Features of W12K9D2:

• Rockville W12K9D2 K9 Series 12" Dual 2-Ohm Car Subwoofer
• Peak Power Handling: 4000 Watts
• Program Power Handling: 2000 Watts   
• CEA Rated RMS Power Handling: 1000 Watts 
• 3" 4-Layer Black Aluminum Voice Coils Wound with OFC Wire Made in USA
• This voice coil is stable up to 240 degrees celcius! The voice coil windings are made in the USA!
• Double Stacked 190 Oz High Quality Magnet
• Cast Aluminum Basket With Black Sanded Finish Makes This Sub Very Efficient And Lighter Weight
• Two Chrome-Plated Binding Post Terminals 
• Black Non-Pressed Paper Cone With Beautiful Finish
• Our cones are ultra-stiff. They are thicker and stronger than other subs on the market making our subs able to handle more power.
• Thick Foam Surround Provides Incredible Sound Quality With Minimal Distortion
• Red Stitching Cone Reinforcement Ensures Long Life
• New Ultra-stiff  PolyPropylene (PP) Dustcap
• Impedance: Dual 2-Ohm Voice Coils
• Vented Hole on T-yoke Enhances Heat Dissipation
• Special Custom Rubber Boot Magnet Covers Make the Woofer Look Nice and Protects the Magnet
• Custom Rockville Mounting Gasket Looks Beautiful and Makes it Easy To Mount the Subwoofer Air-Tight
• High BL Magnetic Motor Gap
• We use the highest grade black glue that handles extremely high temperatures which allows our woofer to handle even more power than they are rated
• Nomex Spider provides tear resistance, strength and long-term reliability over regular cotton and poly cotton spiders
• Cutout Diameter: 11.13” inches
• Mounting Depth: 6.85” inches
• Frequency Response: 33 Hz - 1.5K kHz
• 10mm T-Yoke + 10mm Washer
• Sensitivity: 83dB
• Sealed Enclosure Volume: 0.9 – 1.47 Cubic Feet
• Vented/Ported Enclosure Volume: 1.8 – 2.75 Cubic Feet
• XMAX is 28MM
• Weight: 28.67 Lbs.
• Shipping Weight: 33 Lbs.
• Shipping Box Dimensions: 14.57" x 14.57" x 10.83" Inches
• XMAX: 28MM

Detailed Info:

• Body: Non-Pressed Paper
• Gap Plate Inside Diameter: 95mm (3.74 inches)
• Gap Plate Outside Diameter: 190mm (7.5 inches)
• Gap Plate Thickness: 25mm (1 inch)
• Yoke Outside Diameter: 180mm (7.1 inches)
• Yoke Thickness: 10mm (0.4 inches)
• Yoke Pole Diameter: 75mm (3 inches)

TS Parameters:

	Series	Parallel
Fs	34.42 Hz	34.42 Hz
Qms	7.88	8.10
Cms	0.0727 mm/N	0.0727 mm/N
Bl	18.56 N/A	9.16 N/A
Zmin	5.77 Ω	1.43 Ω
Re	4.20 Ω	1.20 Ω
Qes	0.78	0.91
Mms	294.2146 g	294.2146 g
dBspl	84.07	83.37
L1kHz	4.76 mH	1.18 mH
Sd	548.0133 cm²	548.0548 cm²
Qts	0.71	0.82
Rms	8.07 Ωm	7.85 Ωm
VAS	30.4676 L / 1.08 cu ft	30.4723 L / 1.08 cu ft
L10kHz	1.82 mH	0.45 mH