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Rockville W12K9D4 12"4000w Car Audio Subwoofer Dual 4-Ohm Sub CEA Compliant

SKU:
W12K9D4 U
$249.00 $103.46
(You save $145.54)
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Condition:
Used
Custom_Condition:
SLIGHTLY USED, TESTED TO BE IN PERFECT WORKING CONDITION, IN GREAT COSMETIC CONDITION, AND INCLUDES ORIGINAL BOX
Bundle:
No

Warranty Information:

1 YEAR

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Video of W12K9D4:


Authorized Rockville Dealer!

 

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Features:

  • Rockville W12K9D4 K9 Series 12" Dual 4-Ohm Car Subwoofer
  • Peak Power Handling: 4000 Watts
  • Program Power Handling: 2000 Watts   
  • CEA Rated RMS Power Handling: 1000 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 190 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 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
  • Nomex Spider provides tear resistance, strength and long-term reliability over regular cotton and poly cotton spiders
  • Cutout Diameter: 11.13” inches
  • Mounting Depth: 6.85” inches
  • Frequency Response: 33 Hz - 1.5K kHz
  • 10mm T-Yoke + 10mm Washer
  • Sensitivity: 83dB
  • Sealed Enclosure Volume: 0.8 - 1.25 Cubic Feet
  • Vented/Ported Enclosure Volume: 1.75 - 3.0 Cubic Feet
  • Weight: 28.67 Lbs.
  • Shipping Weight: 33 Lbs.
  • Shipping Box Dimensions: 14.57" x 14.57" x 10.83" Inches

Detailed Info:

  • Body: Non-Pressed Paper
  • Gap Plate Inside Diameter: 95mm (3.74 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

8.11 Ohm

2.02 Ohm

Electrical voice coil resistance at DC

Le

5.536 mH

1.393 mH

Frequency independent part of voice coil inductance

L2

8.736 mH

2.195 mH

Para-inductance of voice coil

R2

13.27 Ohm

3.31 Ohm

Electrical resistance due to eddy current losses

Cmes

422.67 µF

1687.52 µF

Electrical capacitance representing moving mass

Lces

29.66 mH

7.39 mH

Electrical inductance representing drive compliance

Res

58.88 Ohm

14.69 Ohm

Resistance due to mechanical losses

fs

44.9 Hz

45.1 Hz

Drive resonance frequency

Mechanical Parameters (Using Laser)

Mms

231.32 g

224.776 g

Mechanical mass of drive diaphragm assembly including air load and voice coil

Mmd (Sd)

217.56 g

211.015 g

Mechanical mass of voice coil and diaphragm without air load

Rms

9.294 kg/s

9.069 kg/s

Mechanical resistance of total-drive losses

Cms

0.054 mm/N

0.055 mm/N

Mechanical compliance of drive suspension

Kms

18.45 N/mm

18.02 N/mm

Mechanical stiffness of driver suspension

Bl

23.394 N/A

11.541 N/A

Force factor (Bl product)

Lambda s

0.035

0.023

Suspension creep factor

Loss Factors

Qtp

0.891

0.891

Total Q-factor consider all losses

Qms

7.029

7.018

Mechanical Q-factor of of drive in free air considering Rms only

Qes

0.968

0.966

Electrical Q-factor of drive in free air considering Re only

Qts

0.851

0.849

Total Q-factor considering Re and Rms only

Other Parameters

Vas

21.4881 l

22.0007 l

Equivalent air volume of suspension

n0

0.194%

0.2%

Reference efficiency (2 pi-radiation using Re)

Lm

85.07 dB

85.22 dB

Characteristic sound pressure level (SPL at 1m for 1W @ Re)

Lnom

85.02 dB

85.17 dB

Nominal sensitivity (SPL at 1m for 1W @ Zn)

Sd

529.3 cm²

529.3 cm²

Diaphragm area

EBP

46.4

46.7

Efficiency bandwidth product


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.

1 YEAR
  • UPC:
  • 613815769095

Free shipping to the 48 continental USA only. Orders placed by 1:00 EST will ship same day.
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