Got my Fi Q, Need some help...

[audioholic 5,000+ posts]

Turning the engine off will not make the amp clip prematurely. It will clip at exactly the same level as before, given the same input voltage. If anything, having the engine off will lower input system voltage to the amp, lowering the chances of clipping its output stage.

why not turn your car on

If he has a bad battery, its more easily noticeable when the alternator is not providing current. When the alt IS providing current, a faulty/weak battery is harder to diagnose, but still poses issues to the system.
Its like someone going to the doctor and saying 'my knee hurts when I bend it' and the doctor replying 'then dont bend it'. Stating to just leave the engine on doesn't help locate the problem. Also, some sanctioned events require the engine to be off (or at least, some use to).

 

[Etac 10+ year member]

i think it sounds like a voltage issue

what electrical upgrades do you have?

1200 might be a little high if its like a stock 80 alt + crappy battery

might be wrong tho

 

[nofriends46 10+ year member]

Stinger Power2 1000 Up front Battery

Big 3

Kinetik 600 Rear Battery

 

[bigbangtheory 5,000+ posts]

Maybe your alty is taking a shit.

Check that out as well and might want to consider upgrading.

 

[polofelt 10+ year member]

First, Check all your wires make sure they are connected properly. Second, I which I believe will help you the most, is take your amp up to 2ohms or just get a amp with more juice. Third, Beef up your battery, and if you need to, which it seems like you don't need to, beef up you alternator. If you beef up your battery, go with either a red or yellow top optima, or Kineticks(may be spelled wrong, but google it you will find it) battery.

 

[nofriends46 10+ year member]

I'll check out some alternators

 

[polofelt 10+ year member]

Man, I am loving the pics of that sub, mines on the way to my house now!