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Rockville VS12K54 12" K5 1400w Car Subwoofer in Vented Sub Enclosure Box - 4 Ohm

$260.00 $99.95
(You save $160.05)
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Video of K5 Series UPDATED:


  • Rockville VS12K54 Single 12" K5 1400w Car Subwoofer Pre-loaded In Vented Sub Enclosure
  • Peak Power Handling: 1400 Watts
  • Program Power Handling: 700 Watts
  • CEA Rated RMS Power Handling: 350 Watts
  • Final Impedance: 4 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 1.52 Cu Ft per sub
  • Vent dimensions (inches): 2.25" x 7" x 8.5"
  • Tuning frequency of enclosure: 35 Hz
  • 2" 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
  • 50 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 Dustcap
  • 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: 11.02” inches
  • Mounting Depth: 5.03” inches
  • Frequency Response: 25 Hz - 1.5K kHz
  • 6mm T-Yoke + 6mm Washer
  • Sensitivity: 88dB
  • Weight: 10.1 Lbs.
  • Loaded enclosure weight: 37.4 Lbs.
  • Loaded enclosure dimensions (inches): 18.25” x 14.25” x 16.25”

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: 25mm (0.98 inches)
  • Yoke Outside Diameter: 145mm (5.7 inches)
  • Yoke Thickness: 6mm (0.23 inches)
  • Yoke Pole Diameter: 50mm (2 inches)

T/S Parameters (Tested on a Klippel):

Electrical Parameters

  • Electrical voice coil resistance at DC: Re 3.31 Ohm
  • Requency independent part of voice coil inductance: Le 0.944 mH
  • Para-inductance of voice coil: L2 1.468 mH
  • Electrical resistance due to eddy current losses: R2 14.7 Ohm
  • Electrical capacitance representing moving mass: Cmes 871.67 μF
  • Electrical inductance representing driver compliance: Lces 20.9 mH
  • Resistance due to mechanical losses: Res 31.48 Ohm
  • Driver resonance frequency: fs 37.3 Hz

Mechanical Parameters

Using laser

  • Mechanical mass of driver diaphragm assembly including air load and voice coil: Mms 130.02 g
  • Mechanical mass of voice coil and diaphragm without air load: Mmd (Sd) 117.731 g
  • Mechanical resistance of total-driver losses: Rms 4.738 kg/s
  • Mechanical compliance of driver suspension: Cms 0.14 mm/N
  • Mechanical stiffness of driver suspension: Kms 7.14 N/mm
  • Force factor (Bl product): Bl 12.213 N/A
  • Suspension creep factor: Lambda s 0.028

Loss factors

  • Total Q-factor considering all losses: Qtp 0.612
  • Mechanical Q-factor of driver in free air considering Rms only: Qms 6.429
  • Electrical Q-factor of driver in free air considering Re only: Qes 0.675
  • Total Q-factor considering Re and Rms only: Qts 0.611

Other Parameters

  • Equivalent air volume of suspension: Vas 47.7813 (1)
  • Reference efficiency (2 pi-radiation using Re): n0 0.353 %
  • Haracteristic sound pressure level (SPL at 1m for 1W @ Re): Lm 87.67 dB
  • Nominal sensitivity (SPL at 1m for 1W @ Zn): Lnom 88.5 dB
  • Root-mean-square fitting error of driver impedance Z(f): rmse Z 3.94 %
  • Root-mean-square fitting error of transfer function Hx (f): rmse Hx 2.2 %
  • Diaphragm area: Sd 490.87 cm2

  • UPC:
  • 819216024775

WARNING: Cancer and Reproductive Harm —

Car Subwoofer Impedance Wiring Guide

Use our car subwoofer and amp wiring diagrams to figure out which amplifier is compatible with your subwoofer(s) and how to wire it properly.

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