6.5-inch (165 mm) Component Woofer
Cone and Dust Cap:
Vacuum-formed, mineral-filled polypropylene material offers excellent damping and low mass. The cone body features a gentle curvilinear profile to optimize response. A specially shaped dust cap attaches to the cone body and the voice coil former to improve high frequency behavior.
The moving assembly is suspended and damped via a large-diameter, linear profile spider formed from a Nomex®/polycotton blend, and a positive-roll, rubber surround. The two combine to provide optimum damping without prematurely restricting the C7-650cw’s outstanding excursion capability.
The C7-650cw employs a high-density magnetic circuit with a high-grade Y35 Strontiumferrite magnet, and a specially machined, T-Yoke motor topology. Motor magnetics have been precisely optimized utilizing advanced FEA tools to reduce distortion and provide linear motor force throughout the driver’s performance range.
A 32 mm (1.27 inch) diameter, overhung voice coil is employed, wound with copper wire onto a fiberglass voice coil former. The oversized voice coil offers extended power handling capability, minimizing thermal compression and distortion at higher listening levels.
A purpose-engineered cast alloy basket is employed, featuring thin spokes to maximize rear open area, and our Patented Elevated Frame Cooling technology.
With 48 dB/octave filters: 50 Hz - 5 kHz With 24 dB/octave filters: 60 Hz - 5 kHz With 12 dB/octave filters: 70 Hz - 5 kHz
Speaker Type: Component Woofer
Nominal Diameter: 6.5 in. (165 mm)
Design Bandwidth: 50 Hz - 5 kHz
Nominal Impedance (Znom): 4 ohms Continuous
Power Handling: 125W
Recommended Amplifier Power: 50-175W
Net Weight: 3.28 lbs. (1.49 kg)
Driver Rear Displacement: 0.0135 cu.ft. (0.382 liters)
Min. Recommended Sealed Enclosure: 0.424 cu.ft. (12 liters)
Voice Coil Resistance (Re): 3.114 ohms
Free Air Resonance (Fs): 54.5 Hz
Reference Efficiency (no): 0.304%
Efficiency @ 1W/1m: 87.0 dB
SPL Sensitivity @ 2.83V/1m: 90.0 dB
SPL Electrical “Q” (Qes): 0.669
Mechanical “Q” (Qms): 6.265 T
otal Speaker “Q” (Qts): 0.605
Equivalent Compliance (Vas): 0.461 cu.ft. (13.05 liters)
Moving Mass (Mms): 17.679 g
Mechanical Compliance (Cms): 0.000482
m/N Magnetic Strength (BL): 5.31
N/A Effective Piston Area (Sd): 21.4 sq.in. (0.013807 sq. m)
One-Way Linear Excursion (Xmax): 5 mm