Features of W10K9D4:

• Rockville W10K9D4 K9 Series 10" Dual 4-Ohm Car Subwoofer
• Peak Power Handling: 3200 Watts
• Program Power Handling: 1600 Watts   
• CEA Rated RMS Power Handling: 800 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 164 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 4-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: 9.37” inches
• Mounting Depth: 6.3” inches
• Frequency Response: 33 Hz - 1.5K kHz
• 10mm T-Yoke + 10mm Washer
• Sensitivity: 83dB
• Sealed Enclosure Volume: 0.55 – 0.95 Cubic Feet
• Vented/Ported Enclosure Volume: 1.2 – 1.8 Cubic Feet
• Xmax is 27MM.
• Weight: 27.55 Lbs.
• Shipping Weight: 30.85 Lbs.
• Shipping Box Dimensions: 13.58" x 13.58" x 12.6" Inches
• XMAX: 26 MM
  

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	35.16 Hz	35.16 Hz
Qms	6.51	6.51
Cms	0.0853 mm/N	0.0853 mm/N
Bl	25.73 N/A	12.65 N/A
Zmin	11.52 Ω	2.88 Ω
Re	8.40 Ω	2.20 Ω
Qes	0.67	0.73
Mms	240.2074 g	240.2074 g
dBspl	81.53	81.18
L1kHz	7.53 mH	1.86 mH
Sd	340.7101 cm²	340.7101 cm²
Qts	0.61	0.66
Rms	8.62 Ωm	8.15 Ωm
VAS	13.8299 L / .49 cu ft	13.8299 L / .49 cu ft
L10kHz	2.85 mH	0.71 mH