I posted this about a year ago and still have same issues.
Here's what's going on.
The engine will stutter or backfire while my subs pound.
Here's my setup
91 chevy 350 single cab.
Powerbass 2200 watt amp
2 powerbass 3xl 12s
2 red top optimas
1 yellow top optima
1 300 amp dc power alternator
1 oem 110amp alternator
What I have done
Under hood are both red top batteries and both alternators
Behind seat is yellow top under seat is amp
Oem alternator runs "main" battery. Truck runs from that
HO alternator is hooked to second red top and that battery is linked to yellow top in rear
Now for safety I have a 300 amp breaker that is under hood and can break the line to rear battery.
The amp is directly hooked to the rear battery.
Now like I said when I crank the amp up the truck will die or stutter or backfire
I have upgraded most engine components thinking I was rattling something loose.
But one day I tried something to test if it's a rattle issue.
The breaker under the hood I'm using to safety the rear battery I can disconnect
The removes everything under the hood for my system and is purely amp to rear battery
System cranks loud truck runs without issue.
Of course system only cranks until battery dies
When truck is running I'm at 14.5 volts main batt and 14.5 for both sub batteries
My theory is the alternator is slowing the engine via the serpentine belt.
I have also tried various battery alternator set ups. Ie all 3 batteries together on the HO amp.
Been doing car audio systems for 20 years and this blows my mind