System power load and source calculation help please!

[RodSlinger]

The system I’m building is, in comparison to some I’ve seen, mediocre, but I want it to perform flawlessly and rather maintenance free.
Here is what I’m currently running.
This is a 2002 Cadillac Escalade base, not EXT
HU: Alpine ilx-207(4v pre-outs) powered via vehicle ignition. Was using all 6 RCA outs, but changed to 4, disabled sub output in HU software.
Processor/Crossover: Stetsom STX-104(variable RCA out 4-9v
Sub Amp: Stetsom EX-1600(1600W RMS @ 1 Ω )
Mid-bass amp: Stetsom HL1200.4(170W RMS @ 2 Ω
Mids amp: Stetsom HL1200.4
Highs amp: Stetsom 1200.4
Speakers:
Subs:2- Focal E KX30 DVC 2 ohm12’s, sealed enclosure tuned to 40Hz
Mid-bass: 4- Memphis MJM622 6.5” DVC 2 Ω subs(700W RMS @ 1 Ω)
Mids: 4- Memphis MJP6(125W RMS)
Highs: 4 Orion HCCATN1 Super Tweeters(175W RMS)
There ya go. Impressive, right? Well, I’ve got to power all this shit.
I have a 320A alternator.
I’ve completed the “Big 3 Upgrade”
I’ve got a Victron Energy 200/2 battery isolator
What I need from you pros is a battery recommendation for the audio. Vehicle battery is an Optima RedTop, but is isolated from the audio.
I have in my possession an Interstate 8D industrial battery, but it doesn’t have any Ah information, however, it is HUGE, and was free.
Should I use the 8D or find something more suitable to my setup?
Any and all assistance would be greatly appreciated.

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[SlugButter]

Damn good looking setup. I’d personally try the free battery, test for voltage drops then go from there, but I’m cheap. Your obviously not cheap with your setup. Seems like you’re in a good position on power already with your 320 amp alternator.

 

[RodSlinger]

Damn good looking setup. I’d personally try the free battery, test for voltage drops then go from there, but I’m cheap. Your obviously not cheap with your setup. Seems like you’re in a good position on power already with your 320 amp alternator.

All in all I’ve got about $4,000 invested. That’s not even one amp for some of these guys on here doing SPL comps. I’m just trying to keep it simple, powerful, clean and LOUD! Thanks!