3ZB Drawings and Wiring Documents

The 3ZB Preamps have been replaced by the Pro Z preamps.

General Wiring Instructions for all configurations 2 pages 8.5x14 (legal) tri-folded.
A copy of this document is shipped with each 3ZB preamp.

If you want more detail below are links to our older set of the instructions.
This is probably longer than most players or installers want to read...
Old Version Wiring Instructions 9 pages 8.5x11 (letter).
Example Installation including adding shielding to the cavity of an electric bass.

Wiring Diagrams:

We ship the preamp configured and pre-wired, as specified in your order.
These drawings are provided in case you want to change/update your configuration later.

These are the base configurations - each drawing covers the additional user specified customizations including stacked controls, and single or dual batteries.

Configurations for Single Pickup
• Volume, No EQ
• Volume, 4 Band EQ
• Volume, 2 or 3 Band EQ, optional Mid Freq Sw

Configurations for Single Pickup with Active/Passive Switch
• Volume, No EQ
• Volume, No EQ, Tone
• Volume, 4 Band EQ
• Volume, 4 Band EQ, Tone
• Volume, 2 or 3 Band EQ, optional Mid Freq Sw
• Volume, 2 or 3 Band EQ, optional Mid Freq Sw, Tone

Configurations for Dual Pickups
With Volume, Volume controls
• Volume Volume, No EQ
• Volume Volume, 4 Band EQ
• Volume Volume, 2 or 3 Band EQ, optional Mid Freq Sw

With Volume, Balance controls
• Volume Balance, No EQ
• Volume Balance, 4 Band EQ
• Volume Balance, 2 or 3 Band EQ, optional Mid Freq Sw

Configurations for Dual Pickups with Active/Passive Switch
With Volume, Volume controls
• Volume Volume, No EQ
• Volume Volume, No EQ, Tone
• Volume Volume, 4 Band EQ
• Volume Volume, 4 Band EQ, Tone
• Volume Volume, 2 or 3 Band EQ, optional Mid Freq Sw
• Volume Volume, 2 or 3 Band EQ, optional Mid Freq Sw, Tone

With Volume, Balance controls
• Volume Balance, No EQ
• Volume Balance, No EQ, Tone
• Volume Balance, 4 Band EQ
• Volume Balance, 4 Band EQ, Tone
• Volume Balance, 2 or 3 Band EQ, optional Mid Freq Sw
• Volume Balance, 2 or 3 Band EQ, optional Mid Freq Sw, Tone

Mechanical Drawings:

A dimensioned drawing of the potentiometers, switches, output jacks and LED.
• Mechanical Drawings