rear speakers

the hissing noise doesnt get louder or quieter regardless of lowering the gain or the headunit/eq volume.

Revisiting... Did you say that your amp was an older RF amp? There's your issue. RF amps S/N ratios SUCK! The proof in this pudding is the adjusting of the gains on the amplifiers, and there being no noticeable change in the amount of hiss in any of the speakers. This also tells us that the devices AHEAD of the amp in the signal chain are quieter than the amps, and you have already posted the specified S/N of 100dB. IMO, that's crap, at best... This gives you a bit of an idea as to the quality of RF gear.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

haemphyst wrote: Revisiting... Did you say that your amp was an older RF amp? There's your issue. RF amps S/N ratios SUCK! The proof in this pudding is the adjusting of the gains on the amplifiers, and there being no noticeable change in the amount of hiss in any of the speakers. This also tells us that the devices AHEAD of the amp in the signal chain are quieter than the amps, and you have already posted the specified S/N of 100dB. IMO, that's crap, at best... This gives you a bit of an idea as to the quality of RF gear.

yeah im guessing it the amp i have now. with the RF amp i had no problems with it. and the 4 channel i have now, when it turns on theirs a big dim in the middle and the sides light up bright. ill just replace it with a different amp and ill go from there. btw, it was refurbished >.<