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arosmarin 07-31-2013 09:56 AM

JL MHD600/4 and 4 M770s vs. M600/6 and 6 MX770s
2 Attachment(s)
I'm comparing two different options for my Cobia 237. I just got back from running to the Bahamas, and the stock system, Sony Headunit and two pairs of Sony 6.5 speakers, was difficult to hear while underway. I'm also looking for a little bit more bass, but don't want to add subs at this point. Here's what I'm considering, please let me know your thoughts.

Option 1: $1,130
JL Audio MHD600/4 and 2 pairs of M770's. The speakers would go in the factory mounting positions as indicated below. With the current 6.5's I lose sound in the cockpit and it was hard to hear at the console while underway. But maybe the extra power will help alleviate this?

Attachment 956823

Option 2: $1,070
JL Audio M600/6 and 3 pairs of MX770's. I would use the factory mounting positions and add one more under the rear gunnels (if there is enough depth). I think that this would give me even sound throughout the boat and may be easier to hear while underway. But I don't know what I would be giving up in quality/bass by going down to the MX series.

Attachment 956824

What would you do? Any help would be appreciated. Thanks.

bradv 07-31-2013 11:01 AM

y not 8.8s if youre doing a 600/4

arosmarin 07-31-2013 11:10 AM

I did think about the 8.8's, but they drive the total cost of materials up by about $400 to $1,548 total. I'm trying to stay as close to $1100 as possible. Also, the mid-ship location doesn't have enough diameter space available to fit the 8.8's, and I'm not sure if I have the mounting depth in the bow placements.

Mounting Depth
M770 3.15"
M880 5.18"

Any other suggestions of combinations around the $1100 mark?

Glen E 07-31-2013 12:45 PM

Never buy cheap crap so you can have "more" now - buy the good stuff and save for the 3rd only buy once....patience = quality in the long run....

SpookJr 07-31-2013 01:23 PM

How are you coming up with $1,130 for option #1? Your link suggest it should be $1,700+. Obviously amazon and ebay will be cheaper but not $1,100ish...

arosmarin 07-31-2013 01:32 PM


Your looking at MSRP from the JL Audio site. I only posted those links in case someone wanted to reference the power output of the amps and power handling of the speakers. The prices that I quoted are cobbled together from various websites that I've found.


Maybe I'll look at extending the budget and doing 1 M880 (if I can get it to fit) and two M770s or M650s. Do you think I could run two M770s off one channel on the MHD600/4? It would give each speaker 75 Continuous RMS and they are rated for 100. Or would I be better splitting the channel with two M650s that are rated for 75 RMS?

bradv 07-31-2013 04:50 PM

Why not do a 700/5 with 4 7s and a sub. The bass is going to make the biggest difference

OtisMyMan 07-31-2013 05:55 PM

The MX speakers and those amps are far from cheap crap. I had a set up like pic #1 and with my enclosure with wings employed it was a little hard to hear. I would definitely go with the 6 speaker option for better coverage. You'll also extend the life of your amp and speakers bc they wont have to work as hard. And the MX speakers sound awesome.

arosmarin 07-31-2013 06:05 PM


The main problem is that it's tough to hear from the wheel and the stern of the boat while underway. I feel like adding the stern pair of speakers would alleviate this. I now think I'm leaning towards a M600/6 (75 watts x 6 ch @ 4 ohms on 14.4 volts) and three pairs of M770s. Will that amp give the speakers enough power? They recommend anywhere from 40-175 watts.

bradv 07-31-2013 07:23 PM

Yeah it'll make noise. What about the 800/8 and bridge 7 and 8 for a sub and do ur 6 speakers

arosmarin 08-15-2013 01:08 PM

6 Attachment(s)
I decided to go with the M600/4 and 2 pairs of M770s. Still dialing in the amp and EQ, but the system is very clear and loud. Since I don't have a sub, I turned the High Pass / Low Pass filter off. Is this the normal protocol? The speakers do have a lot of bass for their size, but I accidently bottomed them out a few times during my set up, while playing some music with a lot of bass and messing with the gain and EQ. So I do see the benefit in having subs as BradV mentioned, they would round out the sound and put less stress on the coaxials. Maybe in the future I'll add them, but I'm happy for now as it is a major improvement over the stock Sony's and will be easily heard while running offshore.

Here are some pics of the install done by R.J. Marine:

Amp in the console, with connections hidden underneath the vinyl access panel to the electronics. Had it mounted on 1/4 spacers to allow the amp better cooling.

Attachment 955430

Attachment 955431

Attachment 955432

Attachment 955433

Attachment 955434

Attachment 955435

Thanks for the help guys!

Pipo6007 08-15-2013 01:33 PM

Looks good....If you can, try and mount the 3rd pair on the transom facing forward when you get them. Do you have any pictures of the transom?

Also if the subs can fit under the speakers next to the helm I would place them there facing the driver.

I have 3 pairs of M770's with a M600/6 amp and two 10 inch JL subs with a M600/1 and it sounds great.

stiletto 08-15-2013 02:30 PM

There is a guy over on the MBC forum trying to find a spot for a sub. I don't think there are many good locations in this boat for a sub. Getting audio while running is difficult due to all the wind and engine noise. You need speakers mounted almost like head phones. So adding your third pair further back, probably won't help much while running, and I am not sure where you are planning on mounting them, but that is where the rod holders are and there is not much in the way of mounting depth there. I do not recall how much space there is over the rod holders. I think just having good speakers with good power is your best bet and you got that. Additionally, I would set the low pass/high pass to 45Hz high pass. Your speakers can't reproduce 45Hz and below worth a darn. You are going to make your speakers work easier, and your amp work easier by removing the frequencies that your speakers can't reproduce anyways.

arosmarin 08-15-2013 03:24 PM

Thanks for the input Stilleto. That guy over on the MBC forum is me! Ha! I couldn't find a good spot for the sub, so I just went with the coaxials. We'll see how it goes.

As far as the amp, the lowest it can filter is 50 hz. I'll give it a go and see what happens. Thanks again!

TooReel 08-15-2013 04:00 PM

I think you did good. I like fewer speakers and more power. Too many speakers can cause major phase cancilations and do more harm than good.

bradv 08-15-2013 04:09 PM

Set the crossover at 60 or 65 for the 7s depending how u like how it sounds.does it have 12 or 24 5b seTting? Put that at 24 if it does. No room on the back or sides of the console?

stiletto 08-15-2013 06:38 PM

Bradv - I have the same boat, it is a most excellent boat with storage everywhere. The problem is, there is storage everywhere! No great places for a sub. When you mounted the speakers on the sides of the boat, did you notice if there was enough depth for a subwoofer?

arosmarin 08-16-2013 08:01 AM

I might have been able to fit subs under the mid ship speakers. But they would be in the way of the under gunnel rod holders, which I do use 50% of the time for rods/spear shafts. So this isn't an option for me.

I'm going to measure the bow speaker placements again to see if I could put the subs in these locations and move the coaxials up to the gunwhales. But I don't think that I have the depth, as I measured before to see if I could fit the 880s and ran into a problem with the fish boxes located under the forward seating.

We'll see what happens.

stiletto 08-16-2013 09:48 AM

What about low under the midship speakers? The rod holders do not go low.

bradv 08-16-2013 10:14 AM

anchor locker? sides of console? by ur knees on the console. behind your knees in the leaning post?

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