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REAR PANEL
DIRECT OUTPUT – An XLR balanced direct output is provided for connection to a PA system or directly into a record-
ing studio console or D/A converter. The Direct Out signal may be switched between mic and line level, pre and post
gain/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 problems,
TUNER OUTPUT – The SHUTTLE 6.0® 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.
AUX INPUT – A 1/4" unbalanced line level aux input is provided that sums directly to the main output bus, controlled by
the master volume control. This input is ideal for practicing with recorded tracks from a CD player, IPOD, or MP-3 player.
Adjust the level of the playback source to balance with the bass guitar's volume.
EFFECTS LOOP – A rear panel effects loop (SEND and RECEIVE jacks) is provided for connecting "serial" outboard
devices such as compressors, and may also be used for parallel type outboard devices (delays, reverbs, harmoniz-
ers, octavers etc.) by using the mix control located on the outboard device. This loop is located right before the master
volume control and is also intended as a Preamp out / Power amp in connection for possible "chaining" of amplifiers in
a Master / Slave configuration. The effects "loop" contains a "normal switch" in the receive jack that interrupts the signal
path when a plug is inserted into the receive jack. The send jack may be used for an aux. output without breaking the
signal path.
HEADPHONE OUT – A 1/4" TRS jack is provided for connection to headphones for silent practice use. A speaker load is
not required. Do not connect this output to anything but headphones.
FOOTSWITCH – This connector is for connecting the optional 4 button footswitch to the Shuttle 6.0®. Do not use any-
thing but the factory supplied footswitch.
POWER AMPLIFIER – The SHUTTLE 6.0® uses a state of the art, class D power amplifier design and a high frequency
switch-mode power supply to achieve unprecedented high performance and lightweight packaging. Switch-mode power
supplies convert the AC line directly to high voltage DC, then the precision PWM inverter creates a new AC power signal
at a frequency approximately 2000 times higher than the original wall frequency of 50/60Hz. This new high voltage,
high frequency power signal is then fed into a custom high frequency transformer that steps the voltage down, a high
frequency rectifier and high ESR filter capacitors finish the process off by converting the high frequency AC signal back
to the DC voltages that the amplifier's internal circuitry uses. One advantage of this conversion process is that the DC
power supply rails are refreshed 1000 times more often than in traditional linear supplies, thus reducing annoying hum
in the audio signal. The high frequency switching is used to reduce the size and weight of the magnetic and filter com-
ponents while increasing the performance by recharging the power supply rails more often. The class D amplifier uses
digital PWM (pulse width modulation) techniques similar to those in more familiar digital to analog converters to reduce
the size and weight by a factor of 10 times that of a comparably rated conventional class AB amplifier. Essentially, a
class D amplifier converts the analog signal into a logic level PWM digital signal with a digital to analog converter, level
shifts this PWM signal up to a higher voltage and current and then reconstructs the analog signal by passing it through
what is essentially a power digital to analog converter. Additionally, we developed our own, proprietary limiting and signal
processing techniques to give a distinctly analog feel and sound to the class D platform. This system provides excep-
tional performance even for low frequency applications such as bass guitar.
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