Brax GRAPHIC GL3 MK2

Brax GRAPHIC GL3 MK2 – 80 mm High-End Midrange Speaker

The GL3 MK2 is the 3.15″ (80 mm) midrange driver of the BRAX GRAPHIC series. Combined with the GL1 MK2 tweeter and the GL6 MK2 mid-woofer it completes a three-way GRAPHIC system, and it is designed for a lively, dynamic sound over a particularly wide frequency range. Like the entire series, it is made in Germany.

The cone is a light paper cone with a modified version of the patented MicroSphere coating, in which ceramic micro hollow spheres of 75 µm diameter are embedded in a polymer layer. The MK2 update adds a new, very soft polyurethane dust cap for a more balanced upper midrange and greater tonal neutrality. The cone is driven by a linear push-pull neodymium motor in an aerodynamically shaped die-cast aluminium basket.

Key Features

• MicroSphere-coated paper cone: patented coating of 75 µm ceramic micro hollow spheres in a polymer layer, giving a very stiff yet light cone.
• New polyurethane dust cap (MK2): very soft material for a more balanced upper-midrange response and higher tonal neutrality.
• Push-pull neodymium magnet system: ultra-precisely machined and vented for high magnetic flux linearity.
• Long-stroke voice coil with ventilation: thermal stability that prevents compression effects.
• Soft, low-reflection rubber surround: smooth high-frequency roll-off and a very low resonance frequency (Fs 80 Hz).
• Low crossover possible: the low resonance allows low crossover points, particularly in fully active systems.
• Aerodynamic die-cast aluminium basket: with optimised voice coil ventilation.
• Wide bandwidth: 250–8,000 Hz frequency response.
• Optional MR3 ring: the solid stainless steel BRAX MR3 can act as mounting ring or grille support ring depending on the installation position.
• Serial-numbered pairs: recorded in a service database; supplied in an elegant wooden box.

Drivers & Construction

The GL3 MK2 uses a 25 mm (1″) voice coil with 6 mm winding height in a push-pull neodymium motor. The MicroSphere-coated paper cone has an effective area (Sd) of 35 cm² and a moving mass (Mms) of 3.4 g, with a soft rubber surround, polyurethane dust cap and aerodynamically shaped die-cast aluminium basket.

Acoustic Performance

• Power handling: 100 W RMS / 150 W max. (with high-pass above 300 Hz, 24 dB/oct.).
• Impedance: 3 Ohms (DC resistance 2.9 Ohms).
• Frequency response: 250–8,000 Hz.
• Sensitivity: 91 dB @ 2.83 V; 87 dB @ 1 W / 1 m.
• T/S parameters: Fs 80 Hz, Qms 2.90, Qes 0.29, Qts 0.26, Vas 1.95 L, Cms 1180 µm/N, BxL 4.1 Tm, Rms 0.62 kg/s.
• Max. linear excursion: ±1.5 mm.

Installation Notes

Outer diameter is 92 mm (3.6″), installation diameter 76 mm (3.0″) and installation depth 35.5 mm (1.4″). BRAX recommends a sealed enclosure of at least 250 ml net volume, always filled with suitable damping material:

• 0.4 L: system resonance 200 Hz; crossover 350 Hz, min. 12 dB/oct.
• 0.8 L: system resonance 155 Hz; crossover 300 Hz, min. 12 dB/oct.
• 1.2 L: system resonance 140 Hz; crossover 250 Hz, min. 24 dB/oct.

Technical Specifications

Note: The enclosure should always be filled with appropriate damping material.

Scope of Delivery

2 x High-End Cone Midrange Speaker BRAX GRAPHIC GL3 MK2
1 x Allen key
1 x Data sheet