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JL audio M770 installation

Old 06-01-2016, 06:51 AM
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Default JL audio M770 installation

I have purchased 2 new pairs of m770 speakers to replace an older set of mx770.

The issue is the front set of speakers have to be "wedged in" to the front side of the console because the ttop aluminum is in the way.

The 4 screw installation was ok for the mx770, but the m770 have 6 screws. No matter how I rotate the speaker, it is impossible to drill a hole for the front 2 screw locations. I tried to drill from the inside of the console but there is a baitwell in the way.

is it ok to mount with 4 screws? (which I already did). Should I wedge something or seal the front installation of the speaker to where it touches the fiberglass? im afraid salt spray will get in to easy and I cant imagine that is good for the back of the speaker. Also will this affect the sound because it is not sealed 360 degrees? Or just leave it as is?

Thanks in advance!
Old 06-01-2016, 07:25 AM
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Originally Posted by sterik530 View Post
I have purchased 2 new pairs of m770 speakers to replace an older set of mx770.

The issue is the front set of speakers have to be "wedged in" to the front side of the console because the ttop aluminum is in the way.

The 4 screw installation was ok for the mx770, but the m770 have 6 screws. No matter how I rotate the speaker, it is impossible to drill a hole for the front 2 screw locations. I tried to drill from the inside of the console but there is a baitwell in the way.

is it ok to mount with 4 screws? (which I already did). Should I wedge something or seal the front installation of the speaker to where it touches the fiberglass? im afraid salt spray will get in to easy and I cant imagine that is good for the back of the speaker. Also will this affect the sound because it is not sealed 360 degrees? Or just leave it as is?

Thanks in advance!
How much power are you putting to them?
Can you get a hand to the back?
One thing I have done is use a stainless bolt and nut with a small washer on back. Four of those will be plenty.
If that's not possible you could go up one screw size for better bite.
You could add small starboard squares to the back of screws to also help bite
You can also caulk any gaps but sound will be ok.
Old 06-01-2016, 08:32 AM
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Originally Posted by Dockholiday74 View Post
How much power are you putting to them?
Can you get a hand to the back?
One thing I have done is use a stainless bolt and nut with a small washer on back. Four of those will be plenty.
If that's not possible you could go up one screw size for better bite.
You could add small starboard squares to the back of screws to also help bite
You can also caulk any gaps but sound will be ok.

100 watts each

I can't get a hand to the back once they are in place.

I can definitely try a larger screw. I was afraid to caulk the gaps thinking the vibration would slide it to the underside of the woofer attachment and affect the sound. Silicone caulk would be ok?

Thanks again
Old 06-01-2016, 03:01 PM
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Silicone is fine. 4200 will yellow of in sun.

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