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ACTIVE EQUALIZATION – The SHUTTLE 3.0® 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 adjust-
able from 150 Hz to 2 KHz with a single control. This filter is typically (but not always) used to reduce or remove offend-
ing 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 3.0® 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 (band-
width) is optimized for its particular functions and is different for each filter.
MASTER VOLUME – The master volume control adjusts the overall volume of the amplifier and the effects return.
Typically, best results are obtained when this control is operated between the 9:00 and 3:00 positions.
OUTPUT LIMITER – The SHUTTLE 3.0® 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 mul-
tistage 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 clipping
as the power amplifier gradually transitions into gentle clipping.
MASTER SECTION STATUS INDICATORS –
•
The "OPERATE" LED indicates that the amplifier is ON and the low voltage power supplies are active.
•
The red "STANDBY" LED indicates that the amp is in "standby" mode and the power amplifier output
de-energized. This led will; Illuminate for approximately 1.5 seconds during power turn–on and turn-off. It will
also illuminate during any internal fault condition such as overheating from. If the stand-by LED stays on,
consult a repair technician.
•
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 centered its soft clip/limit
mode. It is normal that 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.
Note: When driven extremely hard a sharp "chirp" may be audible. This is an artifact of the power amp driven
into clipping and when this occurs the output of the amp should be reduced.
TUNER OUTPUT – The SHUTTLE 3.0® is equipped with a fully isolated Tuner Output. This jack is located after the front
end scaling preamplifier, but is pre-signal shape and pre-EQ. This output may also be used to drive a separate direct box
or high-impedance recording device. The Tuner Output remains active when the amplifier is muted, allowing silent tuning
on stage.
DIRECT OUTPUT – An XLR balanced direct output is provided for connection to a PA system or directly into a recording
studio console or D/A converter. The Direct Out signal may be switched between mic and line level, pre and post EQ, and
the audio signal ground may be connected or lifted from pin 1 to eliminate hum due to ground loops. This output is fully
protected against 48 volt phantom power and may be used for driving microphone lines of up to 300 feet without prob-
lems.
REAR PANEL
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