BORRESEN M3

Elegant design and outstanding audio
The M3 speakers are the perfect blend of form and function, which reflects the excellent and highly productive partnership between two great minds in the audio industry – Michael Børresen and Flemming Erik Rasmussen. The sleek and elegant design of these speakers, combined with their outstanding audio performance, makes them a testament to Audio Group Denmark’s commitment to audio excellence.
The basket – A real revolution
Zirconium, topology-optimized
This basket is a real revolution – it is a topology-optimized basket made of zirconium, which ensures maximum rigidity and thus minimum vibration and resonance. Zirconium is by far the best choice of material, since it allows the basket to generate an inconceivable quality of natural sound.

This basket is not just a placeholder for the membrane. The energy generated by the membrane is also held by the structure behind it. The goal was therefore to eliminate the noise of the basket by designing a basket with maximum stiffness. Studies were conducted using computer-optimized finite element designs, resulting in a topology-optimized basket made of the exclusive material zirconium.

Børresen has not only designed a basket with extreme stiffness, but also added important factors such as tremendous internal damping and resonance control, resulting in extreme clarity in overall performance.
M series membrane – Bass/midrange
Børresen IronFree5 Zirconium SSE driver
The membrane is designed to achieve maximum stiffness with minimum noise. The membrane for the M-Series speakers are the most advanced and sophisticated speaker membrane on the market. The membrane has the highest stiffness and the lowest membrane resonance. The technological requirements for this unrivalled, world-class membrane performance made it necessary to design, develop and assemble all components in-house. Michael Børresen and his team had to construct a large number of different variants and models until they accomplished their uncompromising goal of ultimate membrane performance for an unprecedented sound quality.

The result is a membrane that consists of four skins laminated into a single unit: two layers of spread tow carbon fiber, a layer of aramid honeycomb spacers in between, and a titanium skin with Ansuz Supreme coating.

The combination of all these materials give this state-of-the- art membrane its unique properties. Spread tow carbon fiber is designed to ensure a skin with optimum stiffness in many different directions. This unique characteristic reduces sound disturbing vibrations and resonances to an unprecedentedly low level. This is also true for resonances in the frequency range above 8 kHz. Since the membrane/driver is used up to the 2.5 kHz range, disturbing resonances have been shifted two octaves outside the effective frequency range, ensuring an absolute minimum of resonances.

The aramid honeycomb also has the best stiffness to weight ratio in the vertical direction.

Titanium has perfect resonance control properties and supports a natural, organic sound of the membrane. With the Ansuz Supreme coating, the skin of the membrane is further acoustically optimized. This coating is applied to the titanium skin in a Hi-PIMS (High Power Impulse Magnetron Sputtering) machine to create the finest and most uniform layer of zirconium, followed by a layer of tungsten and finished with a layer of aluminum chrome nitride. This coating provides the music with a truly impeccable sound quality.
Magnet system – Bass/midrange
Børresen IronFree5 Zirconium SSE driver
The patented Børresen iron-free magnetic system has been further refined, and is used in all loudspeakers in the M-series. Their inductance is about ten times lower than that of conventional drivers. This exceptionally low inductance has now been even further reduced to an unprecedented new minimum level – about 12 times lower than the inductance level of conventional, iron-based drivers. Here is how we achieved this: Since silver has 6-8% better conductivity than copper, we replaced the copper pole rings with in-house manufactured, handcrafted silver rings.
Internal M cabinet – Enhances the balance
Special designed bass/midrange driver ventilation thatprovideslow compression insuring fast and agile speaker driver. Furthermore it is designed with bass reflex sections for bass drivers, leading to a dynamic and harmonious balance between midrange and bass.
Active square Tesla coils
Impressive noise reduction.
The active square Tesla coils are embedded in our circuitry boards – one coil on the top and the counter coil on the rear side. The principle is exactly the same as the active Tesla coil and thus a great ability to eliminate noise than the passive Tesla coils.
Anti aerial resonance coil technology
Prevents airborne noise.
All cables and cable screens are acting like antennas for airborne RF noise which of course is a huge problem. The passive cable Tesla coil is wounded on the external part of the cable and protects the signal from absorbing the airborne RF noise. This noise is absorbed in the Tesla coil.

As there is a voltage running in the conductor itself, and it is wounded in the counter direction – this is used as the counter coil and the RF noise is then eliminated.