The C-12MB has been designed specifically for use as a mid basstransducer. This 12 inch (315mm) diameter driver has been optimized for use as either a direct radiator mid bass driver or for use in a hornloaded mid bass design. The Challenger series II C-12MB is optimized for a combination of low frequency response and efficiency. The C-12MB has been designed for maximum efficiency thru the operating range of 60Hz to 2000Hz. The frequency range of 120Hz to 2000Hz is the critical mid band range where vocal fundamentals as well as fundamentals of most musical instruments are found.This area is critical to system clarity and intelligibility and the C-12MB, with its newly developed highly damped cone material, is optimized. The large format 4 inch (101.6mm) voice coil diameter produces alarge cross sectional area for maximum heat transfer and power compression. The rectangular geometry voice coil provided a professional level of power handling and critical reliability. Like all models in the Challenger Series II, the C-12MB features a large diameter Ferrite based permanent magnet coupled to an aluminum die cast chassis. Because of its very high efficiency design, the C-12MB is designed for mid bass applications only. For system designs where additional bass is required the C-12MB is a superior choice.

GENERAL SPECIFICATIONS

Nominal Impedance 8 Ω
Power 800 Watt (rms)
SPL 1W@1M average sensitivity 96 dB
Frequency Response 60Hz - 2000Hz
Dimension Ø x H (cm) 31.5 x 15.9
Net Weight 11.7 kg (25.7 lbs)
Shipping Weight 12.9 kg (28.4 lbs)
Packing Dimension H x W x D (cm) 34.5 x 34.5 x 21.0 (0.9cu.ft)
13.6" x 13.6" x 8.3"

PHYSICAL SPECIFICATIONS

Magnet type Ferrite
Voice Coil Diameter 101.6 mm (4 inch)

THIELE/SMALL PARAMETERS

Resonance Frequency Fs 61 Hz
DC. Resistance Re 5.2 Ω
Coil Inductance Le 0.49 mH
Mechanical Q Factor Qms 7.10 Electrical
Q Factor Qes 0.45
Total Q Factor Qts 0.42
BL Product BL 21.37 Tm
Effective Moving Mass Mms 103.94 g
Equivalent Cas Air-Load Vas 28.73 Liters
Effective Piston Area Sd 0.0530 Sqm
Half-Space Efficiency Eff 1.37 %
Airgap Height Hag 10.0 mm
Voice Coil Height Hvc 20.0 mm
Voice Coil Overhang Xmax 5.0 mm

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