300W Peak (150W) RMS 8" Amplified and Loaded Under Seat Quick Bass Universal Subwoofer System with Ported Enclosure

Shop all NVX
Product videos

• Low Profile Ported Subwoofer System
• 150 Watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control

Learn more about the qbus8p
Was $199.95 Details
Thanks , You Pay:


 with warranty

Heads up

We confirm fitment and offer accessories for speakers. Please set your vehicle first if you would like to purchase more than one qbus8p.

Set your vehicle or Return to product page
shipping truck icon Free shipping in USA. Provide zip for delivery date.
In Stock
Brand new

Buy it now

Acima Logo

No Credit Option

Flexible Lease Payments

Early Purchase Options

Quick Approval Decision

Allstate logo

Keep your product protected longer! Extend the warranty after the manufacturer warranty expires. 

  • Mechanical, electrical and product failure covered! 100% parts and labor covered. (Coverage starts after Mfr. warranty)
  • Easy online management! Zero hassle claim service, available 24/7
Swoosh Icon Icon of Swoosh

For over 23 years, we've been your X-Factor – the team dedicated to having the biggest impact on your shopping experience!

Award winning icon
Award-Winning Service
Shipping icon
FREE Shipping Orders $49+
60 days return policy icon
60-Day Easy Returns
lowest price guarantee icon
Guaranteed Lowest Price
In-House Experts

Expert built bundles that save you more (1)

Choose from any of our many bundles that include this product for even more savings!

NVX QBUS8P + Belva BAK82 8 Gauge Amp Wiring Kit

150W RMS Amplified and Loaded 8" Under Seat Quick Bass Universal Subwoofer System with Ported Enclosure



Product Highlights

• Low Profile Ported Subwoofer System
• 150 Watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control


NVX brand icon

Authorized dealer

8 Inch Underseat Subwoofer
Compact Design Bass Level Control 150W RMS
Ported Enclosure Design

Product Details:

  • 8" Active Enclosed Low Profile Powered Ported Subwoofer System
  • Power Handling:
    • Peak: 300 watts
    • RMS: 150 watts
  • All weather woven fiber glass woofer cone
  • S/N Ratio: 91 dB
  • Ported Enclosure Design
  • Output Impedance: 2 Ohm
  • Adds crisp, clean bass to any system
  • Built-in Class-D Amplifier
  • Wired remote bass level control included
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +12 dB bass boost at 45Hz)
  • Speaker-level (high-level) inputs with signal sensing for automatic turn-on
  • Heavy duty die-cast aluminum alloy heat-sink for extreme heat dissipation
  • Silver-plated RCA level inputs
  • Silver-plated screw terminals
  • Input sensitivity:
    • Low Level Input: 150mV - 6V
    • High Level Input: 1V - 8V
  • Variable low-pass filter (50-150 Hz)
  • Phase Shift: 0-180°
  • Frequency response: 20-150 Hz
  • 8 gauge power and ground wiring is required for installation
  • Dimensions: Length: 13” x Width: 9.4” x Height: 3.2”
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product history:

NVX QBUS8P thumbnail
(newest, current model)
NVX QBUS8v2 thumbnail
(previous model, replaced by NVX QBUS8P)
NVX QBUS8 thumbnail
(previous model, replaced by NVX QBUS8v2 (Ships as New Model QBUS8P))

Specifications & Details

Subwoofer Amplifier Power Specifications
RMS Power @ 2 ohms
150 watts x 1 channel
Peak Power Output
300 watts x 1 channel
Amplifier Specifications
Amplifier Class
Number of Channels
1 - Mono
Maximum Input Gauge Size
Speaker Level Inputs
Built-in Crossover
Low-Pass (LP)
Low-Pass Crossover Frequency
50 - 150 Hz
Signal-to-Noise Ratio
91 dB
Bass Boost
0 - 12 dB
Remote bass/level controller
CEA-2031 Compliant
Subwoofer Specifications
Subwoofer Size
RMS Power Handling
150 watts
Total RMS Power Handling
150 watts
Peak Power Handling
300 watts
Total Peak Power Handling
300 watts
Woofer Surround
Woofer Composition
Frequency Response
20 - 150 Hz
Subwoofer Design
Round / Circle
Enclosure Specifications
Box Type
Number of Subwoofers
Box Style/Shape
Box Exterior Color
Box Finish
Final Wired Impedance
Amplifier Wiring Kit
Is Amplifier Wiring Kit included?
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details



Model Number:




Internal SKU:


Internal Product ID:


Product and How-to Videos

Customer Ratings & Reviews

5 star
4 star
3 star
2 star
1 star


Customer Photos & Videos

Customer Reviews

Sort by:


The port makes all the difference!

I swapped out an SSL 8 inch powered sub for this ported NVX sub in my wife's Outlander. I have it positioned under the front passenger seat, with an RCA adapter to the factory headunit. Holy smokes, this sub blew the old sub out of the water! Obviously this thing isn't meant to shake mirrors, but the lows are much more pronounced, thankfully without any port noise. I've been running it for a couple weeks now and it started to really come alive a couple days after install. Very happy with this sub!

By Tim on March 2, 2022 Checkmark Icon Verified purchase


found this helpful.

Better than the 8" competition sub in a full enclosure with a 900W amp

I had a classic VW convertible with an 8" competition sub on the rear package tray but with the top down you couldn't really get much bass out of it. Figured I would try this under the seat sub and was very surprised! I removed the sub on the package tray and will use just this one for my build. Very happy with it.

By Dean on July 7, 2022 Checkmark Icon Verified purchase


found this helpful.

Not bad for limited spaces

Does a decent job for a small subwoofer. Not going to win any competitions buy definitely enough bass for me. I would recommend for anyone that does not have a lot of space for a subwoofer.

By Timothy on February 19, 2022 Checkmark Icon Verified purchase


found this helpful.

Lounder then you think! Great value!

Easy to install and set up. Installed in a jeep patriot. Definitely louder then you think it would be. Adds just the right amount of bass at a great value. Feels well built and durable, everything it well protected. Would 100% recommend if your just wanting that little extra bass with your music with out breaking the bank.

By Justin on April 30, 2023 Checkmark Icon Verified purchase


found this helpful.

This thing rocks

Purchased this NVX under seat powered enclosed 8" subwoofer, for one of my 1st Gen regular cab Tacoma pickups, because of the lack of cab space.
After installing this NVX unit, I was blown away at how awesome it sounds. It really brings the bass to my music, and in a small amount of space.
I definitely recommend this NVX enclosed powered subwoofer.
I highly recommend this product.
High quality, awesome sound ,and great price. Thanks you guys at Sonic Electronix !!

By Darrell on December 16, 2023 Checkmark Icon Verified purchase


found this helpful.

Received in 3 days, fast shipping. Very good build quality and have some weight to it. As usual another great buy from Sonic, I haven’t been disappointed yet from these guys. Thanks!

By Tim on December 11, 2023 Checkmark Icon Verified purchase


found this helpful.

By Miguel on May 3, 2024 Checkmark Icon Verified purchase


found this helpful.


Similar Products

Best selling similar products


• 11" Spare Tire Subwoofer System
• Built-In Class D Amplifier
• Top-mount amplifier controls
• Speaker-Level Inputs
• Wired Remote Bass Level Control




• Low Profile Ported Subwoofer System
• 200 Watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control



MTX Audio TNP212D2 Terminator Dual Subwoofer Package + Amplifier

• 800W Peak (2 Subs)
• 400W RMS (2 Subs)
• 48oz. Magnet
• Terminator Series Class D Monoblock Car Amplifier
• Heavy 5/8" MDF Construction
• Black Carpeting



Wet Sounds STEALTH AS-10

• 500 W Single 10" Sealed Subwoofer Enclosure with Built-In Amplifier
• 10" Subwoofer
• Built-In 500 W Class D Amplifier
• Rotationally Molded Polyethylene Housing
•Easy Plug & Play connection
• Enclosure Dimensions:11.5" D x 14.74" W x 12.75" H



Cerwin-Vega BKX212S

• XED Series Bass Package
• Two 12" Subwoofers with 2" Voice Coill
• 400W RMS Monoblock Amplifier
• Carpeted and Embroidered Enclosure



Related Searches

QBUS8P small

Item added to your cart.

Price: $129.99

Essential add-ons
Belva BAK82

Complete 8 Gauge Amplifier Wiring Kit with 2-Channel RCA Cable (CCA Wiring)



Add to cart

Trunk Kit - 20 Square Feet of Sound Dampening Material (Five 18" x 32" Pieces)



Add to cart
Dynamat Xtreme 20' Trunk Kit 19405

20 ft. Trunk Kit with (5) Dynamat Extreme 18" x 32" Pieces



Add to cart
Boom Mat Damping Material (050210)

20.8 sq.ft Damping Material - (10 pk - 12-1/2" x 24" x 2mm )



Add to cart
Save up to 10 different vehicles in your garage

Add vehicle
Identify your vehicle and submodel details
  • Owner’s manual
  • Vehicle’s insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver’s side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon