Can be used with any passive bass. Tiny and easy to install! The jack is color coded.
$35 shipped USA-- SOLD!!!!
Here's info from their site
The Redeemer is an innovative buffer circuit that eliminates tone loss caused by the interaction of instrument electronics and the loading effect of the cable, effects units and amplifier. The instrument is effectively insulated from the rest of the signal chain providing these benefits:
IMPROVED NOTE CLARITY
Individual notes within chords are heard with greater detail - harmonics jump right out!
QUICKER TRANSIENT ATTACK
The guitar becomes very responsive to the players picking velocity and strength... This is something you will feel!
ULTRA LINEAR AND TRANSPARENT
The timbre of the instrument stays consistent, especially when “rolling back” the volume controls! No loss of high frequencies when you turn down your instruments volume - It's like having a master volume that keeps your tone the same at any volume level.
PLUG DIRECTLY INTO THE LINE INPUT ON A MIXER
Because the output impedance is less than 300ohms the circuit can easily drive a line input for going direct to a mixer.
This results in a clear, full range of tone that sounds better than using a direct box for live or recording applications.
SUPER AUDIOPHILE SPECS:
Flat frequency response: 10 Hz - 50 kHz!
Noise floor: -125 dB!
Input Impedance: > 2M ohms
Output Impedance: < 300 ohms
Current Draw: < 2.5mA
Power: operates from 9v to 18v
Phase response: between +/- 0.1 degree from 20 Hz to 20 kHz
Dimensions: 0.4" x 0.8" x 1" (metric = 1.0 cm x 2.0 cm x 2.5 cm) and a 9 volt battery