U.S. Masters Acoustic Bridge System for Electric Bass

The above image is an EP52 maple body bass with a lined fretless pao ferro fingerbaord in tobacco sunburst with gold hardware. It has our standard MultiVoice Passive Tone Circuit with the addition of the Acoustic Bridge System for Bass. The MultiVoice Tone Circuit provides for a diverse range of sounds from the bass and the effect of the circuit interacts with the pickup selection and whether the pickups are in humbucking or single coil mode. The controls function as follows:

V - volume (electric bass pickups)
B - blend (between electric bass pickups)
P - pickups coil tap - down, pickups are in their normal series humbucking mode, up changes pickups to single coil mode
C - Voicing Contour - center off, up is high frequency rolloff with an upper-mid emphasis, down cuts the mids and contours lows and highs
F - Voicing Frequency - up causes the voicing to effect a higher frequency, down effects a lower frequency
D - tone (voicing) depth - this controls the depth of the tone contour of the MultiVoice Tone Circuit from no effect (all the way up) to full effect
O - Output Selector - selects whether the electric bass pickups are operating (down), the acoustic bridge pickups are operating (up), or both are on (middle). When both are on the balance of the two is controlled by their respective volume controls.
A - acoustic volume - controls the volume of the acoustic bridge pickup system
M - Acoustic Mid Boost - boosts the midrange of the acoustic bridge signal only
Lower Output Jack - outputs the electric bass signal independent of the acoustic bridge signal. Plugging into this jack disconnects the electric bass signal from mixing into the acoustic bridge preamp for output from the other jack. This allows each signal to be amplified independently.
Upper Output Jack - outputs the signal from the acoustic bridge preamp. With a mono cable plugged in it outputs a mix of the electric and acoustic pickups unless a plug is in the other jack. With a stereo cable plugged in the acoustic signal is on the tip and the electric signal is sent separately on the sleeve so each can be amplified independently. Plugging into this jack runs the 9 volt battery so it is best to unplug from this jack when the bass is not in use so to increase battery life. The acoustic preamp uses a 9 voly alkaline battery. The electric bass circuitry does not use the battery at all.

Contact:
U.S. Masters Guitar Works
2324 Pinehurst Dr. Unit B
Middleton, WI 53562 USA
Ph (608) 836-5505
Toll Free Sales and Technical Support (877) 716-0000
e-mail: sales@usmasters.com