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Old 01-25-2014, 05:15 PM
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Traxx822 Traxx822 is offline
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Adding a subwoofer

Hello guys,

I am looking to add an extra subwoofer to my set up. I already have one in the walk through, the next one will likely be in a box at the drivers seat.

Both subs are JL10IB5 @ 4 ohms

Currently I run my existing single subwoofer with a M700/5. The same amp powers my cockpit M770's. The amp is 100W x 4 +300W.

My dealer recommends I buy a M600/1 and just drop using the 5th channel on the 700. But I would like to not have 3 amps in there. I also have the M400/4 for the tower speakers.

I think that IF i can sell both of my current amps. and then buy a M800/8 and the M600/1 and have a perfectly balanced set up. 100Wx8 @ 2ohms on one amp and Split the 600 single between the two subs. For about $300-$400. 2 amps out and 2 amps in. Instead of 3 goofy amps I don't know where to fit.

Your $0.02?

Is my idea the better alternative than the dealers?
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Old 01-25-2014, 06:50 PM
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Aric'sX15 Aric'sX15 is online now
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Wait are you putting an IB sub in a box?
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Old 01-25-2014, 07:11 PM
supreme112279 supreme112279 is offline
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I did 3 amps. One is 4 channel with a 5th for sub only. 2nd it tower speakers. Third is for subs in my engine compartment. I mounted them. One back wall in storage at copilot seat. 2nd right wall where you mounted your sub. Third under copilot seat. No issues after 3 years
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Old 01-25-2014, 07:13 PM
supreme112279 supreme112279 is offline
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The only thing with your idea I don't like is running amps at 2 ohms. Georgia heat tends to make them cut out
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Old 01-25-2014, 07:47 PM
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I would like to see pics of the sub placements in the engine compartment....intriguing...if possible...
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Old 01-25-2014, 07:49 PM
supreme112279 supreme112279 is offline
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Can not get pics for at least another week. One far back left and far back right facing forward. There's a lot of room back there in a maristar
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Old 01-25-2014, 07:51 PM
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Tristarboarder Tristarboarder is offline
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No prob, if I read that correctly you have 4 subs in the boat? I bet that thing is loud
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Old 01-25-2014, 08:21 PM
supreme112279 supreme112279 is offline
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3 ....12s. Third is at my drivers feet. 144 decibels
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Old 01-26-2014, 09:20 AM
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Here is a pic of my mounting.

With JL amps you have to run 2 ohm to get the right amount of amps out of the cockpit speakers. If I run in 4 ohms I get about half. I have had no trouble with my current system.

I', also pretty sure I mentioned that both subs were 4ohm subs and would be run as such. Where my current set up only runs one 4 ohm sub at 2 ohms.

Yes I will be putting the IB in an enclosure. I know it sounds funny but it has to go somewhere. I havent decided on dimensions or ported etc but I can figure this out.

I as well would like to see your subs installed in the engine compartment. It might make me change my placement setup.

As well, does anyone else think its a bad idea to do away with the 700 & 400 and change to the 800 & 600?
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Last edited by Traxx822; 01-26-2014 at 09:38 AM.
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Old 01-26-2014, 02:04 PM
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A few sound system basics to follow would be....
*Do not place an IB (infinite baffle) woofer in a small sealed enclosure, although a 10-inch IB does view a sealed enclosure of 2.25 cu.ft. or larger as infinite, but that is a very large box. JL Audio also makes the identical marine 10-inch subwoofer in a W-series, which is an air/acoustic suspension woofer intended for a small box (best results are a 1.0 cu.ft. box).
*Never under any circumstances use a high 'Q' IB woofer in a bass-reflex/ported application. Bass-reflex specifically requires a lower 'Q' woofer.
*Do not place a fullrange coaxial and IB sub side-by-side, in close proximity, in the same cavity without some form of isolation chamber. The smaller fullrange speaker becomes a sympathetic radiator for the dominant sub = nasty modulation distortion.
*If you want any degree of bass tonal contruction (pitch accuracy, sound quality, etc.) then use all identical subs, all tightly collected in the same location, loaded in the same form of enclosure (whether I.B., A.S., or Bass-reflex), oriented the same, and loaded into the boat the same. Otherwise you have created phase soup. Will you still get more bass output as you indiscrimanently add more woofers and power? Sure. But never with the SQ and efficiency as the initial and best positioned sub.
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