What’s in the box
- Subwoofer
Top Features
✅ 1400 W Peak Power Handling – Ready to shake mirrors and make neighbors regret your friendship.
✅ 12″ K5 Subwoofer Driver – Delivers tight, controlled low-end response across genres.
✅ Vented Enclosure Design – Enhances airflow for louder, cleaner bass with less distortion.
✅ Durable Construction – Built to withstand heat, vibration and serious daily use.
✅ 4 Ohm Impedance – Compatible with most aftermarket amps for easy tuning and installation.
This isn’t a budget toy. It’s a real subwoofer for car audio enthusiasts who want performance and longevity without dropping crazy money on custom fiberglass setups.
Product description
Rockville VS12K54 12″ K5 1400w Car Subwoofer in Vented Sub Enclosure Box – 4 Ohm
\
Performance for the People
The VS12K54 makes upgrading your car audio system stupidly simple — just hook it up and let the bass roll. The 4 Ohm load means you get a solid hit without overloading your amp, and its vented design ensures you get every note of that low-end rumble.
Rockville’s K5 driver uses a high-temperature voice coil and thick cone material for improved durability under stress. Translation: it gets loud and stays that way.
Features:
- 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”
Why Upgrade to the VS12K54?
Because factory sound systems are fine for people who think a “bass boost” button is a subwoofer. You’re not that person. You want to feel your music, not just hear it. And that’s exactly what this Rockville box delivers — no nonsense, no fragile cone failures, just hard-hitting sound that turns every drive into a mini concert.
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
From the brand
Final Verdict
If you want a subwoofer that’s loud, clean, and built for real enthusiasts, the Rockville VS12K54 1400W 12″ K5 is a no-brainer. With a tuned vented enclosure and strong power handling, it’s a perfect blend of performance and durability — all without the premium price tag.
🔥 Upgrade Your Sound Now at ProStreetOnline.com
element –
I bought thus enclosure because it had the specs I wanted for my 12 alpine s2. It would fit the sub without the trim ring. I had to extensively modify the front to get the trim and grill on. It sounds good but not great this way. Not too much better than the sub it came with, just louder. I’m gonna switch to a sealed box as i miss the clean bass. This box had a delay like it had to load up for fast bass with the alpine. I didn’t like it. This is a good sub and box. Just might not want to swap the sub out IMHO.
Kristin Hugall –
17 year old loves this speaker!
wesley78 –
It might have been me but I thought I ordered a different one out of the 3 styles you can order, there was one that didn’t show ohm one that said 2 ohm and a 4 ohm, there wasn’t much a price difference but I always go for 2ohm and I got the lower one. It’s a lot of trouble to return items where I live because you have to go to next county. For the price it does decent but a 2ohm there is a difference. If your looking for loud system with thump this is it. The 2ohm would give you more bass. The three stars is for sending the 0ohm
lewis snyder Account –
Put in my car but it’s fairy heavy but need to finish it?
Sundiata Monoarfa –
Great sub for the value!
Aaron Korger –
1. Buy this combo kit (if available used for $71-75, then even better – get that2. Remove the K5 Subwoofer – put it in storage, sell it locally on Facebook for $40-503. Buy a Rockville K6 V2 sub (89.899) and install into this enclosure -Nothing against the K5 but the K6 is an amazing sub for $90 and in this enclosure it sounds amazing. Tight, punchy, musical. Period
Denny –
It worked for about 10 minutes. Amazon did a great job and return my purchase price. The speaker. looked like it was decent quality. It was heavy, but only lasted a very short time before it started popping.
Julian Rail –
Sounds good hits harder than I expected