Marine Electronics Forum - Question for you Audio installers

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View Full Version : Question for you Audio installers


shotnbeer
03-23-2012, 11:13 AM
This is what I have-
1. MHD 900/5 JL amp
2. 2 6.5 mx JL speakers
3. 2 7.7 m JL speakers
4. 2 M10 JL subs
5 Sony 900 series stereo
This is being installed in a 33 Bertram SF 1981
Going to put the 6.5 up in the bridge. The 7.7 and 10" subs on the side panels under the overhang above the engine boxes in the cockpit. The stereo is in the bridge electronics box so figureing 12ft RCA cables from the electronics box down to the inside of the bridge console and mount it in there. Run the power and ground up to the console direct from the battery. Install 60 amp fuse 2ft from positive hook-up at the battery. Can I use standard tinned wire for speakers or is there speaker wire specially made for marine? Does anyone have anything to add as far as knowing of an install like this or heard it? Any imput would be welcome. Going to install with-in the next couple of weeks. Thanks


AlexCT
03-23-2012, 11:15 AM
you want to use marine grade wire. not regular home stuff.

shotnbeer
03-23-2012, 11:22 AM
you want to use marine grade wire. not regular home stuff.

I figured that. The plan was to use multi strand 12g tinned wire [marine] to hook up the speakers. Was wondering if there was special MARINE SPEAKER wire that needed to be used like you would use in hooking up a house or car stereo. Thanks


No Promises
03-23-2012, 11:32 AM
Make sure you parallel wire the 4 ohm subs to send a 2 ohm load the the sub channel - - I dont know how many times I have seen people wire them in series (8 ohm load) & cuts your RMS power in half.

DirtBusters
03-23-2012, 11:32 AM
No, no special speaker wire and quite honestly, on a boat like that, you could even pass on the tinned copper wire. I did an install several years ago on a 48 viking with non tinned wire and there is no corrosion to be seen.

Glen E
03-23-2012, 11:40 AM
16-2 shielded...easy to run......

AlexCT
03-23-2012, 11:40 AM
marine wire is tinned. your wire might be satisfactory. My feeling is that if your running all this wire and you turn out to be wrong just to save a few bucks on wire, re wiring will be a PITA

wstrickland1
03-23-2012, 12:00 PM
Make sure you parallel wire the 4 ohm subs to send a 2 ohm load the the sub channel - - I dont know how many times I have seen people wire them in series (8 ohm load) & cuts your RMS power in half.


In that situation wouldn't you want to cut the power in half? Those subs are rated for 250 watts. There is even a graphic from JL that shows that anything over 250 watts will void the warranty. I have the same amp w/ one sub so I cut down the gain. I need another sub I guess.

DirtBusters
03-25-2012, 01:01 PM
In that situation wouldn't you want to cut the power in half? Those subs are rated for 250 watts. There is even a graphic from JL that shows that anything over 250 watts will void the warranty. I have the same amp w/ one sub so I cut down the gain. I need another sub I guess.

Cutting down the gain doesnt cut down the power. Just as turning up the gain doesnt increase the power. Yeah, it may make it louder, but the gain side of amplifiers is used to match the output of the headunit to the input of the amplifier. Lower voltage pre outs, higher gain, high voltage preouts, lower the gain.

DirtBusters
03-25-2012, 01:03 PM
marine wire is tinned. your wire might be satisfactory. My feeling is that if your running all this wire and you turn out to be wrong just to save a few bucks on wire, re wiring will be a PITA
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I have car audio wire that is tinned. Does that make it marine wire? Copper wire is copper wire. The tinned copper MAY reduce corrosion a little more than non tinned, but many times the cost outweighs the risk.

bradv
03-25-2012, 01:09 PM
I use 14 gauge for the speakers and 12 gauge for the subs. Just run both subs back to the amp and plug them both into the sub output it will run them at 2 ohms which the amp can handle and still is 500 watts.



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