Hello everyone, Yesterday I heard my amp hissing whenever I played a note with my reggie hamilton Jazz, it's an active Bass with an active/passive switch when i switched to passive, the hissing disappeared, so clearly my battery has run out. Strange enough, this doesnt affect the passive setting. Now, we all know that when you let an active bass plugged in it drains the batteries so, when I let the bass plugged in when it's on passive mode will it still drain the batteries? since the passive setting doesnt use the batteries at all, maybe it goes through a different circuit and bypasses the batteries entirely? and as a bonus question, it uses 2 9v batteries instead of 1, why is this?