Brax GRAPHIC GL6 MK2 – 165 mm High-End Mid-Woofer
The GL6 MK2 is the 6.5″ (165 mm) mid-woofer of the BRAX GRAPHIC series, a line dedicated to pure, uncoloured music reproduction using current technologies and top-grade materials. It follows Heinz Fischer’s aim of bringing high-end hi-fi quality into the car and is designed and made in Germany.
Its hand-scooped paper cone carries the patented MicroSphere coating: ceramic micro hollow spheres of 75 µm diameter embedded in a polymer layer, which add internal damping without adding mass and stiffen the cone for a more dynamic, accentuated performance. The MK2 version introduces a new soft polyurethane dust cap for a more balanced response and higher tonal neutrality.
Key Features
- MicroSphere-coated paper cone: hand-scooped, very stiff and light, with good impulse response and no coloration.
- Internal damping without extra mass: the ceramic micro hollow spheres damp the cone without increasing its weight.
- New polyurethane dust cap (MK2): optimises the upper-midrange response and tonal neutrality.
- 37 mm, 3-Ohm voice coil: with a precisely made magnet system for Thiele/Small parameters suited to impulse response and high efficiency.
- Shaped rubber surround: allows maximum linear cone excursion.
- Rigid die-cast aluminium basket: extremely stable chassis.
- Large pole-piece vent: minimises compression effects.
- Protective magnet cover: rugged cover with BRAX lettering.
- 24-carat gold-plated screw terminals: for minimal contact resistance.
- Serial-numbered pairs: recorded in a service database; made in Germany and supplied in a wooden box.
Drivers & Construction
The GL6 MK2 combines a 37 mm voice coil (14 mm winding height) with a powerful, precisely machined magnet system and a large pole-piece vent. The MicroSphere-coated paper cone has an effective area (Sd) of 139 cm² and a moving mass (Mms) of 15.3 g, suspended by a shaped rubber surround in a die-cast aluminium basket.
Acoustic Performance
- Power handling: 100 W RMS / 150 W max.
- Impedance: 3 Ohms (DC resistance 3.0 Ohms).
- Frequency response: 40–4,000 Hz.
- Sensitivity: 92 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m.
- T/S parameters: Fs 52 Hz, Qms 6.00, Qes 0.57, Qts 0.52, Vas 16.3 L, Cms 603 µm/N, BxL 5.2 Tm, Rms 0.84 kg/s.
- Max. linear excursion: ±4.0 mm.
Installation Notes
Outer diameter is 166 mm (6.5″), installation diameter 142 mm (5.6″) and installation depth 68.2 mm (2.7″). Recommended enclosures:
- Sealed box: 8 L net volume, lower limiting frequency (-3 dB) 69 Hz.
- Vented box: 15 L net volume, port diameter 60 mm (2.4″), port area 28 cm², port length 19 cm (7.5″), tuning frequency 45 Hz, lower limiting frequency (-3 dB) 48 Hz.
Technical Specifications
| Power handling RMS / max. | P | 100 / 150 Watts |
| Impedance | Z | 3 Ω |
| DC resistance | Re | 3.0 Ω |
| Frequency response | 40 Hz – 4,000 Hz | |
| Resonance frequency | Fs | 52 Hz |
| Mechanical Q factor | Qms | 6.00 |
| Electrical Q factor | Qes | 0.57 |
| Total Q factor | Qts | 0.52 |
| Compliance | Cms | 603 μm/N |
| Equivalent air volume | Vas | 16.3 L |
| Force factor | B*I | 5.2 Tm |
| Sensitivity | SPL | 92 dB @ 2.83V / 1m 88 dB @ 1W / 1m |
| Cone area | Sd | 139 cm² |
| Moving mass | Mms | 15.3 g |
| Cone material | Paper cone with “MicroSphere” coating consisting of micro ceramic hollow spheres embedded in a polymer layer | |
| Mechanical resistance | Rms | 0.84 kg/s |
| Voice coil diameter | ø | 37 mm |
| Voice coil winding height | 14 mm | |
| Max. linear excursion | Xmax | +/- 4.0 mm |
| Outer diameter | ø | 166 mm / 6.5″ |
| Installation diameter | ø | 142 mm / 5.6″ |
| Installation depth | 68.2 mm / 2.7″ | |
| Recommended enclosure volumes | ||
| Sealed box | ||
| Net volume | 8 L | |
| Lower limiting frequency (-3dB) | 69 Hz | |
| Vented box | ||
| Net volume | 15 L | |
| Port diameter | ø | 60 mm / 2.4″ |
| Port area | 28 cm² | |
| Port length | 19 cm / 7.5″ | |
| Port tuning frequency | Fb | 45 Hz |
| Lower limiting frequency (-3dB) | 48 Hz |
Scope of Delivery
2 x High-End Woofer BRAX GRAPHIC GL6 MK2
1 x Data sheet
