Originally Posted by CL3P20
just hook your O-scope up to the RCA's and sniff for noise floor in 'dbm'
*Theres lots of variables.. unless you have installed it meticulously.. your best bet is start over. Take special attention to each detail.. like making sure your RCA's run down a different side of the vehicle than your power and grounding. As well.. cheaper types of RCA's can be very susceptible to "catching" EMF.
You will chasing ghosts much longer if you troubleshoot from here.. starting over with the install will make sure you correct the issue. [such as bench testing the unit to see if the noise is reproduced outside of the vehicle].
I dont have an o-scope unfortunatly but it would be quite handy. Also just to confirm this, its coming from the internal amps not any actually external ones. I havnt got that far yet as too start the install this has put my on hold.
I understand what everyone is saying and i do appreciate the help its just I couldnt understand why a cheaper unit sounds ok in my car but yet my dearer unit doesnt :/
I orignally thought it might have been the stock crossovers that came with the car but then the stock stereo worked fine and so did my mates and I didnt remembering hearing the noise/hiss in my old car which is why im so confused at the minute.