I def agree that JL is built tough, and often underrated, just saying putting power in excess of what they need to sound great, vs putting that power to the M series speakers would be a better use of the money your paying for the ability to channel the most power efficiently.
You'd be sending extra power to the Subs and in exchange two pair of the M770s will be (under)powered differently depending on the setup, so I was just saying you could use a diff amp to smooth it out (same 1000 watts), if not your gonna under power something in order to over power something else, vs just giving them all the right power that gets it pounding. If you have diff speakers in the same zones with diff power and you play it loud I would imagine it would play differently, but cant say it would be audible?
I have the same speakers and know your paying good money for them, feed them the power they want, those IB subs can only play so much based on their design of being free-air. I have the same 1000/1 amp pushing my 2 JL 12w3s and even that was kinda overkill based on what I was told in terms of what they needed to perform properly, the ONLY reason I went with that amp is in case I decided to add more subs in the future and even, which I dont need now.
If you try the 1000/5 you would then be able to give the subs 600 rms, and the M770s both towers and in-boats all get 200 rms, vs two pair getting 75 rms and one pair getting 200rms...so you would still have the same total power but more efficiently distributed, in my opinion at least.
And without sounding like a critic, the fact that your dealer wants to throw more than enough power to your subs, but less than ideal power to those M770s is a head scratcher, if they were MX770s I get it, but those M series speakers are meant to be fed, and if you were gonna throw a 600/1 on it then then 1000/5 makes even more sense as it can pump out 600rms @ 2 ohms.
I digress, lol
Hows the painting coming along, any progress on the install?