The low frequency Beyma 8G40 transducer is specially intended for the most demanding applications. Its design concept arises from the need of achieve a more resistant loudspeaker that matches the more and more power given by ultimate amplification systems. In order to accomplish that, almost every component of the speaker has been reconsidered: its voice coil has the benefits of an improved manufacturing process, made with the highest quality materials and the diaphragm has been carefully developed to give an extremely flat, smooth response. These characteristics make its integration in compact systems covering the low frequency range a straightforward task. Moreover, its parameters has been optimized to obtain an excellent bass response when used in small bass-reflex cabinets.
Product Features
High power handling (250 w AES )
2.5" (62.4 mm.) aluminium voice coil with polyimide fiber glass former
Optimum winding length for increased linear excursion
Designed for woofer applications
Voice coil: aluminium wire with high temperature bonding strength. Polyimide fiber glass former able to withstand high temperatures.
Cone: paper cone capable to endure the most extreme conditions.
Surround: treated cloth to assure good retaining of elasticity in despite of continuing use.
Spider: treated cotton fibres.
Metal parts: anti-corrosion coated back plate designed to resist aggressive environmental conditions.
Basket: specially designed die cast aluminium basket to avoid disturbing resonances.
Magnet: high Curie temperature ferrite.
Technical Specifications
Nominal diameter 200 mm. 8 in.
Rated Impedance 8 ohms
Power Capacity 250 W AES
Program Power 500 W
Sensitivity 95 dB 2.83v @ 1m @ 2π
Frequency range 65 - 6000 Hz
Recom. enclosure vol. 10 / 30 l 0.35 / 1.06 ft.3
Voice Coil Diameter 62.4 mm. 2.5 in
Magnetic assembly weight 3 kg. 6.6 lb.
BL Factor 12.2 N/A
Moving Mass 0.021 kg
Voice coil length 16 mm.
Air gap height 7 mm.
X damage (peak to peak) 23 mm.
Moutning Information
Overall Diameter 212 mm. 8.35 in
Depth 96 mm. 3.78 in
Baffle cutout dimensions
Bolt Circle Diameter 198 mm. 7.8 in
Net Weight 3.3 kg. 7.26 lb
Shipping Weight 3.45 kg. 7.6 lb
Volume displaced by driver 2 l 0.05 ft.3
Thiele-Small Parameters
Resonant frequency, fs 70 Hz
D.C. Voice coil resist ance, Re 6.1 ohms
Mechanical Quality Factor, Qms 6.83
Electrical Quality Factor, Qes 0.38
Total Quality Factor, Qts 0.36
Equivalent Air Volume to Cms, Vas 17 L
Mechanical Compliance, Cms 246 µm/N
Mechanical Resistance, Rms 1.4 kg/s
Efficiency, (%) 1.5
Effective Surface Area, Sd (m2) 0.0220 m2
Maximum Displacement, Xmax 4.5 mm.
Displacement Volume, Vd 99 cm3
Voice Coil Inductance, Le @ 1 kHz 1.3 mH