K&K Sound Bass Master Rockabilly User manual

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BASS MASTER ROCKABILLY SYSTEM
The Bass Master Rockabilly is a double bass
transducer system designed specifically for
Rockabilly and Slap Bass. It combines two
transducers (the Bass Max and a fingerboard
pickup) to create an integrated double bass pickup
system that brings out the percussive and subtle
fingerboard sounds, as well as strong and warm
bass tones. Each Bass Master Rockabilly can be
fine-tuned via the separate bass and treble controls
within the dual channel preamp, providing an
infinite range of combinations for every player and
any style of play.
The Bass Master RB Upgrade System includes a
fingerboard pickup and preamp to upgrade from an
existing wing transducer (or other compatible
pickup). Please skip this section (Installation and
Setup: Wing Transducer) for the Upgrade System.
INSTALLATION AND SETUP
Wing Transducer
You can attach the wing transducer on either side of
the bridge. We recommend trying the low string (E
string) side first. If the slot is too narrow, DO NOT
FORCE THE PICKUP INTO THE SLOT! YOU WILL
BREAK THE PIEZO CERAMIC ELEMENT AND VOID
THE WARRANTY!
For the right fit, you may have to remove some
material from the lower part of the bridge. You’ll
achieve best results with a snug fit. If the slot is too
big, please insert some cardboard or veneer to
build it up.
Fingerboard Pickup
We suggest you place the fingerboard pickup near
the top of your fingerboard, on the reverse side. The
wire should travel behind your fingerboard, through
the bridge center "heart" (or the unused wing slot, if
the heart is too small).
Before you proceed to attaching the fingerboard
transducer, thread the transducer and wire through
the heart. A small piece of foam is supplied to
isolate the wire from bridge vibrations; wedge it into
the bridge “heart” and cut a small slit in it. If the
foam block is too large, trim it, but allow enough
excess material so it stays in place when
compressed, isolating the wire.
Pickup Installation
1. Cut a small piece from the double-sided tape,
wide enough for the pickup, and peel the off the
wax paper. Press the tape (on the brown
backing) in place behind the fingerboard. See
the next section, Placement of the Fingerboard
Pickup, for more detailed placement instructions.

2
2. Peel off the brown paper to leave the thin
adhesive layer on the wood. Press the pickup
onto the adhesive. (Note: Never remove the
pickup by pulling on the wire. Carefully use a
thin blade to pry it off.)
3. You may want to use masking tape to secure the
wire along the back of the fingerboard while
you’re settling into the final position for the
pickup.
4. Once you’re ready for permanent installation,
tack the wire to the remaining double-sided
tape, taking care that it is firmly adhered and
there is no possibility of it vibrating or buzzing
against the fingerboard.
Placement of the Fingerboard Pickup
The fingerboard transducer delivers a very different
tonal character and resonant depth depending on its
placement. Fingerboard backside construction
varies, but most are squared off at the neck joint,
and then scooped out as the fingerboard continues.
The sound changes character as you move from the
solid section of the fingerboard towards the thinner,
hollowed out areas. The pickup's edges are cut to
allow flat placement in any location as the
fingerboard profile changes.
You are strongly encouraged to experiment with
placement at various thickness near the top of the
fingerboard, in order to produce the type of tonal
response that you desire. Sufficient double-sided
tape is included so that you can move the
transducer to a different location, listen, and move it
again.
PREAMP SETUP & SOUND ADJUSTMENT
Snap off the preamp lid and insert a 9-volt battery.
You do not need to remove any screws, the lid
simply snaps off. Important: Please do not tamper
with the screw on the bottom of the preamp!
You will find that the wing transducer has a higher
output than the fingerboard transducer, so we
recommend that you begin by reducing the internal
gain trimpot for the wing transducer (Channel 2) to
minimum, and adjust the fingerboard transducer
(Channel 1) gain trimpot to maximum; this can be
fine tuned later.
We also suggest that you begin with your
amplification system set flat, and proceed by
adjusting the internal bass and treble controls one
channel at a time, with the external volume for the
other completely off. Since each channel has a +/
20dB range, minor adjustments have a great effect
on the sound. Make changes very gradually.
Once each channel has been individually adjusted
to your preference, they can be blended using the
external volume controls. You may wish to leave
the preamp open to continue making adjustments, to
fine tune each channel's bass, treble, and gain
controls, as well as your amplification system, to
achieve the response you prefer.
Channel 1: Wing Transducer
Channel 2: Fingerboard Transducer
Unplug the output cable at the preamp when not in
use to conserve battery power.
TECHNICAL DATA
Wing: 22 mm diameter, 4 mm thick
Fingerboard: 12.5 (two edges trimmed), 0.7 mm
thick
Preamp: 3" x 3.5" x 1 "
Input Impedance: I Mega Ohm (each channel)
Output Impedance: I0 Kilo Ohms
Input: Stereo ¼” Output: Mono ¼”
Cable: 6 foot, ¼” stereo plugs
Power: 9-volt battery (not included)