Humming noise in car while on idle. 98 maxima?

I thought it might of been the power steering fluid or pump. But I don't know if it is. There's also a big amp installed in the car. Could that be it?

Hey all, I recently got a 2001 Mitsubishi Eclipse, and since it is used, it's sound system is starting to falter.

I want to get a new sound system, but I do not know what to do.i do not know anything about cars (I'm 18), so I wanted to know what I had to do to replace the stereo system, and the speakers.

Do I have to get the components first, and then get them install at the shop? Or does the shop sell the sound systems and speakers as well?

This is to hook up an amp and subwoofer to the cd player

The amp has the two jacks in the back the red and the white

But the CD player has two options, the red and white option, and Sub out mono option. The Sub out option also has two rca things but they are just white.

So which ones do you use? And what's the diffence?

Since your sub is a d4 it can be wired for 2 ohms (coils parallel) or 8 ohms (coils series).

The amp is about the perfect amt of power (480w) if you wire the sub for 2 ohms.

Max ratings are meaningless.

A car's electrical system produces 12.5-14.4v.
Every electrical device in the car operates on that voltage.

CURRENT is the issue when you start adding electronics. A car's alternator generally produces 100-140A. Typical stock current demand is in the 40 to maybe 70A range.
A small-mid size speaker amp may require 20-50A at high volume (5-15A on average).
But a big subwoofer amp may be capable of drawing 100-150A (30-50A average) at high volume.
That can stress an alternator and cause failure in a matter of months vs several years with only stock electronics.