Video of W12K6D4 V2:

 

Features:

• Rockville W12K6D4 V2 K6 Series 12" Dual 4-Ohm Car Subwoofer
• Peak Power Handling: 2400 Watts
• Program Power Handling: 1200 Watts   
• CEA Rated RMS Power Handling: 600 Watts 
• 2.5" 4-Layer Black Aluminum Voice Coils Wound with OFC (100% Copper) Wire
• The wire we use is made in the USA! It is one of the most important components to make the sub high quality and last longer
• Double Stacked 100 Oz High Quality Magnet
• Cast Aluminum Basket With Black Sanded Finish Makes This Sub Very Efficient
• Fiber Reinforced Ultra Stiff Black Non-Pressed Paper Cone
• Thick Foam Surround Provides Incredible Sound Quality With Minimal Distortion
• Red Stitching Cone Reinforcement Ensures Long Life
• Polypropylene (PP) Dustcap
• Two Chrome-Plated Binding Post Terminals - These are the best terminals on the market and they accept any gauge wire
• 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
• Cutout Diameter: 11.125” inches
• Mounting Depth: 5.75” inches
• Frequency Response: 27 Hz - 1.5K kHz
• 8mm T-Yoke + 8mm Washer
• Sensitivity: 85dB
• Sealed Enclosure Volume: 1.0 - 1.5 Cubic Feet
• Vented/Ported Enclosure Volume: 1.65 - 2.5 Cubic Feet
• Weight: 17.64 Lbs.
• Shipping Weight: 22.05 Lbs.
• Shipping Box Dimensions: 15.75" x 15.75" x 13.6" Inches
• XMAX:22 MM (One way)

Detailed Info:

• Body: Non-Pressed Paper
• Gap Plate Inside Diameter: 80mm (3.14 inches)
• Gap Plate Outside Diameter: 156mm (6.14 inches)
• Gap Plate Thickness: 20mm (0.8 inches)
• Yoke Outside Diameter: 145mm (5.71 inches)
• Yoke Thickness: 8mm (0.31 inches)
• Yoke Pole Diameter: 60mm (2.4 inches)

 TS Parameters:

TS Parameter	Wired in Series	Wired in Parallel	Description of Measurement
Electrical Parameters
Re	8.58 Ohm	2.14 Ohm	Electrical voice coil resistance at DC
Le	6.549 mH	1.646 mH	Frequency independent part of voice coil inductance
L2	9.015 mH	2.289 mH	Para-inductance of voice coil
R2	14.79 Ohm	3.72 Ohm	Electrical resistance due to eddy current losses
Cmes	451.49 µF	1832.58 µF	Electrical capacitance representing moving mass
Lces	35.18 mH	8.68 mH	Electrical inductance representing drive compliance
Res	56.58 Ohm	14.09 Ohm	Resistance due to mechanical losses
fs	39.9 Hz	39.9 Hz	Drive resonance frequency
Mechanical Parameters (Using Laser)
Mms	219.823  g	219.582 g	Mechanical mass of drive diaphragm assembly including air load and voice coil
Mmd (Sd)	206.885 g	206.644 g	Mechanical mass of voice coil and diaphragm without air load
Rms	8.605 kg/s	8.505 kg/s	Mechanical resistance of total-drive losses
Cms	0.072 mm/N	0.072 mm/N	Mechanical compliance of drive suspension
Kms	13.84 N/mm	13.81 N/mm	Mechanical stiffness of driver suspension
Bl	22.065 N/A	10.946 N/A	Force factor (Bl product)
Lambda s	-0.013	0	Suspension creep factor
Loss Factors
Qtp	0.873	0.885	Total Q-factor consider all losses
Qms	6.41	6.475	Mechanical Q-factor of of drive in free air considering Rms only
Qes	0.972	0.985	Electrical Q-factor of drive in free air considering Re only
Qts	0.844	0.855	Total Q-factor considering Re and Rms only
Other Parameters
Vas	26.3903 l	26.4413 l	Equivalent air volume of suspension
n0	0.166%	0.164%	Reference efficiency (2 pi-radiation using Re)
Lm	84.4 dB	84.35 dB	Characteristic sound pressure level (SPL at 1m for 1W @ Re)
Lnom	84.1 dB	84.05 dB	Nominal sensitivity (SPL at 1m for 1W @ Zn)
Sd	508 cm²	508 cm²	Diaphragm area
EBP	41.0	40.5	Efficiency bandwidth product