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8" Sub with JL M770s

Old 11-07-2016, 08:28 AM
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Default 8" Sub with JL M770s

My current plan is to install a pair of JL Audio M770s in my center console. In order to narrow down which amp to go with, I'm trying to decide whether or not I should plan to add a subwoofer to the setup. Given my space limitations, I'm probably limited to one 8" sub (considering the JL M8IB5).

Can anyone with a similar setup speak to how worthwhile an 8" infinite baffle sub would be when paired with a set of M770s?

I was thinking of going with the JL M600/6 amplifier to run the two M770s and single M8IB5, which will allow some room to add another pair of speakers (maybe M650s) in the future. In the meantime, the M600/6 would have a surplus of power to run the M770s bridged.

Any input from others with similar setups is greatly appreciated.
Old 11-07-2016, 08:41 AM
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Depends on your goal for Bass. If you want boat shaking bass, you won't be happy without the sub. If you just want your music to sound full and have some low-end. Well-powered M770's without a sub would do the job; or, if you haven't purchased the M770's yet, step-up to the M880's for a little bit better low-end.
Old 11-07-2016, 08:44 AM
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Do you have room for 880s?
Old 11-07-2016, 09:00 AM
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No, I don't think I can get the 880s to fit in the console without tearing into the space around my fuse panel.
Old 11-07-2016, 12:49 PM
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An M600/6 bridged into three channels will run the heck out of two M770s and a single IB8 trio.
Even though there isn't a major gain in surface area from a pair of 770s to a single 8", subs are constructed differently from a full-range speaker. So normally you would see an improvement in the low bass extension among other benefits. The real question is the location of the 8" subwoofer and if the location warrants the subwoofer addition.
Old 11-09-2016, 06:03 AM
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As for subwoofer location, the only spot I've identified is where the existing access hole is on the stern side of the rodbox (see picture).

Any thoughts as to the effectiveness of an 8" sub in this location with the M770s?

(There isn't a similar rodbox on the starboard side of the boat, so I can't put another one in the same spot on the other side.)
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Old 11-09-2016, 07:58 AM
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What are the measurements? Looks like a ten would fit.
Old 11-09-2016, 09:10 PM
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Originally Posted by Dockholiday74 View Post
What are the measurements? Looks like a ten would fit.
^ this.
Old 11-10-2016, 01:10 PM
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If you are going through the hassle of adding a subwoofer, try to squeeze a 10" somewhere. It will play lower than the mids/highs of the 7/7's
Old 11-10-2016, 04:11 PM
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Originally Posted by Dockholiday74 View Post
What are the measurements? Looks like a ten would fit.
I agree. We have open box JL stuff if you are interested.

Mike
Old 11-11-2016, 10:32 PM
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I started out with 6 770s and it wasn't enough bass for me. Added JL 10 forward facing under the console. Super pleased with it now.
Brandon
Old 11-14-2016, 05:55 AM
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I had that same boat I went with a bazooka tube in the console it provided great bass.
Old 11-16-2016, 08:58 AM
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So I think I'm going to shy away from adding a sub for now. For the record I confirmed that an M10IB5 would not fit in that location due to the depth.

Instead, I'm looking at going with one of the following setups:
  1. M770s in console, MHX280/4 (bridged)
  2. M770s in console, MX650s in bow, M600/6 (bridged for 4ch mode)
  3. M770s in console, M770s in bow, MHD600/4

Now it's down to how much $$$ I want to dump into this...


By the way, Odin over at Earmark has been extremely knowledgeable and helpful with laying out the pros and cons of different options. I highly recommend contacting him if you're in the market for marine audio equipment.
Old 11-16-2016, 09:18 AM
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Originally Posted by Wh0__Dat View Post
By the way, Odin over at Earmark has been extremely knowledgeable and helpful with laying out the pros and cons of different options. I highly recommend contacting him if you're in the market for marine audio equipment.
Agreed! Odin is a pleasure to work with and has some of the best prices!
Old 11-16-2016, 10:23 AM
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Originally Posted by Wh0__Dat View Post
So I think I'm going to shy away from adding a sub for now. For the record I confirmed that an M10IB5 would not fit in that location due to the depth.

Instead, I'm looking at going with one of the following setups:
  1. M770s in console, MHX280/4 (bridged)
  2. M770s in console, MX650s in bow, M600/6 (bridged for 4ch mode)
  3. M770s in console, M770s in bow, MHD600/4

Now it's down to how much $$$ I want to dump into this...


By the way, Odin over at Earmark has been extremely knowledgeable and helpful with laying out the pros and cons of different options. I highly recommend contacting him if you're in the market for marine audio equipment.

All of those are great options. I think you will be happy whichever you choose. Like you said, it really boils down to how much money you want to invest. Don't underestimate the MHX280/4. I run it in a home-made cooler stereo and it does some serious work!
Old 11-16-2016, 12:38 PM
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Originally Posted by Wh0__Dat View Post
So I think I'm going to shy away from adding a sub for now. For the record I confirmed that an M10IB5 would not fit in that location due to the depth.

Instead, I'm looking at going with one of the following setups:
  1. M770s in console, MHX280/4 (bridged)
  2. M770s in console, MX650s in bow, M600/6 (bridged for 4ch mode)
  3. M770s in console, M770s in bow, MHD600/4

Now it's down to how much $$$ I want to dump into this...


By the way, Odin over at Earmark has been extremely knowledgeable and helpful with laying out the pros and cons of different options. I highly recommend contacting him if you're in the market for marine audio equipment.
Agreed, there's no doubt Odin's knowledge is on another plateau, especially when it comes time for set-up and tuning.
Old 11-17-2016, 07:32 AM
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I am running 2 of the 7's and 2 of the 8's on an m600 amp. Sound is awesome. However, I am going to add the 10. I am pretty sure I can squeeze it in the storage area at the front of the boat. Hopefully I can squeeze it on my amp? The 7's are located just before the rod storage in that small area and the 8's are located in the center console a few inches in front of the rod holders. Where is earmark?
Old 11-17-2016, 08:08 AM
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Originally Posted by k9cop View Post
I am running 2 of the 7's and 2 of the 8's on an m600 amp. Sound is awesome. However, I am going to add the 10. I am pretty sure I can squeeze it in the storage area at the front of the boat. Hopefully I can squeeze it on my amp? The 7's are located just before the rod storage in that small area and the 8's are located in the center console a few inches in front of the rod holders. Where is earmark?
I assume you have the M880s running bridged off channels 1-4 (200W x 2) and the M770s running off channels 5-6 (75W x 2). Adding the sub on that amp would require unbridging the 880s, which I don't think anyone will recommend. That would result in only 75W to each M880.

Maybe you could put the sub on channels 5-6 (200W x 1) and get another small amp just to run the M770s. I looked at the MHX280/4 which is pretty cheap and puts out 140W x 2 bridged. This would probably be a more appropriate power to be sending to the M770s than the current 75W.

Give Odin a shout (sales@earmarkcaraudio.com). He'll point you in the right direction.
Old 11-17-2016, 08:08 AM
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Let us know what you decide to go with. I plan on adding speakers and amp myself.I think I'm going to swap out the mx650's I have now for m770's and adding another pr of 770's near the bow.Plus amp .Holding off on sub aswell.Had placed a call to earmark and waiting call back
Old 11-17-2016, 09:26 AM
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Originally Posted by Wh0__Dat View Post
I assume you have the M880s running bridged off channels 1-4 (200W x 2) and the M770s running off channels 5-6 (75W x 2). Adding the sub on that amp would require unbridging the 880s, which I don't think anyone will recommend. That would result in only 75W to each M880.

Maybe you could put the sub on channels 5-6 (200W x 1) and get another small amp just to run the M770s. I looked at the MHX280/4 which is pretty cheap and puts out 140W x 2 bridged. This would probably be a more appropriate power to be sending to the M770s than the current 75W.

Give Odin a shout (sales@earmarkcaraudio.com). He'll point you in the right direction.
Awesome !! thanks I am an idiot when it comes to this stereo crap I appreciate the help.!!! OK i actually just looked at it I am running the 8's off ch 3,4 and 5 and 6 and the 7's on 1 and 2. they are all bridged from what I can see. Sorry I bought the boat with this set up.

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