Video of W10K9D2:

 

Authorized Rockville Dealer!

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 Wire Made in USA
• The OFC Wire we use is made in USA. This voice coil we use can hold 240C, and this voice coil is the best one that in the same power handle level. This voice coil can let the subwoofer high quality and work so long time. The temperature resistance is very strong.
• 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 (These are the best terminals on the market and they accept any gauge wire and easy to connect, won't be oxidation)
• 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: 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
  

Detailed Info:

• Body: Non-Pressed Paper
• Gap Plate Inside Diameter: 95mm (3.54 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:

TS Parameter	Wired in Series	Wired in Parallel	Description of Measurement
Electrical Parameters
Re	4.21 Ohm	1.05 Ohm	Electrical voice coil resistance at DC
Le	3.451 mH	0.875 mH	Frequency independent part of voice coil inductance
L2	5.243 mH	1.333 mH	Para-inductance of voice coil
R2	7.85 Ohm	2.01 Ohm	Electrical resistance due to eddy current losses
Cmes	588.91 µF	2366.76 µF	Electrical capacitance representing moving mass
Lces	26.05 mH	6.41 mH	Electrical inductance representing drive compliance
Res	45.09 Ohm	10.9 Ohm	Resistance due to mechanical losses
fs	40.6 Hz	40.9 Hz	Drive resonance frequency
Mechanical Parameters (Using Laser)
Mms	206.092  g	193.072 g	Mechanical mass of drive diaphragm assembly including air load and voice coil
Mmd (Sd)	199.419 g	186.399 g	Mechanical mass of voice coil and diaphragm without air load
Rms	7.761 kg/s	7.486 kg/s	Mechanical resistance of total-drive losses
Cms	0.074 mm/N	0.079 mm/N	Mechanical compliance of drive suspension
Kms	13.44 N/mm	12.73 N/mm	Mechanical stiffness of driver suspension
Bl	18.707 N/A	9.032 N/A	Force factor (Bl product)
Lambda s	0.034	0.029	Suspension creep factor
Loss Factors
Qtp	0.607	0.608	Total Q-factor consider all losses
Qms	6.78	6.623	Mechanical Q-factor of of drive in free air considering Rms only
Qes	0.633	0.636	Electrical Q-factor of drive in free air considering Re only
Qts	0.579	0.58	Total Q-factor considering Re and Rms only
Other Parameters
Vas	11.2424 l	11.8661 l	Equivalent air volume of suspension
n0	0.115%	0.123%	Reference efficiency (2 pi-radiation using Re)
Lm	82.79 dB	83.08 dB	Characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom	82.56 dB	82.89 dB	Nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd	326.7 cm²	326.7 cm²	Diaphragm area
EBP	64.1	64.3	Efficiency bandwidth product

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About Rockville Quality Control Procedures:
The Rockville brand stands for Quality, Innovation and Value. All Rockville products go through the most rigorous quality control standards in the industry. Products go through months of extensive testing before they reach your hands. All user functions are tested and all internal components are tested for quality. Rockville makes products that are virtually un-breakable! Rockville is one of the only brands in its class to test every concept model for weeks or months before starting production. Once production begins, Rockville sends product engineers to their factory to quality control every line of production. During production every product is tested and on top of that Rockville goes the extra mile and has their high level product engineers do an additional quality control. They test a certain percentage of all products from the production line a second time to ensure that the quality meets their vigorous standards, and to make sure that there is never a batch of products with even a slight problem. All Rockville products are backed with a hassle free warranty, though it is unlikely that you will need to use it.