Im not sure to be honest but the original sub series shared the same pickup and pre amp as the sr5 so id say its boost and cut.
I dont own my old sub5 now unfortunately, it made way for a sterling 5 HH.
Hey Steevo, Could I ask if you know if the Controls on your SUB5 are Boost only or Cut and Boost .... I can't seem to find the info anywhere. Thanks in advance