FRONT PANEL FEATURES
1. INPUT LEVELS AND MIXING 1-7
The
KB1000
has 7 inputs which are combined to produce a single stereo or mono output.
The
INPUT LEVEL
control is used to set the input level and how much signal is mixed.
To make sure you have plenty of headroom for mixing, the keyboard output levels should be
set so that turning the
INPUT LEVEL
to at least “7”, preferably “10” will not cause clipping.
The red
CLIP
LED indicates when the input is close to clipping. To avoid clipping, reduce the
keyboard level first, then turn down the
INPUT LEVEL
knob if the clipping persists. The green
SIG
LED indicates a signal is present at the input ONLY when the
INPUT LEVEL
is turned up.
2. INPUT JACKS
Two 1/4” phone jacks are provided on each of the 7 channels to accommodate both stereo and
mono instruments. Plugging mono sources into the “R” jack of an
INPUT
will send signal to
both
LEFT
and
RIGHT
outputs. You can double the amount of inputs by choosing to run in
“
MONO
” mode and plugging into all
14
(
1-7, L&R
) input jacks, without regard to stereo assign-
ment. Adjust keyboard output levels to mix L&R inputs accordingly.
3. AMP EQ CONTROLS
The
AMP EQ
tone controls consist of a
LOW
,
LO MID
,
HI MID
and
HIGH
controls. These con-
trols DO NOT affect the
DIRECT OUT XLRs.
Since most of the tone shaping is done within the
keyboard itself, the
AMP EQ
controls are designed to accomodate for differences in speakers
and acoustic environments. The
LOW
control affects the lowest frequencies. Excessive “BOOMI-
NESS” can be reduced by turning the
LOW
control down while turning it up can add fullness
to your sound. The
LO MID
control adjusts frequencies in the 300Hz range adding extra punch
when needed. The
HI MID
control adjusts frequencies in the 2.5kHz range allowing you to
“cut through” on a crowded sound stage. The
HIGH
control knob is designed to cut or boost
the highest frequencies. Usually a “dead” room will will require a boost from the
HIGH
con-
trol while a “live” room with a lot of reflective surfaces will invite you to reduce the
HIGH
con-
trol. Note: boosting the high frequencies can result in increased hiss. This is normal. The
AMP EQ
is a sound shaping tool which may require some practice to get the best results. Listen
to the results and experiment with different settings.
4. DIRECT OUT XLR
s
The
DIRECT OUT XLRs
are balanced outputs that get their signal directly from
INPUTs 1-7
.
These outputs are very useful when connecting to the main mixing board for live performances
or recording. Use the
DIRECT OUT LEVEL
control to set the output. The
MONO
switch is used
to combine the
LEFT
and
RIGHT
INPUTS so that both
L-R DIRECT OUT XLR
jacks receive the
same mono signal.
NOTE: THE DIRECT OUT MONO SWITCH DOES NOT AFFECT THE STEREO
OR MONO OUTPUT OF THE POWER AMP
. A
LIFT GND
switch is also available on the
DIRECT
OUT XLR
jacks. Set this switch for the lowest hum/noise when using this output. When the
LIFT GND
switch is depressed, the signal ground is lifted from these jacks thus eliminating
any ground loops between the
KB1000
and the gear it’s feeding.
NOTE: THE AMP EQ, POWER
AMP 1&2 AND MAIN LEVEL CONTROLS DO NOT AFFECT THE DIRECT OUT SIGNAL.
5. DIRECT OUT LEVEL
The
DIRECT OUT LEVEL
control sets the output for the
DIRECT OUT XLRs ONLY
. It will not
affect the volume coming out of the amp speakers or the rear line outs. Communicate with
the mixing engineer to set the proper level.
6. DI MUTE SWITCHES (ON INPUTS 6&7)
Inputs
6
and
7
feature
DI MUTE
switches. When pressed “IN”, signals from inputs 6 and 7
will be REMOVED from the
DIRECT OUT XLRs,
but will still be heard through the
AMP 1&2
speaker outputs,
PHONES
jack and rear
LINE OUT
jacks. This is useful for listening to “click”
tracks, monitor feeds or other sources WITHOUT sending these signals to the
DIRECT OUT
XLRs
and to the house system.
7. ELECTRONIC X-OVER (BI-AMPING)
When the
BI-AMP
switch is pressed “
IN
”, the amp is in the bi-amp mode. This means all fre-
quencies BELOW the
X-OVER FREQ
are sent to the
POWER AMP 1 OUTPUT
, while frequen-
cies ABOVE the
X-OVER FREQ
are sent to the
POWER AMP 2 OUTPUT.
To select the crossover
frequency, rotate the
FREQ
control knob until the desired frequency is obtained. Try
800Hz
. A
bi-amped system gives the user greater control over the tone. This allows speakers designed
for specific frequencies to be utilized to their fullest potential. Subwoofers will be more effi-
cient at reproducing low frequencies with less distortion. Full range enclosures will not have
to work as hard reproducing the lowest frequencies which consume the most power.
Stereo
(L-R) separation from the power amps is no longer possible, but is retained at the DIRECT
OUT XLRs and PHONES jack
.
NOTE: BI-AMPING DOES NOT NECESSARILY DELIVER THE MOST VOLUME
FROM YOUR SYSTEM.
8. OUTPUT CONTROL GROUP–MAIN, AMP 1L, AMP 2R
The output group controls the volume and amp output levels. The
POWER AMP 1 & 2 CON-
TROLS
adjust the volume to the individual amps. The
MAIN
control sets the overall volume.
Try setting the
MAIN
control to 5 as a starting point.
FULL RANGE MONO (KB1010) AND STEREO:
For
KB1010
operation push the
MONO
(MAIN)
switch
IN
. Turn up the
AMP 1L
knob on the
KB1010
until the desired volume level is reached.
If your are connecting a pair of speakers for stereo use, be sure to release the
MONO
(MAIN)
switch. Turn up the
AMP 1L & AMP 2R
knobs until the desired volume level and left and right
balance is reached.
BIAMP CONTROL(combos):
To set the balance, bring up the
AMP 1L (LOW FREQ)
knob until
the desired volume level is reached. Now bring up the
AMP 2R (HIGH FREQ)
knob until the
desired balance has been achieved.
BRIDGE
mode, use only the
AMP 1L
control, as the
AMP 2R
control becomes ineffective. If
either of the red
PK
LEDs flash for
AMP1 or AMP2
, reduce the
POWER AMP 1 or 2
volume
or, engage the
LIMITER
switch on the rear panel.
9. MONO (MAIN) SWITCH
With the
MONO
switch in the “OUT” position, the
KB1000
will preserve stereo imaging from
the
INPUT JACKS
to the
POWER AMP 1(L) & 2(R)
outputs. Setting the
MONO
switch to the
“IN” position will send the combination of both
LEFT
and
RIGHT
signals to both
POWER AMP
OUTPUTS
. Helpful if only one speaker cabinet is used, or if stereo imaging is not important.
NOTE: THE MONO (MAIN) SWITCH DOES NOT AFFECT THE STEREO OR MONO OUTPUT OF
XLR DIRECT OUTS.
10. PHONES JACK
A
PHONES
jack is provided for practicing or monitoring. The
MAIN
knob controls the volume.
The phones jack does not interrupt the amplifier output. To listen to the
PHONES
output with-
out sound from the speakers, turn down the
POWER AMP 1&2
controls. A high-current head-
phone amp drives this output for any pair of headphones.
REAR PANEL FEATURES
11. POWER / (RESET)
Push the upper portion of the POWER SWITCH to turn the amplifier on. If the
POWER
LED is
on but no sound is coming out of the speakers, the amp may have gone into one of its pro-
tection modes with the
PROTECT
LED ON. To reset the amp, turn the power off for one minute
and then turn the amp back on. If the problem persists, check for;
a)
The speaker impedance
is too low for the bridge output (4 ohm min.) or normal outputs (2 ohms min. per amp)
b)
bad
speaker cable,
c)
damaged speaker or
d)
blocked rear fan cooling vents.
12. COOLING VENTS
The rear vents cool the internal power amps. Provide a minimum of 3” clearance for adequate
ventilation. Blocking the air flow to these vents will cause the amp to thermally protect and
turn the speaker relays off. The
PROTECT
LED on the front panel will light. If this happens,
clear the obstruction first, keep the power on, allowing the amp to cool. The amp will engage
the speaker relays when cooling conditions return to normal.
13. LIMITER SWITCH
The
KB1000
features distortion-free, optoislator power amp limiters. Limiters help prevent
power amp clipping by reducing peaks before they reach the amp. To use this feature, press
“IN” the
LIMITER
switch.
6
4
5
8
9
1
2
7
3
10
11
