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EFFECTS LOOPS – The serial “EFFECTS LOOP” jacks are provided to allow access to the signal for the purpose of
inserting signal processing equipment such as compressors, chorus, delay & reverb processors. Individual pre-EQ
loops are provided for the TUBE channel and the FET channel. An additional MASTER post EQ loop is provided for
the summed (TUBE + FET) signal. This loop may also be used as a PREAMP OUTPUT or POWER AMP INPUT patch
point. “SEND” (output) and “RETURN” (input) are nominal +4 dB level.
“Series” devices (such as compressors and gates) require that the signal ow out from the send jack on the amplier,
through the processing device and back into the return jack on the amplier. Parallel or mixed signal devices (such
as chorus, delay and reverb processors) require that the signal ow out of the send jack on the amplier, through the
unit where it is split into a dry (unaltered) signal and a wet (processed) signal. On the processing unit, you will use the
mixed signal output to return the signals (both wet and dry) to the return jack on the amplier. The ratio between the
wet signal and the dry signal is heard as the amount of effects added back to the original signal, which is controlled by
the mix knob (also called “balance”) on the effects processor. This may be a real knob (as in the Alesis® Microverb), or
software controlled (as in the Yamaha SPX-90, SPX900 or SPX 990). Set the input sensitivity on the effects processor
according to the manufacturer’s instructions.
The front panel MUTE switch will shut all of these outputs down when engaged.
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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.
POWER AMPLIFIER – The SHUTTLE MAX 12.0 uses 2 state-of-the-art, Class D power ampliers with high fre-
quency Switch Mode Power Supplies (SMPS) to achieve unprecedented high performance and lightweight packag-
ing. Switch Mode Power Supplies convert the AC line directly to high voltage DC, then the precision PWM (pulse
width modulation) inverter creates a new AC power signal at a frequency more than 1000 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 rectier and high ESR lter capacitors n-
ish the process off by converting the high frequency AC signal back to the DC voltages that the amplier’s internal
circuitry uses. One advantage of this conversion process is that the DC power supply rails are refreshed more than
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 lter components while increasing
the performance by recharging the power supply rails more often. The Class D amplier uses digital PWM tech-
niques 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 amplier. Essentially, a Class D amplier 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 process-
ing techniques to give a distinctly analog feel and sound to the class D platform. This system provides exceptional
performance even for low frequency applications such as bass guitar.
SPEAKER OUTPUTS – The SHUTTLE MAX 12.0 utilizes dual power amp modules (Amp A and Amp B) each with
its own Neutrik Speakon™ connector (wired 1+/1-). The minimum speaker load per power amp A or B is 4 ohms.
Do not ground either the “+” or the “-” outputs.
The SHUTTLE MAX12.0 dual power amp design offers a variety of available output power choices:
One 8 ohm load (either Amp A or Amp B driven) . . . . . . .375 watts
One 4 ohm load (either Amp A or Amp B driven) . . . . . . . 600 watts
Two 8 ohm loads (Amp A and Amp B driven) . . . . . . . . . .750 watts
One 4 ohm load (Amp A) one 8 ohm load (Amp B) . . . . .975 watts
Two 4 ohm loads (Amp A and Amp B driven) . . . . . . . . . .1200 watts
FOOTSWITCHES – A DIN connector is provided for connecting the
included 5-button footswitch. This footswitch controls CHANNEL
switching and mixing along with all the GLOBAL SIGNAL SHAPE
circuits. Additionally a ¼” footswitch jack is also provided for switch-
ing the MUTE function separately. Any single button latching style
footswitch will operate this function.