I have Honda Accord 2007 SE. I installed an amplifeir in it (JBL 4 channel 75.4II http://www.jbl.com/car/products/product_detail.aspx?prod=GTO75.4+II&Language=ENG&Country=US&Region=USA&cat=AMP&ser=GTS ) I also put 4 Infinity kappa speakers.
under high amplification I had some noise under 0 volume, I used high inputs at that setup, and thought the noise was a result of high inputs. I bought a new Pioneer head unit and I use the preamplified inputs for this head unit (RCA). However, after I was finished conencting it all, as long as the amplifeir was on minimum amplification, it sounds great. The moment I pass the 1/4 amplification it becomes really noisy, like 5 times noisier than it was before. Moreover, its a different type of noise, rattaling noise. Does anyone know what may cause it? Anyone had to deal with something like that before? Anyone thinks a ground loop isolator might solve it? (with the amp set to vey low amplification it has no noise and plays perfectly) Any advice?
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