DUO SD G3 Series Horn Loudspeaker Pair

DUO SD G3 Series Horn Loudspeaker Pair Option A: Passive Nature Cap crossover  107 dB/18 OHM, 670MM HORN ACTIVE SUB DRIVER: 1 X 12” Speaker: 2 Way...

Brand Avantgarde
Type Speakers
Tags Speaker, Speakers

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  • DUO SD G3 Series Horn Loudspeaker Pair
  • DUO SD G3 Series Horn Loudspeaker Pair
  • DUO SD G3 Series Horn Loudspeaker Pair
  • DUO SD G3 Series Horn Loudspeaker Pair
  • DUO SD G3 Series Horn Loudspeaker Pair
  • DUO SD G3 Series Horn Loudspeaker Pair
  • DUO SD G3 Series Horn Loudspeaker Pair

AU $68,000

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**Conditions apply

DUO SD G3 Series Horn Loudspeaker Pair

Option A: Passive Nature Cap crossover 

107 dB/18 OHM, 670MM HORN


Speaker: 2 Way with 500W active DSP Sub suit rooms 24m2 to 44m2

Reduction does not always mean simply doing without. Reduction often means focusing on the essentials. Or simply: concentration. The DUO SD, with its single-drive bass unit, is the essence of what makes a speaker - the perfect introduction to the - classic sound - of the DUO range.



Driven by its impressive 670 mm spherical wave horn with a frequency response up to 170 Hz, the DUO is the epitome of performance and dynamic elegance. In the fascinating world of spherical wave horns, size is the defining criterion. The larger the horn, the deeper its lower bandwidth and the more the listener is drawn into the maelstrom of superior performance.

The Evolution XM2 midrange driver – a 170 mm chassis with a powerful Alnico magnet – is designed for a large linear diaphragm excursion. Its new ‘Soft Mesh Compound’ cone uses a robust mesh shell as the basis of its construction. The microscopic openings in the mesh are sealed with a damping elastomer coating. The combination of the strong mesh structure and the flexible coating creates a broadband absorption effect that effectively dampens partial vibrations of the diaphragm and thus unwanted harmonics.

The DUO SD uses the same XT3 tweeter as our flagship TRIO G3. The XT3’s lighter, annular diaphragm extends the frequency range up to 28,000 Hz with a sensitivity of 107dB/W/m, providing greater clarity, focus and a fuller, more natural sound.

The subwoofer uses the new high-performance XB12 driver in a bass-reflex configuration. We increased the voice coil diameter from 100mm to 153mm and this huge 6-inch motor structure achieves superior power factor and power handling. At the same time, thermal compression is significantly reduced.

The G3-500 bass amplifier delivers 500 watts and features an advanced digital sound processor. The new user interface makes it easy to adjust the sound to suit individual preferences and to integrate the system seamlessly into a wide variety of rooms.



Excellence reinvented. 
In the G3 Series, we have taken the bionic horn principle to the extreme. Highly bred horn performance through unrestrained efficiency with a huge transmission range.

107dB Efficiency

New Evolution driver generation for enhanced dynamics and purer sound.

200 mm - Supertweeter

Innovative XT3 tweeter with new long-throw horn and extended supertweeter frequency range with record-low distortion levels.

670 mm spherical wave midrange horn

New improved XM2 DUO Evolution driver with 107dB efficiency and 18 Ohm Omega technology.


One 12" XB12 driver with 153mm voice coil and 1.15 Tesla flux density over 480mm voice coil length. Diaphragm composite of long fibre paper and carbon fibre.

Color worlds. 

New elegant color and design options for an even more customized configuration of your dream speaker.

Coplanar driver alignment.

In the G3 Series, all drivers are on one axis. This means that the acoustic centers are all on the same plane. The distance of the acoustic centers of the drivers to the listener are therefore always identical. Accordingly, the signals from the respective sources (tweeter, midrange and woofer) arrive at the same time and thus correctly.

Modular technology.

All the electronics are housed in easily replaceable technology modules. So that you can easily expand or upgrade your system even after many years.

Current amplifier.

Patented iTRON current fully active engine for perfect control of membrane vibrations and the ultimate sound.

500 watt bass power amplifier

Integrated power amplifier with 500 watts of amplification power and processor-controlled active filters. New G3 user interface for programming. 


Each model has a replaceable technology module that connects to the loudspeaker via a multi-pin power connector. This makes it easy to upgrade the semi-active speaker with iTRON technology at a later date.

It can be upgraded to the most advanced digital technology available at the time, even after many years.

This ensures the sustainability of your investment for generations to come.


    Everything is possible ~ CUSTOMIZATION

    Each shade in our 12-colour collection has been carefully selected to complement and adorn your horn speakers. Our aim is to create a timelessly elegant and expressive composition that blends harmoniously with your interior design and showcases the horns.


    Coplanar alignment of the drivers.

    In the speaker, all the drivers are on the same axis. This means that the acoustic centres are all in the same plane. The distance between the acoustic centres of the drivers and the listener is therefore always identical.



    200mm tweeter horn

    • Lower cut-off frequency with substantially increased acoustic power
    • Redesigned smaller and lighter membrane
    • Linear phase response less than 50 degrees deviation (4,000 - 20,000 Hz)
    • 28,000 Hz cut-off frequency

    Midrange Driver

    670mm spherical wave horn

    • Ultra-low compression ratio
    • Large linear stroke
    • 27 Ohm driver impedance
    • Unique spheric-dome diaphragm with exclusive AirGate frequency filtering technology
    • 107dB/W/m sound pressure level


    The perfect crossover.

    With our SphericLowCut filter, Airgate technology and PolarizationPlus circuit, we have developed the most innovative technological concepts in our passive crossover.

    These are completed with the highest quality components available. Our new NatureCap is an extremely complex capacitor, handmade in Germany. The electrodes are made from precision-rolled aluminium foil, rather than ultra-thin plastic film vaporized with aluminium. The dielectric is a cellulose fibre compound impregnated with organic oils. The NatureCap is approximately 25 times larger than the previous XD series capacitors and is securely mounted to the circuit board using specially manufactured brackets.


    XB12 bass driver

    For the DUO SD we have developed a completely new drive. Compared to the previous model, we have increased the voice coil from 100mm to 153mm. With this gigantic 6 inch motor structure we achieve absolute top values for the power factor and the power handling, while reducing the power compression.

    The motor structure consists of two High Grade magnets magnetised in Europe’s largest 200,000-volt facility. The huge voice coil transfers the power of the permanent magnet with 1.15 Tesla flux density to a voice coil circumference of 480mm. This is an increase of over 50% compared to the previous model!

    We use low carbon steel for the pole plates, which are specially designed for the XB12. To ensure high linearity even at maximum diaphragm excursion, the spider has a patented dynamic profile with a progressive surround design. The surround is made of low-loss NBR (Acrylonitrile Butadiene Rubber) for fast and clean transient response.

    The diaphragm is made from a composite of long-fibre paper and carbon fibre – extremely strong and torsion resistant for precise pistonic excursion of the diaphragm during transients and decay.

    The XB12’s new SingleFrame chassis features robust die-cast aluminium cantilevers, which also enclose the magnet, providing a totally rigid material bond around the moving parts of the motor structure.

    The XB12 is our reference in terms of bass. A statement that underlines the uncompromising and unique nature of the G3 Series.


    Bass amplifier

    The DUO SD’s active subwoofer is powered by the G3-500 power module. This integrated power amplifier consists of a 500-watt amplifier that provides ample headroom for complex EQ settings.

    The subwoofer can be switched on remotely via a 12-volt switching input. Direct connection to integrated amplifiers, power amplifiers or receivers is via speaker-level input terminals. Alternatively, line level inputs are available via XLR connectors. The signal tap is not only high impedance, but also balanced and transformer-coupled. This keeps the circuit ground floating, eliminating hum and making it easy to connect to balanced and bridged amplifier designs.

    All electronics are fused via a state-of-the-art E-Fuse circuit. Not only is this much faster and safer than conventional fuses, but it is also ideal in terms of sound.


    Digital crossover - EVERYTHING UNDER CONTROL.

    The bass power amplifier is equipped with an advanced digital sound processor.

    The digital crossover eliminates all passive filter elements in the signal path with a precision and bit accuracy that cannot be achieved with analogue technology.

    The volume of the subwoofer can be adjusted using the two buttons on the DSP display.

    The Avantgarde Control Software allows a wide range of additional settings (e.g. high and low pass filters, equalisers, etc.) to be programmed. The DSP has 2 x LAN sockets, allowing multiple subwoofers to be daisy-chained for simultaneous programming. A USB connection is optionally available.

    The user interface has been completely redesigned and is now very easy and intuitive to use. All parameters can be easily adjusted to suit the room acoustics or listening habits.

    The BASS-BOOST control can be used to boost the low-frequency response below 45 Hz, allowing the bass response to be adjusted from ‘linear’ to ‘rich’.

    The DSP has an 8-band equaliser for individual frequency adjustment. Each of the 8 bands can be raised or reduced by up to 4 dB. This can be used to adjust the bass response to suit a particular sound (linear, techno, pop, rock, classical, etc.) or to reduce certain broadband room resonances.

    The LPF-RANGE slider adjusts the upper crossover frequency of the subwoofer and thus the “tonal balance” of the system.

    At higher frequency settings, the subwoofer partially overlaps with the midrange horn’s frequency response. This makes vocals/instruments sound ‘warmer’ and ‘fuller’.

    When the crossover frequency is set lower, there is a small gap between the subwoofer and midrange frequency response. The tonal balance of the system shifts towards a more ‘dynamic & punchy’ sound.

    FILTER 1 & 2 are narrow band ‘notch’ filters with a level cut of -3dB or -6dB. These filters can be used to eliminate/reduce unwanted narrowband room resonance frequencies.


    Frequency range satellite
    170-28,000 Hz
    Frequency range subwoofer
    18-350 Hz
    Power handling
    100 Watt
    Sensitivity (1 Watt/1 m)
    > 107 dB
    Crossover frequencies
    170/3,500 Hz
    Nominal impedance
    18 Ohm
    Recommended amplifier power
    > 10 Watt
    Recommended room size
    > 20 sqm
    Coplanar driver alignment
    NatureCap incl. PolarizationPlus circuitry


    Horn type
    spherical horn
    Horn aperture angle
    180 degrees
    Horn diameter midrange
    670 mm
    Horn diameter tweeter
    200 mm

    Diameter midrange
    170 mm / 7 inches
    Diameter tweeter
    25 mm / 1 inch


    Driver size
    300 mm / 12 inches
    Number of drivers
    1 x XB12
    Voice coil diameter
    153 mm
    Flux density
    1.15 Tesla / 480 mm
    Pole plate
    low carbon steel
    Membrane material
    Paper/carbon fiber compound


    Output power (RMS)
    1 x 500 Watt
    Digital crossover
    8 BAND EQ
    Digital room adjustment
    1 x SPKR + 1 x XLR 

    iTRON (Optional) 

    iTRON voltage/current converter technology
    Fully balanced circuit
    Single-ended circuit
    Zero feedback
    Without negative feedback
    2 x 100 Watt


    High Performance Multi Contact Connector
    Semi-active version
    Fully active version with iTRON amplifier

    Physical Attributes

    Dimensions width
    670 mm
    Dimensions depth
    652 mm
    Dimensions height (+/- 10 mm)
    1,552 mm
    94.0 kg


    G3 stands for “Generation 3”, the successor and next step up from the Avantgarde Acoustic XD series. Starting with the original Generation 1 models in 1993, this is the second time in thirty years that the German horn manufacturer has completely renewed their products and technologies. One of the standout new technologies of this new generation is the iTRON (optional) fully active modules, an option that turns the speakers into High End plug and play systems.


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