrifice the valuable storage space is if you want a larger subwoofer, like a 12-inch, and perhaps in a larger bass-reflex enclosure. This is a solidly-built compartment and when the observer seat is closed it will substantially alter the woofer's performance. Will it boom and rumble and hit from within the closed comparment? Sure. But , you've created more of a boat-shaker than a bass-maker and both the woofer and amplifier are going to be taxed to overcome the chocking effect of the enclosed locker. And, you can say goodbye to many of the more musical aspects of the bass, although not everyone is going to be that discerning. You can, to a great degree, remedy this by installing a vent to allow the bass radiation to freely pass. Optimumly, the vent should have a pass-through surface area equal to the collective subwoofer and bass reflex port.
Another option is to use a true marine free-air 10-inch subwoofer in the face of the hump in front of the driver's feet. The sub will utilize the bilge as its enclosure. Optimumly a free-air sub would like to have 3 cubic feet to infinity of unobstructed enclosure displacement. However, the baffle must be isolated front-to-rear. Its important to seal up the top of the hump where the cables enter/exit. Any penetrations on the opposite or port side are too remote of a pathlength to have any impact so only worry about those in near proximity to the woofer. Also, many of the humps have a very thin fiberglass construction. Its not a bad idea to overlay another panel clad in matching carpet to add rigidity to this surface.
03-18-2010, 05:43 PM #7
^^^Everybody got that right?
03-18-2010, 07:44 PM #8
The Search For Bass Continues....
As things apply in the tournament boat world I see locations as 1 of two options:
1 - you make the best of your under helm area or,
2 - you use up your valuable cubby space.
I think ultimately, in the real world people opt to use their foot area in lieu of giving up storage space. It does make sense to some degree.
And I alsothink some people go over board. I've got people trying to stuff 15's into area that is incredibly tight! This ends up yielding VERY little foot space.
It seems like the same questions keep coming up over and over again about what size woofer, the trade offs between 10's and 12's. Free air and vented or sealed etc. And then of course what type of materials to use for an enclosure.
To tease the group a little bit.... I'll share this.
We put our minds together about 3 months ago and designed a bass SOLUTION for the Moomba crowd. This will be an Exile enclosure engineered for Moomba's LSV helm that offers 1.7cu's , venting from the top to boundary load into the helm area, a forward facing woofer to satisfy the bling of boat owners, all built from reinforced duramax expanded pvc plastic's and some radical glue technology.... The enclosure will even have a kick plate system to lift it off the ground to stop any potential moisture build up.
Since this product is in development, I dont want to get into selfish brand promotion pricing crap.... My point is to just share with you guys the direction we are heading and why, as it applies to the Ops question.
If you'd like visuals on this , PM me. I'm not really sure how to post it up
ps: this system will work with our woofer or most other 12's on the market
03-18-2010, 09:18 PM #9
So what you are saying is that the mouth of the port will exit up into the helm cavity while the woofer will be direct radiating and aimed out toward the driver?
Will you have to cut out the hump?
Is it 1.7 cu. ft. net displacement with or without the volume of the port?
03-18-2010, 09:50 PM #10
I have 2 Kicker L7's in my boat; one behind the spotters seat in the stoarage compartment, and one under the drivers dash. It doesn't much interfere with my leg room, and it fit perfectly in there. I did it because it was easy, and sounds great.BoatBling Moomba forum member discount thread
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