#1
My new bass that im getting has a 9volt in the back..... why?
Gear
Ibanez SR400QM
Squier P-Bass
Fender Rumble 100 2x10
Concertmate-990 Keyboard
BBE Stomp Sonic Maximizer
Squier Stratocaster
Fender 15w Guitar Amp
#2
It's to power either a) The pickups or b) The pre-amp. It will probably be the pre-amp in this case.
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#3
yeah it could have active eq or pick ups look on the manufactuers website
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#4
from wiki:

Active pickups require an electrical source of energy to operate and include an electronic preamp, active filters, active EQ and other sound-shaping features. They can sometimes give much higher possible output. They also are less affected in tone by varying lengths of amplifier lead, and amplifier input characteristics. Magnetic pickups used with 'active' circuitry usually feature a lower inductance (and initially lower output) winding that tends to give a flatter frequency response curve.

The disadvantages of active pickups are the power source (usually either a battery or phantom power), cost, and less defined unique tonal signature. They are more popular on bass guitars, because of their solid tone; most high-end bass guitars feature an active pickup. Most piezoelectric and all optical pickups are active and include some sort of preamp.

The main advantages of active pickups are that they are hum and noise free, at least compared to their passive single coil counterparts, as they require no ground wiring to connect to ground, which also may isolate the player from being electrocuted, should the wiring elsewhere, in other equipment such as a guitar amp, have become hazardous in any way.
#5
What's the bass? Most likely it's to power onboard EQ (so you'll have knobs for bass and treble, and maybe mids too.) Actives are great IMO.
#6
Thanks guys I understand now. It's a Ibanez SR400. It has a preamp. I know with active Pups you cant leave the cord in without the battery dying, is this also true for the preamp?
Gear
Ibanez SR400QM
Squier P-Bass
Fender Rumble 100 2x10
Concertmate-990 Keyboard
BBE Stomp Sonic Maximizer
Squier Stratocaster
Fender 15w Guitar Amp