roman_sub Posted February 1, 2017 Share Posted February 1, 2017 Hi guys I'm a recent and v happy owner of a 2012 Fender USA Precision Deluxe (P/J, active / passive tone controls). I'm loving it, but I noticed that when it is in "passive" mode, changing any of the 3 EQ controls seems to have an effect on the tone. I haven't opened up the bass, but I found this a bit strange. It's not drastic, but I can hear the difference when turning the EQ knobs... is this normal? is the active EQ, even nominally bypassed, still loading the pickups / circuit somehow? or is this likely a "defect" -either due to Fender's circuit design, or maybe how prior owner wired in the new passive Dimarzio pickups? Would appreciate any experiences with other active / passive circuits... many thanks Roman Quote Link to comment Share on other sites More sharing options...
roman_sub Posted February 7, 2017 Author Share Posted February 7, 2017 anyone? Quote Link to comment Share on other sites More sharing options...
ikay Posted February 7, 2017 Share Posted February 7, 2017 Er no idea! In the circuit below (USA active Jazz) the active/passive switch completely bypasses the eq when switched to passive. I'm not sure if this is the same circuit as in your bass, it could be an earlier version. [URL=http://s1090.photobucket.com/user/iankay/media/Stuff/Fender%20USA%20deluxe%20jazz%20eq%20circuit.jpg.html][IMG]http://i1090.photobucket.com/albums/i370/iankay/Stuff/Fender%20USA%20deluxe%20jazz%20eq%20circuit.jpg[/IMG][/URL] Quote Link to comment Share on other sites More sharing options...
markstuk Posted February 7, 2017 Share Posted February 7, 2017 Maybe it was modded by a previous owner ? Quote Link to comment Share on other sites More sharing options...
roman_sub Posted February 8, 2017 Author Share Posted February 8, 2017 different circuit (has 3 band EQ, plus passive tone) to the one posted above, but thanks. Looks like bass exploratory surgery it is! Quote Link to comment Share on other sites More sharing options...
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