installing subs.. problem. no sound but whirring noise from factory speakers

[zachsmthsn]

ok, so i'm trying to install subs for a buddy of mine, and i've hit a road block or two. first road block was i was trying to do it for him in about 30 minutes with literally no tools at all in the wal mart parking lot. hah, but i won't get into that. i got everything hooked up, wires hidden and everything, and i was testing it out. when i turned the car on i noticed this really loud whirring noise, almost like a really loud 6 inch, or so, fan. i went to the back of the car and the noise was coming from the rear factory speakers. it was really weird. also, the subs were getting no power, or something, because they were not working. when i pulled the rca wires from the back of the amp, the whirring stopped. i don't understand what the rca's would have to do with the factory system. i tried moving the ground to different places, moving the remote wire, everything i could think of on the spot. and the sub worked, because i tried it in my car with my system and it was working fine. i also don't exactly know what's going on, because the amp does not have a light on it indicating if it is on or not. makes this a lot more difficult... it may be a amp problem, i'm not sure. has anyone seen this before or know of anything that may work to fix it?
btw, pioneer HU, Sony Xplod 15'' sub, and i'm not completely positive on the brand of the amp, but it's 750 watt.

i can get more information if y'all need it, it's just in someone else's car and not readily available.

[CONRAD29]

whats the remote wire hooked up 2 power switch goin to the battery right after market radio remote hooked to to the radio did u check the fuse on the amp subs will be fine but 15 i doubt that a 50 watt amp is evan gunna move that big old thing

[zachsmthsn]

a little confused on what you said, but the remote wire is hooked to a fuse in the fuse box that comes on when i turn the radio on. and there were two slots for fuses and onlye one was full, so i took one from mine and put it in there, and it still didn't work. but what would cause that whirring noise?
and i've told him eventually he needs a new amp cus what he has is tiny.

[nicefighter80]

the whriling noise... sounds like destorshion (sorry for spelling) like the rca cables transmit sound to the amp so if the power cable is near the rca cables then the power going to the amp could interfear with the sound going though the rca cables.
good way to check this is does the whriling noise change when u slowly rev the engine? if yes then its what i said above ^^^^
the fix move the cables away from each other
hope this fixes it

edit: now the second problem check the ground on your amp i had the same problem but after securing my ground better it dixed the problem