Product Review

Features:

Rockville W10K9D2 K9 Series 10" Dual 2-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 (100% Copper) Wire Made in Japan
The CCAW Wire we use is made in Japan. It is one of the most important components to make the sub high quality and last longer. (Most subs on the market use wire made in China which can not handle nearly as high temperatures as our wire that is made in Japan)
Double Stacked 164 Oz High Quality Magnet
Cast Aluminum Basket With Black Sanded Finish Makes This Sub Very Efficient And Lighter Weight
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
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: 9.37” inches
Mounting Depth: 6.3” inches
Frequency Response: 37.8 Hz - 1.5K kHz
10mm T-Yoke + 8mm Washer
Sensitivity: 85dB
Sealed Enclosure Volume: 0.5 - 0.9 Cubic Feet
Vented/Ported Enclosure Volume: 1.2 - 1.6 Cubic Feet
Weight: 27.55 Lbs.
Shipping Weight: 30.85 Lbs.
Shipping Box Dimensions: 13.58" x 13.58" x 12.6" Inches
TS Parameters:

Fms: 37.8 Hz
Res: 92.8 Ohm
Re: 4.0 Ohm
Qms: 4.76
Qes: 0.45
Qts: 0.41
Rms: 8.7kg/s
Cms: 0.10mm/N
Mms: 174.6 gr
Nref: 0.18%
Bl: 19.3N/A
SPL: 85dB
VAS: 15.5L
Rp: 39.9 Ohm
LP: 33.6mH
CP: 693.5uF
Le: 1.86mH