electrical interference
possibly your wheel bearing is on its way out
not enough oil usually
Not always, but often, interconnects, or another word for them, cables.
Does it do it in neutral when you rev the engine up... if so it's the power steering pump...
A whinig or howling sound coming from a cars wheels means that a wheel bearing is bad and should be replaced.
whining
the wineing is probably the fuel injecters because that is what was wrong with my dads truck.
A worn out clutch release bearing would cause a whining sound when you put your foot on the clutch.
you might have a bad ground connection. Check your RCA plugs behind the head unit. They may be in the input instead of the output. This will cause feedback in the speakers.
What kind of howling? Or is it a whining? Where does it sound like it's coming from.
as the sound comes out of the speakers its an output
An object that produces sound when air causes it to vibrate is called a sound source. This vibration creates pressure waves in the air, which we perceive as sound when they reach our ears. Examples of sound sources include musical instruments, vocal cords, and speakers.