The C-12LF is a very efficient full range transducer designed for use in two way and three way sound reinforcement and public address systems. The C-12LF is a 12 inch (315mm) diameter driver that features a large Ferrite based permanent magnet and a light weight die cast aluminum chassis. When used as the bass component in a multi way design the C-12LF will provide both high acoustic output and very high reliability. High reliability and high power handling are generated by a very effective coupling of the large format 4 inch (101.6mm) diameter voice coil and edge wound rectangular aluminum to the computer designed permanent magnetic system. The large cross sectional area of the C-12LFs voice coil insures low power compression and high thermal capacity. The C-12LF has an operating bandwidth of 60Hz to 2000Hz. This bandwidth is the result of optimizing the mid band efficiency and the low frequency response. The rated bandwidth is ideal for modern two way designs where high efficiency horn and compression driver are used for the high end response. The Challenger Series II uses a newly developed cone material designed for high internal damping and accurate vocal response. The C-12LF is ideal when high intelligibility is specified for vocal fundamentals.

GENERAL SPECIFICATIONS

Nominal Impedance 8 Ω
Power 800 Watt (rms)
SPL 1W@1M average sensitivity 95 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 58 Hz
DC. Resistance Re 6.2 Ω
Coil Inductance Le 0.86 mH
Mechanical Q Factor Qms 6.8
Electrical Q Factor Qes 0.44
Total Q Factor Qts 0.41
BL Product BL 24.63 Tm
Effective Moving Mass Mms 116.64 g
Equivalent Cas Air-Load Vas 27.04 Liters
Effective Piston Area Sd 0.0550 Sqm
Half-Space Efficiency Eff 1.21 %
Airgap Height Hag 10.0 mm
Voice Coil Height Hvc 26.0 mm
Voice Coil Overhang Xmax 8.0 mm

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