Hello. This is my first post, so thank you in advance for any input I get on this.. I just purchased a used Brute MJX-4 which the seller claimed to be virtually unplayed since purchase and I have every reason to believe this is true based on the condition. However, once I got it home I noticed a pretty bad hum that I didn't hear when I played it through his amp. Based on my understanding of these things, it seem to be a shielding issue as the hum is reduced (though not eliminated) when touching the strings. I can also reduce the hum almost entirely by orienting the bass in a particular way. Shielding, right? Different patch cables didn't change anything and DI into an audio interface didn't change anything. Hum is reduced with the mix pot balanced between the two pickups however overall output is also dramatically reduced. I've heard a lot of positive things about the Brutes so this leads me to believe that something isn't right with the electronics. This is my first guitar with active electronics, so I have no experience at all with them. I actually thought it might be quieter! And yes, I threw in a new battery. Also, my old ibenez gsr200 that over 10 years or so I've completely butchered with terrible soldering multiple times has less hum and is overall louder output. Again, this was surprising to me, as I expected the active electronics would be a bit hotter.. Anyway, any thoughts are appreciated.