Børresen M1

Børresen M1 - Ultra high-end compact speaker with a huge soundstage

Børresen M1 is the absolute high-end version of a speaker that incorporates all the premium elements from the most innovative and advanced audio technologies represented by Ansuz, Aavik, and Børresen alike. The performance of the M1 speaker makes it necessary to redefine the quality of absolute high-end music reproduction.

In designing the Børresen M speaker series, the overall goal was to challenge existing technological limitations and pioneer into new and unconventional areas of audio technology. This includes the entirely new design of speaker components, finding effective ways to combat resonance and vibrations, and searching for materials that provide the ultimate properties to elevate sound quality to unprecedented new levels.

3D-printed basket in zirconium

The M1 speaker's basket is a true revolution – it is a topology-optimized 3D-printed basket made of zirconium, ensuring maximum rigidity and therefore minimum vibration and resonance. The basket is not merely a holder for the diaphragm, because the energy generated by the diaphragm is also carried by the structure behind it. The goal was therefore to eliminate noise from the basket by designing a basket with maximum rigidity. Studies were carried out using computer-optimized finite element design, resulting in a topology-optimized 3D-printed basket made of exclusive zirconium.

Børresen has not only designed a basket with extreme rigidity - they have also added important factors such as enormous internal damping and resonance control, resulting in extreme clarity in overall performance. Thanks to the 3D printing process, the cavities are filled with zirconium powder, which gives the basket additional damping properties. Zirconium is by far the best choice of material, as it allows the basket to generate an incredibly natural sound.

A bass/midrange diaphragm with maximum rigidity and minimal noise

The diaphragm is designed to achieve maximum rigidity with minimal noise. The diaphragm for M1 is the most advanced and sophisticated speaker diaphragm on the market. The M1 diaphragm has the highest rigidity and the lowest diaphragm resonance. The technological requirements for this unrivaled, world-class diaphragm 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 achieved their uncompromising goal of ultimate diaphragm performance for unprecedented sound quality.

The result is a diaphragm consisting of four layers of laminates in a single unit: two layers of spread tow carbon fiber, a layer of aramid honeycomb in between, and a titanium layer with Ansuz Supreme coating.

The combination of all these materials gives this state-of-the-art diaphragm its unique properties. Spread tow carbon fiber is designed to ensure a skin with optimal rigidity in many different directions. This unique characteristic reduces sound-disturbing vibrations and resonances to an unprecedented low level. This also applies to resonances in the frequency range above 8 kHz. Since the diaphragm/speaker is used up to the 2.5 kHz range, disturbing resonances have been moved two octaves outside the effective frequency range, ensuring an absolute minimum of resonances. 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 from the diaphragm. With the Ansuz Supreme coating, the diaphragm skin 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 chromium nitride. This coating gives the music truly impeccable sound quality.

An iron-free magnet system with silver

The patented Børresen iron-free magnetic system has been further refined. Børresen uses iron-free drivers in all its speakers. Their inductance is approximately ten times lower than that of conventional drivers. This extremely low inductance has now been further reduced to an unprecedented new minimum level – approximately 12 times lower than the inductance level of conventional iron-based drivers. This is because silver has 6-8% better conductivity than copper, and Børresen has replaced the copper pole rings with in-house manufactured handcrafted silver rings.

To take full advantage of all the performance-enhancing sonic properties of the Børresen M series, all other metal parts of these premium speakers also undergo cryogenic treatment. This reduces their inductance by a further 6-8%. The result is complete musical purity. With their unadulterated authenticity of music reproduction, these premium speakers set a new and unmatched standard – clarity, refinement, and imaging at its absolute best.

Cryogenically treated for enormous improvement

Cryogenic treatment of all metal parts of the speaker results in a further significant improvement in conductivity – thereby releasing the finest and most subtle musical details. When metal parts undergo cryogenic treatment, they are exposed to extreme cooling. In the wake of this process, the metal structure contracts more and more. Alloying elements are pushed out of the grain structure of the metal, which now becomes much more like a monocrystal. These structural changes in metal have a profound effect on its sonic properties, resulting in an increase in conductivity of 6-8%.

All metal parts of these speaker series undergo cryogenic treatment. The cryogenic treatment cycle requires a time window of 3 days. Within the first 24 hours, the metal undergoes a cooling process from room temperature to cryogenic temperatures. During the next 24 hours, the metal parts are kept at temperatures around -196°C (-321°F) before the temperature, within the following 24 hours, gradually returns to room temperature. The gradual cooling and heating are crucial to avoid thermal stress. The process strengthens and compresses the grain structure of the metal parts and reduces the inherent residual stress that occurs when metal solidifies from its liquid phase to a solid phase.

Børresen tweeter with extraordinary efficiency

Elaborate finite element methods have been applied to linearize and optimize the magnetic flux field, to facilitate the driver's movement and ensure high efficiency and exceptional linearity.

The efficiency of this closed ribbon tweeter amounts to an extraordinary 94dB and operates from approximately 2.5 kHz and up. The moving mass is extremely low at 0.01 gram. The fully concealed tweeter has the capacity to work at incredible speed, which is an absolute prerequisite for unlocking the most subtle and refined sonic details from any kind of music. The enormous robustness of this tweeter allows it to handle extremely high transient peaks without any ear-fatiguing interruptions. No transformers are used.

Series connection for a coherent system

Børresen speakers are equipped with a series connection configuration. The reason for this is that drivers share the same flow of electrical current in the crossover region. As a result, the electrical current is phase-locked across the crossover region. In contrast to standard parallel filtering, where each driver receives its own frequency and phase content, the new series filters work by redirecting out-of-band currents around the current flows, creating a much more coherent system. This unrivaled and innovative technological approach takes your music to a new echelon of acoustic pleasure.

For the crossover filter, Børresen has also gone to great lengths to find the best and most sophisticated state-of-the-art components. The coils are foil types wound with paper insulation and impregnated with resin under vacuum to make them mechanically extremely solid and stable.

For crossover capacitors, several arrays of small military-spec stacked-foil types have been used. They have the best mechanical stability and lowest induction of any type of capacitor on the market (and they also sound wonderful). For tweeter damping resistors, metal-strip types are used, as they have by far the lowest noise figures and additionally very low thermal variation.

A redesigned and reinforced cabinet

The design is an evolution and optimization of the fantastic Børresen 01 cabinet. To ensure even higher performance, the M1 cabinet is constructed with an additional 5 mm of reinforced, block-milled, compressed wood structures. In addition, braces are built into the sides of the speaker to give the cabinet even more rigidity and mechanical stability. The tweeter and woofer sections are equipped with matched terminals to ensure the highest efficiency. The cabinet is finished in black piano lacquer.

M1 stand – Aesthetics with sonic potential

The stand for the M1 speaker was designed with auditory functionality in mind to ensure the impressive performance of this world-class speaker. The speaker is placed on the carefully machined top plate, which is constructed as a sandwich solution. The base material is a heavy, compact laminate panel with titanium layers on top and bottom. This unique sandwich construction supports a natural and organic sound.

Three Ansuz Darkz Z2S resonance control decouplers are placed almost invisibly between the speaker and the top plate. Darkz Z2S is made of zirconium and represents the flagship version among the resonance control decouplers.

Ansuz Darkz Z2S - Invisible Resonance Control

With Ansuz Darkz Z2S, Børresen M1 has built-in advanced resonance control decouplers that ensure superior mechanical anchoring of the speaker to the stand or floor. These decouplers absorb unwanted vibrations that are not directly related to the audio signal, resulting in cleaner and more authentic sound quality.

Internally wired with Ansuz Gold Signature

M1 is equipped with Ansuz Gold Signature cables, representing the very best in audio cable technology. These cables ensure extremely clear, natural, and authentic sound reproduction that lets you hear every single nuance of your music.

Tesla Coil principle

Børresen M1 uses Tesla Coil technology, which eliminates noise and improves musical clarity. This advanced technology works by generating opposing voltages to neutralize noise, resulting in markedly improved sound reproduction.

Active Square Tesla Coils

With active square Tesla coils integrated into the circuit boards, M1 achieves impressive noise reduction, ensuring cleaner and more precise sound reproduction.

Analog Dither Technology 3rd Generation

The third generation of Ansuz analog dither technology ensures an even greater improvement in sound quality by amplifying the musical signal and reducing background noise, delivering an even more detailed and open sound experience.

Anti Aerial Resonance Coil Technology

M1 is equipped with Anti Aerial Resonance Coil Technology, which effectively eliminates airborne noise and ensures clean signal transmission without interference.