I have an SRFF805 that has hiss on the active side of the switch, but not on the passive side of the switch. The hiss is present whether the volume control is full up or full down. Just to re-iterate, it is dead silent on the passive side. I have another active bass (MTD Kingston Artist) that is perfectly dead quiet. It only has an active circuit. Nothing passive. So, I know my brand new cable and brand new amp are not the problem. It is definitely the SR. I've seen a few threads in the forums of others who have similar problems, but not much in terms of resolution. One suggestion was to swap the battery. I plan to try that but wanted to solicit other ideas before I pop all the back plates off and start looking around. Someone else mentioned they were going to install some copper shields, but they didn't report back. Would a $1000 SR really need that? I'd expect a bad capacitor or bad resistor, but lack of shielding would imply a pretty serious design flaw.