how long can i keep the music playing with the car sitting there with the engine off before the battery dies?

i have a 95 civic EX with 2 JL 12's, kenwood excelon amp, rockford fosgate speakers

 

Depends how loud and the condition of your battery. I wouldnt do more than 15 mins at loud volumes. But that is just a random number I pulled.

 

wanna buy a fresh new battery and give it a test,

 

On my Expedition it took about 20 minutes... my opinion, dont test it.

 

and the point of this would be?

 

actually i do have a brand new battery i got like a week ago, but i was asking because my engine is running shitty and its convenient to leave it sitting with the engine off thanx

 

How big is your amp? It will also depend on how loud your playing it and the current draw of the amp.

 

it is a kenwood excelon amp. it has the sliding door with the blue triangle that lights up i have no idea how many watts it is but ive been told it should be like 800-1000

 

With an amp in most any car i wouldnt recommend doing that at all. When an amp gets starved for power it stresses and stress causes heat and heat is car audios worst enemy.

I have a 95 integra and am running about 2600watts with a 190amp current draw backed up by a 220/240 amp alternator and 2 yellow tops in the back and 4 caps and i would not play it for 1 min without it running.

But thats just me!!!!!!!

 

How much did you pay for that alternator? 190amps is a friggen a lot of juice.