Hello all Spector users!

After 21 years of bass playing, I finally bought one of my dream basses, a used NS-2A!!!

(as a long time Queensryche fan

)
It's classic white with black hardware and EMGs.
When I opened the back plate I noticed there was no preamp in it. Only two 9volts going directly to the pickups. It seems like the knobs on the front are V/V/T plus one fake knob.
I think the bass sounds great, but how much in tone do I gain if I put in a preamp like the Tonepump???
I hardly never use the EQ on the basses since I use the amp or pedals for all my EQing.
So any thought about preamp or not?
Picture of my new dream bass will come soon