4
Low Rotor Effect: This controls the amount of low rotor simulator effect. The circuit design is unique to
the speaker placement and angle of the KBR-3D’s cabinet. Typical settings of 7-9 are best. This
is also a personal preference control.
Overall Rotary Tone: This is a combination of contour, low rotor level and bass settings. If overdrive
distortion is part of your sound, set that first with the pre-gain and post-gain controls and then set
the low rotor volume, contour and bass. The personal preference settings of these controls provide
a wide range of overall sound, covering many styles of music past and present.
-STEREO CHANNEL-
The KBR-3D’s stereo section employs high fidelity design throughout, from the low noise pre-
amp to the 100/100 watt power amplifiers. The unique angled front allows maximum effect from
the stereo field expander. The expander, speaker arrangement and cabinet angle will enhance and
spread a stereo signal source into a field much wider than the cabinet itself. The expander relies
on a stereo sound source and the effect will vary according to the quality of the source.
Input 1: When a stereo input is applied to the left and right channels, the stereo expander is
functional. If a signal is applied to the right/mono input only, it is routed to both left and
right tone controls and power amplifiers. Input 1 left and right inputs can also be used as
independent amplifiers although the volume and tone controls are global.
Input 2: When a left and right stereo signal is applied, it is routed to the tone controls (global) and
to the power amplifiers. The right/mono input will send a mono source to the tone
controls and both amplifiers. Input 1 and 2 can also operate as independent amplifiers
with global tone and volume controls.
Expand: This circuit operates on input 1 only. The expand switch and corresponding yellow
indicator selectively enhance the difference between the left and right sounds of a stereo
signal. The better the signal source, the more profound the apparent expansion of the
sound field. With some signal sources, tone will change when the expander is turned to
extremes. A small tone control adjustment may be desirable. It is best to use the lowest
effective expander setting. The on/off expand switch allows fast A-B comparison of the
effect.
Do not use the expander
if input 1 is used with a mono source or as two separate
amplifiers with separate instruments. No harm will be done but the effect will be
unpredictable.
Bass:
The bass control operates from 150 Hz down. Bass generally uses a lot of power and
should be adjusted carefully to match the playing venue and instrument complement. If
you have a bass player, try settings of 0-5. This is a personal preference control.
Middle: This control operates from 150 Hz to 3 kHz and adjusts the fundamental sound of most
keyboard instruments. Levels of 3-7 are common. This is a personal preference control.
Treble: This controls frequencies from 3 kHz to 20 kHz. The high-sizzle and clarity are set here.
Treble can be very piercing and because of the “spongy” nature of air is quickly
absorbed. Don’t fry your ears on stage with treble-heavy sound that may never reach the
audience. A typical setting would be 4-8.
