ok so mine at about 50% volume cut off in about half an hour of non continuous play. and they all three do it, the harpoom, the 800.4, and the 600.1. never happened until last weekend.
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There's got to be something in your wireing or settings because even last year at 104 I was pounding mine all day never an issue. I'd have to say if all three are shutting down it's the deck over heating not your amps. The 800 isn't een starting to work just pushing cabins my 800 isn't even at 50% gain and it can over power my exile cabins.
Running the Hybrid tower it takes about 4 hours to overheat the Poon but if I just mute the tower when someone falls or when not pulling people I never have an issue. Also my cubby is full of back packs and towels so very little free air
I'm running a memphis 1100 watt at 1Ohm to a kicker solobaric 12 and then a kicker 500.4 to the 6500.2 tower setup. Kcker cabins and a 4 channel/80w. I felt Davids amps and they were so damn hot you couldn't keep your hand on them for more than a second. I don't crack the cushions or open the port locker and mine don't get near that temp. I'm running the 2 battery setup with perko, 4 gauge main to memphis distribution block, 4gauge power and ground to all 3 amps.
I think the battery is the issue. You've got three pretty big amps running off one battery that never gets shore charged, so the only charge it gets is from the alternator. The stock alternator does not have enough output to replenish what your amps are drawing from your battery especially if you are also running the stereo with the engine off. So every time you go out, your stereo battery is getting more and more drained.
So I think your amps are shutting down because they are not getting enough voltage which I think is also causing them to get hot.
I am sure the experts will chime in but I think this is the problem.
I have the same amps as you except I have a JL M6600 instead of the Exile 800.4. I have two stereo batteries rated 125AH each and a ProMariner 20 amp charger and charge my batteries after every use and my amps never shut down or get unusually hot. I know that not everyone has 120V AC available where they store their boat - I am fortunate enough to be able to store mine in my garage.
Al
This is what I am thinking as well. I think I am going to go with two blue tops and a yellow top along with a pro20 shore charger but I want to make sure this will fix my problem before I spend a grand on all this.
Save yourself some coin, go to Costco, they have group 27 Batteries with a 115 a/h rating. I'm running 3 of them with my system + a separate crank battery.