Reduction does not always mean just leaving out. Reduction often means creating awareness for the essentials. Or simply: concentration. The DUO SD with single drive bass unit is the concentrate of what makes a speaker the perfect entry into the ‘classic sound’ of the DUO series.



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. Because in the captivating world of spherical wave horns, size is the defining criterion. The larger the dimensions of the horn, the deeper its lower bandwidth and the more the listener enters 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” diaphragm uses a sturdy mesh carcass as the basis of its construction. The microscopic openings of the mesh are sealed with a damping elastomer coating. The combination of the rigid mesh structure with flexible lining develops a broadband absorption effect that effectively dampens partial vibrations of the diaphragm and thus unwanted harmonics.

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

In the subwoofer, we use the new high-performance XB12 driver in a bass-reflex configuration. We have increased the voice coil from 100 mm of the previous model to 153 mm. This gigantic motor structure with a diameter of 6 inches achieves superior values of power factor and power handling. At the same time, thermal compression is significantly reduced.

The G3-500 bass amplifier has 500 watts and is equipped with an advanced digital sound processor. The new user interface allows easy adjustment of the sound to individual preferences and seamless integration of the system in a wide variety of rooms.

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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 extended dynamics and even purer sound.

200 mm - Supertweeter

Innovative XT3 tweeter unit with new Long Throw Horn and extended Supertweeter frequency range with record low distortion values.

670 mm Medium tone spherical wave horn

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



Once 12 inch XB12 driver with 153mm voice coil and 1.15 Tesla flux density on 480mm voice coil length. Diaphragm composite of long fiber paper and carbon fiber.

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.

Everything is possible
Each shade in our 12-color collection has been carefully selected by us to adorn your horn speakers. Our claim is that the shades are both timelessly elegant and expressive, integrating harmoniously into your interior design and showcasing the horns.

One speaker. Two version.


The passive version is designed for operation with external HiFi amplifiers.
With 109 dB efficiency and 27 ohms impedance, the speaker is extremely easy to operate and ideally suited even for low-power amplifiers. The ideal speaker for the best high end amplifiers in the world.


In the ITRON version, the amplifiers are built into the speaker and no additional external power amplifiers are needed. For this purpose we have developed integrated electronics based on fundamentally different electro-physical laws than any other amplifier on the market. We have thus succeeded – as the first manufacturer worldwide – in making the technological approach of the current amplifier, which was previously considered technologically unmanageable, work. For a sound that sounds simply heavenly.

Module technology for diversity & timelessness.

Each model has a replaceable technology module that is connected to the speaker via a multi-pin power connector. It is therefore easy to upgrade the passive loudspeaker with ITRON technology or with the wireless module.

Even after many years, it is possible to upgrade to the most modern digital technology available at that time.

For a convincing sustainability of your investment – for generations to come.

Coplanar alignment of the drivers.

Im Lautsprecher befinden sich alle Treiber auf einer Achse. Das bedeutet, dass die akustischen Zentren alle in der gleichen Ebene liegen. Der Abstand der akustischen Zentren der Treiber zum Hörer ist daher immer identisch.


200mm tweeter horn
  • Lower cut-off frequency with substantially increased acoustic power
  • Smaller and lighter membrane
  • Linear phase response less than 50 degrees (4,000 - 20,000 Hz)
  • 28,000 vibrations per second

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 intricately designed capacitor, handmade in Germany. Instead of using ultra-thin plastic foils vaporized with aluminum, the electrodes are made of precisely rolled aluminum foil. As dielectric we use a cellulose fiber compound impregnated by biological oils. The NatureCap is approx. 25 x larger than the capacitors from the XD series and is stably attached to the circuit board via 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 power handling, while reducing the power compression.

The motor structure consists of two high-grade magnets magnetized in Europe’s largest 200,000 volt facility. Due to the huge voice coil, the force of the permanent magnet with 1.15 Tesla flux density is transmitted 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 specially designed for the XB12. To ensure high linearity even at maximum excursion of the diaphragm, the centering has a patented dynamic profile with progressive design of the surround. The surround is made of low-loss NBR (acrylonitrile butadiene rubber) for fast and clean transient response.

The diaphragm is made of a composite of long-fiber paper and carbon fiber – extremely strong and torsionally stiff for precise pistonic excursion of the diaphragm during transient and decay events.

The XB12’s new SingleFrame chassis has robust die-cast aluminum cantilevers that also enclose the magnet, for a completely stable composite of materials around the moving components of the motor structure.

The XB12 is our reference in terms of bass. A statement that underlines the uncompromising and uniqueness 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 even with complex EQ settings.

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

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

Digital crossover.


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

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

The subwoofer volume is adjusted via two buttons on the DSP display.

Extensive additional settings (e.g. high and low pass filters, equalizers etc.) can be programmed with the Avantgarde Control Software. For this purpose, the DSP has 2 x LAN sockets, which allow daisy-chaining and thus programming of several subwoofers simultaneously. A USB connection is optionally available.

The user interface has been completely revised and now allows a very simple intuitive use by the customer. Thus, all parameters can be easily adjusted to the room acoustics or listening habits.

The BASS-BOOST control can be used to boost the low frequency response below 45 Hz and thus adjust the bass response from “linear” to “fat”.

For individual frequency adjustments, the DSP has an 8-band equalizer. Each of the 8 x bands can be boosted or cut by up to 4 dB. In this way, the bass response can be adapted to certain sounds (linear, techno, disco, pop, etc.) or some broadband room resonances can be reduced.

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

With higher frequency, the subwoofer partially overlaps with the frequency response of the midrange horn. This makes the sound character of voices / instruments “warmer” and “fuller”.

When the crossover frequency is set to a lower frequency, the subwoofer and midrange frequency response have a small gap. 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 resonant frequencies of the room.


Frequency range satellite 170-28.000 Hz
Frequency range subwoofer 18-350 Hz
Load capacity 100 Watt
Efficiency (1Watt/1m) > 107 dB
Crossover frequencies 170/3.500 Hz
Nominal impedance 18 Ohm
Recommended amplifier power > 10 Watt
Recommended room size > 20 qm
Coplanar driver alignment Ja
OmegaDrive Ja
AirGate Ja
NatureCap incl. PolarizationPlus circuitry Ja


PDF documents
DUO SD Brochure
DUO SD Operating Instructions
Test listening
Experience the incomparable Avantgarde sound.

To provide you with a suitable place for this encounter, we have created our showroom. All our loudspeakers are ready for demonstration and can be heard in mutual comparison. Operated with classic voltage amplifiers or also gladly via our switching system in comparison with the unique iTRON electronics.

At the dealer

In the showroom

Our partner stores
What does Avantgarde Acoustic sound like?

Unique and incomparable. Magically captivating. Dynamically three-dimensional. Powerful and intense. Lets you experience music in a new way. Simply perfect – for every style of music.

Let our trade partners surprise you and advise you competently. Since we want to take the time you deserve, we ask you to make an appointment in advance. Our sound experts are looking forward to your visit.

Agentur Tur-Pex Oy Ltd
Lundberg Jan
Agentur Tur-Pex Oy Ltd
Lundberg Jan
American Sound of Canada Inc.
Lisi Angela
American Sound of Canada Inc.
Lisi Angela
United States
Analogue Beat
Al Rashid Harun
Audio Note S`pore Pte Ltd.
Poon Desmond
Audio Soul Ultra
Kopsaftopoulos George
Audio Trading UK LTD
Gimenez Georg
United Kingdom
Auditorium Hamburg
Wagner Jan
Poggenmühle 1
20457 Hamburg
Auditorium Hamm
Schwarte Sebastian
Feidikstraße 93
59065 Hamm
Auditorium Münster
Kropp Matthias
Alter Steinweg 22-24
48143 Münster
Seiffert Jörg
Rüttenscheider Straße 176
45131 Essen
Centre Circle Audio & Visual
Chia Nelson
Kuala Lumpur
Dong Thanh - Hoa Phuc Company Limited
Shing Chan Ka
Machida Hiroyuki
Polyakov Yury
Hi-Fi Center AS
Tømmervik Geir
HiFi Profis Frankfurt
Schmid Ernst
Große Friedberger Straße 23-27
60313 Frankfurt am Main
Hifi-Studio Wittmann, Isny
Wittmann Oliver
Allmisried 3
88316 Isny im Allgäu
Hifi-Studio Wittmann, Stuttgart
Nolden Markus
Brucknerstraße 17
70195 Stuttgart
High End Center
Asté Thierry
High Fidelity Italia srl
Faccendini Alessandro
High-Performance Audio ApS
Eskildsen Morten
IP "HI-FI Studio"
Tavdishvili Alan
Life Like
Pech Wolfgang
Oberföhringer Straße 107
81925 München
Maxmedia Pty. Ltd.
Keating Cameron
Nautilus Poland
Szklarz Robert
Rheinklang Hifi
Rzymbowski Michael
Olpener Straße 955
51109 Köln
SABO Audio
Shavit Ran
Tel Mond
Shanghai Shengjing International Trade Co. Ltd.
Sons de Requinte LDA
Carvalho Miguel
Sound Heaven
Gassmann Klaus
Pleikartsförster Hof 4/1
69124 Heidelberg
Gourdain François
Sei Hoon Jo
South Korea
Ultimate Audio Video
Lim Agus Santosa
Winkey Electric Co., Ltd.
Chou Ariel
X-fi audio import
Bunge Caspar

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