Bartolini make upgrading your bass as easy as it can be. These bass tone control circuits are packaged as complete wiring harnesses, making for a simple install with minimum soldering required! Just remove your old wiring, pots & jack, drop-in the harness then connect the pickups & Battery! Bartolini preamp harnesses are built around two designs of active preamp.NTBT 2-band (Treb-Bass).NTMB 3-band (Treb-Mid-Bass). All harnesses work with passive pickups only. | NTMB Preamp wiring & description
 | 1. How many Pickups? Look for the configuration that includes the right number of pickups for your guitar. 2. How many knobs? Choose how many knob positions you need. A stacked knob is counted as one knob position. 3. How many EQ bands? Harnesses are available with either two or three bands of EQ control. 4. Switched Active-Passive? Choose an AP version if you want to be able to switch off active EQ & select passive output. |
 | To help you select the right configuration, we show the controls in the listing of each bass preamp harness. Treb - Treble EQ control
TrebBass - Stacked Treble & Bass
Vol - Volume control.
VolVol - Stacked Volume control
Bass - Bass EQ control
Mid - Middle EQ control
Mid* - Mid EQ w/ push-pull mid frequency select
Mix - Blend, pickup mix control
S - Toggle switch mid frequency shift.
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