K&K Sound Trinity Pro User manual

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TRINITY PRO PREAMP
This 2-channel preamp is an extremely powerful yet
small mixer in a belt clip box. It is designed for
mixing a combination of a transducer and an
electret condenser microphone on one instrument to
achieve the best possible transmission.
It offers volume, gain, bass, mid, and treble controls
on each individual channel, and a phase switch on
the mic channel. The tone controls feature an
extended range of up to +/-20 dB, which exceeds
many mixers on the market today. To keep the box
as small as possible, the gain and tone controls are
trim pots inside the unit (small potentiometers for
adjustment with a supplied tiny screwdriver).
During performance, the musician can conveniently
balance the two channels on the volume control
knobs.
Before first use, please insert a 9-volt battery. To
switch the battery off, always unplug the
MAIN/MIX OUT jack.
SETTING UP YOUR PREAMP
1. Remove the snap-off lid by simply lifting it
off. There is no need to undo any screws.
Important: Please do not tamper with the
screw on the bottom of the preamp!
2. Insert 9-volt battery into the designated
compartment.
3. There is a diagram for the internal trim pot
controls on the inside of the lid. In the box
you will find a little screwdriver for the
adjustment of the trim pots. It is attached
with a velcro fastener.
4. Connect your pickups to the stereo input via
a shielded ¼” stereo cable (not supplied)
and connect MONO/MIX OUT via a mono ¼”
guitar cable into an amplifier.
5. If a second mono cable is inserted into MIC
OUT, the channels will be carried
separately. In other words, MIC OUT will
carry only the microphone and MAIN/MIX
OUT will carry only the pickup. A cable must
be inserted in the MAIN/MIX OUT in order
to switch on the battery power.
6. Set your amp to a flat setting first. Our
preamps are shipped with a factory setting
that gets you started. Adjust the gain trim pot
the transducer channel. Adjust bass and
treble trim pots to your preference.

2
HOW THE PHASE SWITCH WORKS
The Trinity Pro Preamp has a miniature phase
switch mounted inside, next to the battery. It is a
sliding switch and you can slide the little tab up or
down with your finger. There are only two settings.
Phase switches are usually marketed as a feedback-
controlling device, but they accomplish more than
just that. Phase determines at what point in time a
sound wave has its peak or trough.
This picture shows two (basically identical) waves,
but the wave on the right (2) is inverted with respect
to the wave on the left (1). Interestingly, if these two
waves were played back simultaneously from the
same speaker source with the same volume, they
would completely cancel each other out and no
sound would be heard. There would be silence.
You know when an amplified signal just doesn’t
“sound right”? In a dual-source system, chances are
it’s a phase-match problem when the sound waves
coming from one source are partially canceling out
the waves coming from another source.
In pickup/mic combination systems, it’s actually a
very common problem that the mic is out of phase
with the pickup. The phase switch allows you to
simply “flip” the sound waves of the mic so that
they match the pickup. The result is that “aaaaahh”
smooth tone that just sounds right.
An out-of-phase problem is indicated by early
feedback and tinny, unbalanced sound. This may be
tolerable in some tone ranges (positions on the fret
board) and quite noticeable in others, even resulting
in sound cancellations on some notes.
The phase switch allows for instant correction of this
problem. By toggling the phase switch back and
forth, you will notice fuller, warmer and nicely
balanced tone with less feedback in one setting.
This is the correct phase switch setting. Keep in
mind that it may be different with different
amplification systems.
PREAMP TECHNICAL DATA
Frequency response: 10-30,000 Hz
Inputs: Instrument jacks 1 Mega Ohm
Output: Instrument jack 10 Kilo Ohm
Battery consumption: 4.5 Milli Amp
Battery life: about 50 hours
All K&K products are designed, assembled and
packaged in USA using mainly US and European
components. Thanks again for choosing K&K.