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#1429716 - 07/03/08 09:36 AM

Help with sub install!

M&M's
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Registered: 07/03/08
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I recently installed 6 JBL 6.5" speakers in my 21' Sea Pro Center Console. 4 of which were running off the Sony CDX-HS70MW head unit. The other 2 are running off a Sony XM-604M amp. This amp is set up to be either 4 or 3 channel. I bought this amp so I could run the 2 speakers on 2 of the channels and then bridge the other 2 channels for a sub install. This is what this amp is intended for. I am now finally getting around to installing a JL M10iB5-4 10" free air sub on the side of the center console about a foot above the deck of the boat. The problem is this expensive JL sub does not sound loud at all. My 6.5"s are putting out as much bass. The amp is rated at 140 watts RMS at 4 ohms. I would think this would be enough power to at least make the sub sound decent.

Should I install a box around this free air sub? Does the amp just suck? Any help would be great.

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#1433015 - 07/08/08 02:25 PM

Re: Help with sub install! [Re: M&M's]

OhioMike1101
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Registered: 03/28/02
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build a box

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#1433032 - 07/08/08 02:52 PM

Re: Help with sub install! [Re: OhioMike1101]

SuperJay
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if it's designed for free air it already has a high Q. if you put it in a box this will only raise the Q higher, making it 'boomy' and empty sounding. I'm not sure 140 watts is enough to power that sub. check to make sure that you aren't getting back wave cancellation. make sure that the rear is sealed off from the front by at least 9 feet (so that the wave has to travel 9 feet to see the front)

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#1442051 - 07/18/08 10:26 PM

Re: Help with sub install! [Re: SuperJay]

keep_hope_alive
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Originally Posted By: SuperJay

check to make sure that you aren't getting back wave cancellation. make sure that the rear is sealed off from the front by at least 9 feet (so that the wave has to travel 9 feet to see the front)

excellent advice. the console still needs to be "sealed" for it to work. bass on a boat is difficult since it's an open space. put a sub box in the middle of your yard and you get poor response around it. IMO you can't really get "free air" with a sub on a boat - there is always an enclosure and it's typically a poor one (i.e. console). i would find a better place for that sub - maybe use the storage space under a seat as the "enclosure". if it is large enough it will act "free air"

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