I've been convinced to look at the next possible improvement.
Looking at a 12" JL audio subwoofer and appropriate amp.
Last year we replaced the Sony head unit and 6.5' dolphin speakers with a Fusion head unit, 4 6.5" JL speakers, 2 8.8' JL speakers and an 800 watt JL amp. Awesome, massive improvement. And yet...
What size amp do you recommend for a single 12" sub?
I'm going to stay JL due to my satisfaction so far...
I have been really impressed by the bass output of the 8.8" speakers, wondering about the difference in sound with a good sub setup?
Looking for some advice!
Next Stereo upgrade
- Mike in SC
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Re: Next Stereo upgrade
If your going JL... just ask JL customer service ... if you get lousy customer service then ...
I have same boat ....different stereo system ... good customer service
I have same boat ....different stereo system ... good customer service
2004 220
- jhnmdahl
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Re: Next Stereo upgrade
Creativeaudio.net does a great job with this sort of thing too, and gives a discount to Cobaltchat members. James Taylor is the contact there, and knows/carries the JL audio stuff very well. See the thread in the “Member Deals” section for more info.
John
John
Administrator of the www.cobaltchat.com Cobalt boats community forum
2015 210 (Volvo Penta 5.7L V8-225)
2015 210 (Volvo Penta 5.7L V8-225)
Re: Next Stereo upgrade
MHD 750/1 for the win. Or a M1000/1
The JL 12" is a 4 ohm sub, so the M600/1 only puts out 400W at 4 ohm. You need 2 ohm to get the full 600W.
The M1000/1 will put out 600W at 4 ohm
The MHD 750/1 puts out 750W at any ohm rating.
The JL 12" is an infinite baffle sub, which means it doesn't need an enclosure. BUT, it does need to be sealed air tight from the front of the sub to the back if you install it as an infinite baffle. Otherwise you can install it into a large sealed or ported enclosure. JL has box dimensions for both if you decide to go that route.
Mine is a 3 cu ft sealed box.
The JL 12" is a 4 ohm sub, so the M600/1 only puts out 400W at 4 ohm. You need 2 ohm to get the full 600W.
The M1000/1 will put out 600W at 4 ohm
The MHD 750/1 puts out 750W at any ohm rating.
The JL 12" is an infinite baffle sub, which means it doesn't need an enclosure. BUT, it does need to be sealed air tight from the front of the sub to the back if you install it as an infinite baffle. Otherwise you can install it into a large sealed or ported enclosure. JL has box dimensions for both if you decide to go that route.
Mine is a 3 cu ft sealed box.
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- Krob1114
- Vice Admiral

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Re: Next Stereo upgrade
I'll bet my wife could hear the music from her bow seat.
One of the few things that I don't like about our R3 is that people in the bow seating block the front speakers if the lean to the outside.
One of the few things that I don't like about our R3 is that people in the bow seating block the front speakers if the lean to the outside.
2019 Cobalt R3 @ Greers Ferry Lake, AR
Home in Hernando, MS
Home in Hernando, MS
Re: Next Stereo upgrade
Add another set of speakers.Krob1114 wrote: Sat Jun 12, 2021 6:35 am I'll bet my wife could hear the music from her bow seat.
One of the few things that I don't like about our R3 is that people in the bow seating block the front speakers if the lean to the outside.
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- Mike in SC
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Re: Next Stereo upgrade
What company gave you such good service?SAB220 wrote: Fri Jun 11, 2021 9:02 pm If your going JL... just ask JL customer service ... if you get lousy customer service then ...
I have same boat ....different stereo system ... good customer service
Mike in SC
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
- Mike in SC
- Captain

- Posts: 327
- Joined: Sun Jul 14, 2019 9:37 pm
- Location: Lake Murray, SC
- Contact:
Re: Next Stereo upgrade
Do I consider the passenger compartment on the port side a sealed enclosure, or open space?xlint89 wrote: Fri Jun 11, 2021 11:09 pm MHD 750/1 for the win. Or a M1000/1
The JL 12" is a 4 ohm sub, so the M600/1 only puts out 400W at 4 ohm. You need 2 ohm to get the full 600W.
The M1000/1 will put out 600W at 4 ohm
The MHD 750/1 puts out 750W at any ohm rating.
The JL 12" is an infinite baffle sub, which means it doesn't need an enclosure. BUT, it does need to be sealed air tight from the front of the sub to the back if you install it as an infinite baffle. Otherwise you can install it into a large sealed or ported enclosure. JL has box dimensions for both if you decide to go that route.
Mine is a 3 cu ft sealed box.
Mike in SC
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
Lake Murray, SC
2003 Cobalt 220
350 Mag MPI/Merc Bravo 3
Re: Next Stereo upgrade
If it's not air tight, it's not sealed.
You don't need to be sealed air tight for infinite baffle. You don't want the sound wave created on the back of the speaker meeting up with the sound wave created on the front of the speaker as they would cancel each other out and degrade the over all performance.
You don't need to be sealed air tight for infinite baffle. You don't want the sound wave created on the back of the speaker meeting up with the sound wave created on the front of the speaker as they would cancel each other out and degrade the over all performance.
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