sporcanm

maybe u have an older model mine is a class D. And the input level is exactly that , nothing like a gain control. you should use a voltage meter to meaure head units output and thenmatch apropriately with amp. use meter on amp and u can match together perfectly.Dont worry about the snr rating has nothing to do with volume only distortion and u will find after matching the voltage precisely u can far exceed the snr. U might want to install noise (ignition/alternator) blockers. they will keep sound perfectly clean and help to keep amp from straining. If all is done correctly,light wont dim, amp wont overheat or distort in any way.Run mine for hrs never have any problem. And the DBS my system reaches will blow you away.