Battery running dead?

[Vibe_I_C_E]

I have 2 amps in my boot, 1 that draws power straight from my battery then the second is a thinner add-on cable which draws power from the cable connected to the battery, audio is input to one amp then from that one is sent to the other (if this makes any difference?). the remote for the main amp is connected to the HU and i think its the right port? and the second amp is connected to the remote connector on the main amp. But for some reason if i leave the car for a few days the battery seems to die?
Is this because the amps are constantly drawing power from the battery some how or is it a dud battery?
Thanks

[Vibe_I_C_E]

Oh and since i put the second amp in my rear speakers have started whistling?? any ideas

[Rogue_Shadow]

Surely you should use a distribution block.
One Great AWG cable feeding the block and two other cables running form the Block to the amps.

But that shouldn't drain you battery that serve. Have you checked all other wiring such as the remote wiring?

Have you ruled out your battery? Could well be not holdings its charge anymore.

Best test. Disconnect your ICE for awhile and see if your battery still dies.