Go Back  Offshoreonly.com > Technical > Electronics
Adding more JL to my new boat >

Adding more JL to my new boat

Like Tree2Likes
  • 1 Post By Griff
  • 1 Post By Mbam

Adding more JL to my new boat

Reply

Old 09-25-2018, 06:40 PM
  #1
Registered
Thread Starter
 
Join Date: Aug 2014
Posts: 2
Default Adding more JL to my new boat

I just bought a 2018 Sea Fox 28' center console. From the factory it came with a JL media master 100, a M600/6 powering six 7.7M series speakers, and a M600/1 that powers two M series 10's. Clearly that isn't enough so I bought four M 6.5's and a MHD-900/5 amp to add to the system. I also intend to buy at two additional subs to run on the MHD-900.

I have two questions.

1. Does that MHD-900 have enough power to run 12's or should I stick with another set of 10's or maybe even a set of their new 8's?

2. I know from experience with my last boat that the MHD is a vastly more powerful and cleaner sounding amp than the M600/6. How should I divide up the speaker load? I'm thinking four 7.7's and a set of subs on the more powerful MHD900 since the 7.7's are larger, two 7.7's and four 6.5's on the M600/6, and leave the original set of 10's on the M600/1. Thoughts or suggestions?

Steve

Last edited by ssmith9867; 09-25-2018 at 06:42 PM.
ssmith9867 is offline  
Reply With Quote
Old 09-26-2018, 09:39 PM
  #2
Registered
iTrader: (2)
 
ROB FREEMAN's Avatar
 
Join Date: Sep 2006
Location: Wis
My Boat: 1998 Cigarette Top Gun .. 750 pfaffs . mitcher t paint ,
Posts: 2,119
Default

well ive got a jl1200 digital amp if you need some real sub power , almost brand new sitting on my shelf , got sick of no batteries after hr of pounding stereo ,, now I just enjoy the others stereos . save my electrical system for my ignitions .. sounds like loud mofo .
ROB FREEMAN is offline  
Reply With Quote
Old 09-26-2018, 10:29 PM
  #3
Registered
Thread Starter
 
Join Date: Aug 2014
Posts: 2
Default

I ran two of these MHD900s stacked running ten 6.5s two 7.7s and four 10s in my last boat which had four deep cell batteries set up just like as in my new boat. Pics of my old boat are still on JLs website. I ran it hard at least four hours at the last poker run and had no power issues when it was time to start up and go home. These JL amps sip power compared to the Rockford marine amps I was using before.

Last edited by ssmith9867; 09-26-2018 at 10:32 PM.
ssmith9867 is offline  
Reply With Quote
Old 09-28-2018, 01:26 AM
  #4
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boat: .......32............. ............Active Thunder....
Posts: 16,796
Default

I would just run a single high end 12" or maybe even a 15" sub in sub box off the new amp, and I'd run 4 of the 7.7's off the new amp.
BIGSLOW likes this.
Griff is offline  
Reply With Quote
Old 10-26-2018, 05:43 AM
  #5
Offshoreonly Advertiser
Offshoreonly Advertiser
 
Mbam's Avatar
 
Join Date: Mar 2001
Location: Pompano Beach FL, USA
My Boat: 1972 Cigarette 36 race
Posts: 2,117
Default

Originally Posted by ssmith9867 View Post
I just bought a 2018 Sea Fox 28' center console. From the factory it came with a JL media master 100, a M600/6 powering six 7.7M series speakers, and a M600/1 that powers two M series 10's. Clearly that isn't enough so I bought four M 6.5's and a MHD-900/5 amp to add to the system. I also intend to buy at two additional subs to run on the MHD-900.

I have two questions.

1. Does that MHD-900 have enough power to run 12's or should I stick with another set of 10's or maybe even a set of their new 8's?

2. I know from experience with my last boat that the MHD is a vastly more powerful and cleaner sounding amp than the M600/6. How should I divide up the speaker load? I'm thinking four 7.7's and a set of subs on the more powerful MHD900 since the 7.7's are larger, two 7.7's and four 6.5's on the M600/6, and leave the original set of 10's on the M600/1. Thoughts or suggestions?

Steve
Larger speakers don't require more power. They generally are more efficient and capable of using more power without failing. And all else being equal will produce more volume (db's) especially at lower frequencies. So - me, I would go for the 2 12's. And mount them close together

proAV / data and information, lists, tables and links
Blueabyss likes this.
__________________
Marc

www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's alive -www.BoatStuffExpress.com - additional 10% discount for OSO members
Mbam is offline  
Reply With Quote
Old 10-26-2018, 05:44 AM
  #6
Offshoreonly Advertiser
Offshoreonly Advertiser
 
Mbam's Avatar
 
Join Date: Mar 2001
Location: Pompano Beach FL, USA
My Boat: 1972 Cigarette 36 race
Posts: 2,117
Default

Originally Posted by ssmith9867 View Post
I just bought a 2018 Sea Fox 28' center console. From the factory it came with a JL media master 100, a M600/6 powering six<span style="color:#333333;"> 7.7M series speakers, and a </span>M600/1 that powers two M series 10's. Clearly that isn't enough so I bought four M 6.5's and a MHD-900/5 amp to add to the system. I also intend to buy at two additional subs to run on the MHD-900.<br /><br />I have two questions.<br /><br />1. Does that MHD-900 have enough power to run 12's or should I stick with another set of 10's or maybe even a set of their new 8's?<br /><br />2. I know from experience with my last boat that the MHD is a vastly more powerful and cleaner sounding amp than the M600/6. How should I divide up the speaker load? I'm thinking four 7.7's and a set of subs on the more powerful MHD900 since the 7.7's are larger, two 7.7's and four 6.5's on the M600/6, and leave the original set of 10's on the M600/1. Thoughts or suggestions?<br /><br />Steve

Larger speakers don't require more power. They generally are more efficient and capable of using more power without failing. And all else being equal will produce more volume (db's) especially at lower frequencies. So - me, I would go for the 2 12's. And mount them close together

www.bnoack.com/audio/mutualcoupling.html]proAV data and information, lists, tables and links
__________________
Marc

www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's alive -www.BoatStuffExpress.com - additional 10% discount for OSO members
Mbam is offline  
Reply With Quote
Old 03-08-2019, 12:17 PM
  #7
Registered
 
Join Date: Oct 2010
Location: Cheboygan, MI
My Boat: 1998 Velocity 280
Posts: 952
Default

I have 2 JL Audio 12" subs in boxes on a 500W JL Audio AMP. I can shake the boat apart, I can even create ripples in the water. FWIW.
ThisIsLivin is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser