Video of K5 Series UPDATED:

Features:

• Rockville DV8K52 Dual 8" K5 1600w Car Subwoofers Pre-loaded In Vented Sub Enclosure
• Peak Power Handling: 1600 Watts
• Program Power Handling: 800 Watts
• CEA Rated RMS Power Handling: 400 Watts
• Final Impedance: 2 Ohm
• ¾” MDF enclosure
• Bonded stapled and braced
• Computer designed vents
• Angled at 15 % for perfect bass alignment
• High quality aviation grade tweed carpet
• Satin Nickel speaker wire push terminals
• Enclosure air space is 0.8 Cu Ft per sub
• Vent dimensions (inches): 2.5" x 6.75" x 9.75"
• Tuning frequency of enclosure: 44 Hz
• 1.5" 4-Layer Black Aluminum Voice Coils Wound with OFC (100% Copper) Wire
• The wire we use to wind the voice coil is imported from Japan which is way better quality than the standard China wire
• 30 Oz High Quality Magnet
• Cast Iron Basket With Black Sanded Finish
• Fiber Reinforced Ultra Stiff Black Non-Pressed Paper Cone – This cone is very efficient which makes the speaker sound louder even without requiring a lot of power to push it
• Thick Foam Surround Provides Incredible Sound Quality With Minimal Distortion
• Blue Stitching Cone Reinforcement Ensures Long Life
• Polypropylene Dust cap
• Gold-Plated spring loaded push terminals
• Impedance: Single 4-Ohm Voice Coils
• Vented Hole on T-yoke Enhances Heat Dissipation
• Mounting Gasket with Rockville branding Makes it Easy To Mount the Subwoofer Air-Tight
• High BL Magnetic Motor Gap
• High grade black glue that handles extremely high temperatures which allows our woofer to handle even more power
• Cutout Diameter: 7.16 inches
• Mounting Depth: 3.54 inches
• Frequency Response: 44 Hz - 1.3K kHz
• 5mm T-Yoke + 5mm Washer
• Sensitivity: 85.7dB
• Weight: 37.7 Lbs.
• Dimensions of enclosure: 24.25“x 14.75" x12"
• Shipping Weight: 43.1 Lbs.
• Shipping Box Dimensions: 25.4" x 16.1" x 14.1"

Detailed Info of Subwoofer:

• Body: Non-Pressed Paper
• Gap Plate Inside Diameter: 60mm (2.36 inches)
• Gap Plate Outside Diameter: 120mm (4.72 inches)
• Gap Plate Thickness: 25mm (0.98 inches)
• Yoke Outside Diameter: 114mm (4.48 inches)
• Yoke Thickness: 5mm (0.20 inches)
• Yoke Pole Diameter: 38mm (1.5 inches)

T/S Parameters (Tested on a Klippel):

Electrical Parameters

• Electrical voice coil resistance at DC: Re 3.43 Ohm
• Frequency independent part of voice coil inductance: Le 0.899 mH
• Para-inductance of voice coil: L2 1.32 mH
• Electrical resistance due to eddy current losses: R2 13.71 Ohm
• Electrical capacitance representing moving mass: Cmes 610.26 µF
• Electrical inductance representing driver compliance: Lces 20.57 mH
• Resistance due to mechanical losses: Res 34.13 Ohm
• Driver resonance frequency: fs 44.9 Hz

Mechanical Parameters

Using laser

• Mechanical mass of driver diaphragm assembly including air load and voice coil: Mms 54.697 g
• Mechanical mass of voice coil and diaphragm without air load: Mmd (Sd) 51.475 g
• Mechanical resistance of total-driver losses: Rms 2.626 kg/s
• Mechanical compliance of driver suspension: Cms 0.229 mm/N
• Mechanical stiffness of driver suspension: Kms 4.36 N/mm
• Force factor (Bl product): Bl 9.467 N/A
• Suspension creep factor: Lambda s 0.046

Loss factors

• Total Q-factor considering all losses: Qtp 0.538
• Mechanical Q-factor of driver in free air considering Rms only: Qms 5.879
• Electrical Q-factor of driver in free air considering Re only: Qes 0.591
• Total Q-factor considering Re and Rms only: Qts 0.537

Other Parameters

• Equivalent air volume of suspension: Vas 13.1298 (1)
• Reference efficiency (2 pi-radiation using Re): n0 0.194 %
• Characteristic sound pressure level (SPL at 1m for 1W @ Re): Lm 85.07 dB
• Nominal sensitivity (SPL at 1m for 1W @ Zn): Lnom 85.74 dB
• Root-mean-square fitting error of driver impedance Z(f): rmse Z 4.04 %
• Root-mean-square fitting error of transfer function Hx (f): rmse Hx 2.29 %
• Diaphragm area: Sd 201.06 cm2