Owner’s Manual
Model# STL6-2
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PRODUCT DESCRIPTION – The SHUTTLE 6.2 represents the 2nd generation
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of our widely acclaimed SHUTTLE series of light weight, high output bass
amplifiers. This model has been designed with our unique ULTRA LIGHT
unified design process, yielding a 600 watt professional high powered tour-class
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bass guitar amplifier, weighing only 3.75 lbs! This 2nd generation SHUTTLE
amplifier now incorporates our unique 3-Dimensional Power Management
circuitry along with other enhancements like increased tube gain and high
efficiency thermal management.
Our proprietary 3DPM™ technology insures greater and more solid sounding
output while retaining the feel and playability of a more traditional tube based
power amplifier. When driving the power amp hard the player can feel
increased heft and girth of the individual notes, while maintaining dynamics and
articulation. The result is an amplifier that achieves a more 3 dimensional tone
and feel, like a tube amplifier power section, without the anemic flatness other
amplifier designs can exhibit. This compact design blends the best of analog
and digital platforms to produce the ultimate in warmth, punch and power.
Model# STL6-2-210T
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The SHUTTLE 6.2 is equipped with a ¼” unbalanced instrument input, preamp
stage clip detector, mute switch with LED indicator, 12AX7 tube preamp with
extended range variable input gain, 3 switched signal shape filters with LED
indicators, 3 band active equalization with sweepable midrange frequency,
master volume control, proprietary 3DPM™ power management, ¼” tuner
output, aux. input, effects loop, balanced direct out with ground lift/pre-post/mic-
line switches, headphone output, and 2 Neutrik NL-4 “Speak-On”™ speaker
jacks.
The power amp is a powerful, light weight Class D design and is supported by a
state-of-the-art high frequency Switch Mode Power Supply (SMPS), which does
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away with the weight of a traditional power transformer. The SHUTTLE 6.2’s
power supply is usable from 100-240 volts, lending itself well to international
touring players.
Model# STL6-2-12T
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ACTIVE EQUALIZATION – The SHUTTLE 6.2 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 15dB
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.
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SIGNAL SHAPE – The SHUTTLE 6.2 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.
Typically, best results are obtained when this control is operated between the 9:00 and 3:00 positions.
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 “PEAK” LED indicates that the power amp is near its maximum power. Under high output conditions it is normal
for this LED to light with the strongest pulses of the signal. Driving hard beyond this point will cause the amplifier to
gradually begin to clip which may become audible.
3DPM™ --- 3 DIMENSIONAL POWER MANAGEMENT --- Our proprietary 3DPM™ technology insures greater and
more solid sounding output while retaining the feel and playability of a more traditional tube based power amplifier.
When driving the power amp hard the player can feel increased heft and girth of the individual notes, while maintaining
dynamics and articulation. The result is an amplifier that achieves a more 3 dimensional tone and feel, like a tube
amplifier power section, without the anemic flatness other amplifier designs can exhibit.
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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 recording
studio console or A/D 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
problems.
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TUNER OUTPUT – The SHUTTLE 6.2 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 Auxiliary 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. This input is a tip-ring-sleeve type jack with built-in summing resistors that sum left and right signals
when used with a stereo cable. This input will also work with a mono tip-sleeve plug. 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, harmonizers,
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.
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FOOT SWITCH – This connector is for connecting the optional 4 button foot switch to the SHUTTLE 6.2. Do not use
anything but the factory supplied foot switch. Model# F/S-STL.
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POWER AMPLIFIER – The SHUTTLE 6.2 uses a state of the art, Class D power amplifier design and a high frequency
switch-mode power supply (SMPS) 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 (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 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 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 filter components while increasing the performance by recharging the power supply
rails more often. The Class D amplifier uses digital PWM 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 an analog
to digital 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
proprietary 3DPM™ technology 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.
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FAN COOLING – The chassis is cooled via a thermal sensing fan design. The fan is always ON but will increase in
speed as demand on the amp increases. Do not obstruct the left or right chassis vents.
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SPEAKER OUTPUTS – The SHUTTLE 6.2 provides two Neutrik Speak-On™ connectors (wired 1+/1-). The speaker
jacks are paralleled. The minimum speaker load is 4 ohms. Do not ground either the “+” or the “-” outputs.
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POWER INPUT – VOLTAGE SELECTOR SWITCH - The SHUTTLE 6.2 utilizes rear panel switch selectable
universal power supply that operates from 100V to 240 volts, 50 to 60 Hz for world-wide use. Simply set the switch
to the appropriate AC mains voltage (BEFORE connecting to the power source), and utilize the proper IEC cord-set
appropriate for the country the product is being used.
For countries using 100V, 110V, 115V and 120V AC mains, select the 115V switch position on the Voltage Selector
switch.
For countries using 220V, 230V, and 240V AC mains, select the 230V switch position on the Voltage Selector switch.
There is no externally accessible AC mains (line) fuse. The internal fuse is integral to the SMPS power supply and is
not user serviceable. This fuse will not fail except under very unlikely fault conditions to the SMPS, and if this occurs a
qualified service technician is required to correct the problem.
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CHASSIS DESIGN – The SHUTTLE 6.2 ULTRA LIGHT DESIGN utilizes the highest quality aircraft grade, computer
machined aluminum chassis. To clean the amplifier, nothing more than a damp cloth and a little bit of glass cleaner
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(Glass Plus ) should be used.
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RACK MOUNTING – The SHUTTLE 6.2 is designed for optional rack mounting in a standard EIA style 19” equipment
rack or tour-case. Optional rack mounting kit is available from your dealer. Model# STL-RK.
GIG-BAG – A custom padded carry bag with shoulder strap is available as an optional accessory from your dealer.
Model# STL-BAG. This padded bag is ideal for convenient carrying of the amplifier. Do not operate the amplifier inside
the carry bag, as the chassis aluminum construction and cooling fan inlet vents are part of the amplifier’s cooling
mechanism.
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COMBO VERSIONS - REMOVABLE CHASSIS FEATURE—A unique element of the SHUTTLE 6.2 combo models
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is the ability to easily remove the amp “head” from its protective “saddle” and use the SHUTTLE amp with larger
enclosures for bigger venues.
Removal of the chassis is simple. We recommend first unplugging the speaker cable from the back of the chassis.
Step One:
• Unscrew the large thumbscrews on both sides of the
chassis’ saddle.
It is recommended to screw these back into the chassis
after the amp is removed, so they are not lost.
Step Two:
• After the thumbscrews are removed, gently slide the
chassis forward using both hands to move it forward in
the saddle.
Step Three:
• As the chassis appears from within the saddle, grab it from the front end and remove it completely from the
protective saddle.
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STL6-2-12T COMBO - This model produces 375 watts into the 8 ohm combo configuration and 600 watts when used
with an additional 8 ohm extension cabinet. It will be necessary to use a Neutrik Speak-On™ connection when using an
extension cabinet with this combo. The speaker is our proprietary high power GBE 12350, high energy 12” Neodymium
cast frame driver coupled with our GBE 4941 tweeter. A 100 watt tweeter level control is provided to adjust the output of
the tweeter.
STL6-2-210T COMBO -This larger model produces 375 watts into the 8 ohm combo configuration and 600 watts when
used with an additional 8 ohm extension cabinet. It will be necessary to use a Neutrik Speak-On™ connection when using
an extension cabinet with this combo. The combo is loaded with our proprietary high energy GBE 10300, 10” cast frame
Neodymium drivers coupled with our GBE 4941 tweeter. A 100 watt tweeter level control is provided to adjust the output of
the tweeter.
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STL-2-12T EXTENSION CABINET --- An 8 ohm extension cabinet is available for adding on to the SHUTTLE combo.
This model is the exact same cabinet configuration as the STL6-2-12T.
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STL-2-210T EXTENSION CABINET --- An 8 ohm extension cabinet is available for adding on to the SHUTTLE combo.
This model is the exact same cabinet configuration as the STL6-2-210T.
BLOCK DIAGRAM
Specifications
STL6-2
STL6-2-12T
STL6-2-210T
Rated Power: 375W/8ohms
600W/4ohms
Rated Power: 375W/8ohms
600W/4ohms
Rated Power: 375W/8ohms
600W/4ohms
Dimensions: 2.5”H X 10”W X 10.50”D
Weight: 3.75 LBS
Dimensions: 21.75”H X 18”W X 16”D
Weight: 32 LBS
Dimensions: 27.75”H X 18”W X 16”D
Weight: 43 LBS
SAFE OPERATING REQUIREMENTS:
• Never set an amplifier on anything that will tip over or collapse under its weight.
• Provide a minimum distance of 25.4 mm (1 inch) around all sides of the amplifier for sufficient ventilation. The
ventilation should not be impeded by covering the amplifier’s vent openings with items such as newspapers, tablecloths,
curtains, etc.
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• No naked flame sources, such as lighted candles, should be placed on the SHUTTLE 6.2 amplifier.
• This amplifier should not be exposed to dripping or splashing and no objects filled with liquids, such as vases or drinks,
should be placed on this product.
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• The SHUTTLE 6.2 amplifier should be connected to a mains socket outlet (power receptacle) with a protective earth
(ground) connection at all times.
• The amplifiers mains plug (power plug) is considered the disconnect device and the connection must remain accessible
at all times.
• This amplifier is capable of producing sound pressure levels that may cause hearing loss.
• There are no user serviceable parts and hazardous operating voltages are present inside this unit. Always consult a
qualified repair facility for service.
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WARNING!
• The use and operation of this device constitutes an agreement of full release of any and all liability connected with its
use. Only persons familiar with the operation of high-powered professional audio equipment should attempt to operate
this device.
• In addition, by use of this device, the user agrees to hold Genz Benz and its designers, sales agents and all other
affiliates and related parties harmless in the event of any accident, injury, damage, or loss resulting from such use.
• Manufacturer’s sole responsibility is to provide a warranty on the specified performance of the product under normal
operating conditions for a period of 3 years.
WARRANTY:
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• Genz Benz warrants the model SHUTTLE 6.2 to be free from defects in materials and workmanship for a period of 3
years from the date of purchase, when purchased from an authorized Genz Benz dealer.
• This warranty does not cover normal wear and tear incurred from the normally designed use of the product.
• This warranty is effective only if a copy of the original sales receipt is presented at the time of warranty service.
• This limited warranty is completely transferable to any subsequent buyer as long as the original sales receipt is also
transferred to such subsequent buyer.
• All warranty service must be performed by a Genz Benz authorized service center.
• Before returning any unit for service, a returned merchandise authorization number (RMA#) must be obtained by
calling 480-941-0705.
• This warranty is valid in the US & Canada only. For all products sold outside the USA, warranty is handled through our
international distributor for each country. For more information visit our website: www.GENZBENZ.com.
Declaration of Conformity
(89/336 EEC-EMC Directive)
Manufacturer’s Name:
Manufacturer’s Address:
Genz Benz, a division of KMC Music Corporation
7811 East Pierce Street
Scottsdale, AZ 85257, U.S.A.
Product Type:
Model Number:
Audio Amplifier
SHUTTLE 6.2 (all versions)
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Operating Power Condition:
Effective Date:
100/115/230/240 V, 50/60 Hz
01-01-2012
Conforms to the Following Standards: [X] EN 55013: 2001 + A1: 2003
[X] EN 55020: 2002 + A1: 2003
[X] EN 60065: 2001+ A1, A11, A12, A2
[X] IEC 61000-3.3: 1994 + A1: 2001
[X] IEC 61000-4.2
[X] IEC 61000-4.3
[X] IEC 61000-4.4
[X] FCC 15.107 and 15.109
[X] RoHS Directive 2002/95/EC
[X] WEEE Directive 2002/96/EC
[X] CE Mark LV Directive 73/23 EEC
7811 E. Pierce St. Scottsdale, AZ 85257
Ph: 480-941-0705 Fax: 480-946-2412
A KMC Music Corporation, Bloomfield, CT
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