ACTIVE EQUALIZATION
– The SHUTTLE 9.0® contains an active 3 band equalizer with sweepable parametric
mid range frequency control. This equalizer, similar to those found on professional sound consoles, is a very useful tool.
The low frequency EQ section is an 80 Hz shelving curve with 15dB of cut or boost. The high frequency EQ section is a
4 KHz shelving curve with 15dB of cut or boost. The parametric sweepable-mid frequency section features 15 dB of cut
or boost with a bandwidth approximately 1 octave wide. The center frequency of this filter is continuously user adjustable
from 150 Hz to 2 KHz with a single control. This filter is typically (but not always) used to reduce or remove offending
frequencies in the instrument’s pick-up response, or boost response to achieve a particular voicing. Spend some time
experimenting so that the process becomes creative as well as corrective. Note that our active equalizers are very wide
response and a little bit can go a long way.
SIGNAL SHAPE
– The SHUTTLE 9.0® is equipped with 3 Signal Shape circuits. The L.F. BOOST adds low frequency
peaking gain in the 38-67 HZ band. This filter is especially effective when used with a 5 string bass. The MID SCOOP
switch generates midrange cut centered at approx. 600 Hz, the H.F. ATTACK adds a peaking high frequency boost in the
2.25-8 KHz band. LED indicators are provided to visually show when each filter is engaged. Each filter Q (bandwidth)
is optimized for its particular functions and is different for each filter. These functions are also foot-switchable from the
optional 4 button foot switch. The switches on the amplifier’s faceplate must be in the “out” position for the footswitch to
work properly.
MASTER VOLUME
– The master volume control adjusts the overall volume of the amplifier and the effects return. Typi-
cally, best results are obtained when this control is operated between the 9:00 and 3:00 positions.
OUTPUT LIMITER
– The SHUTTLE 9.0® contains an internal power amplifier “Soft Clip” Limiter. This Limiter allows
simulation of tube output stage saturation as the amplifier nears it maximum power. The limiter is a compound
multi stage analog circuit, is quite graceful in nature, and is particularly musical sounding, even when driven hard.
The output “LIMIT” LED shows limiting action at the maximum power threshold and then indicates power amplifier clip-
ping as the power amplifier gradually transitions into gentle clipping.
MASTER SECTION STATUS INDICATORS -
•
The “POWER” light indicates that the amplifier is ON and the low voltage power supplies are active.
•
The red “PROTECT” LED indicates that the amp is in “protect” mode. This led may flash during power turn-on
and turn-off. This is normal. It will also illuminate during any internal fault condition. If this happens, turn the
amp off and consult a repair technician.
•
The red “THERMAL” LED indicates that the amplifier has over-heated, engaged the protection circuit and
shut down. This circuit is self-resetting when the offending condition is corrected, i.e., blocked fan
vents, stuck fan, 2 ohm operation, etc.
•
The blue “SIGNAL” LED indicates that the power amplifier is receiving signal (over several watts output) and
is performing properly.
•
The “LIMIT” LED indicates that the power amp is near its maximum power and has entered its soft clip/limit
mode. Under high output conditions this LED will light with the strongest pulses of the signal. Driving hard
beyond this point will cause the amplifier to gradually begin to clip.
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