Search  for anything...

Harmony Audio 12" SPL Competition Subwoofer Pair Dual 1 Ohm 3000 Watt

Based on 16 reviews
Condition: New
Checking for the best price...
$589.99
Holiday Deal · 65% off was $1,699.99

Buy Now, Pay Later


As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2027

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by HiFi-Soundconnection

Arrives Tuesday, Nov 17
Order within 2 hours and 45 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

At a glance

Condition
New
Size
1 Ohm
Style
Two Pack
Model
HA-ML121x2
Color
Monolith - 2 Subs
Frequency Response
300 hertz
Audio Output Mode
Mono
Works with
Television, Laptop, Smartphone, Tablet

Features 5

  • HIGH-QUALITY CONSTRUCTION: The subwoofer features a robust construction with a focus on durability and performance. The cone is crafted from high-quality materials to ensure rigidity and minimize distortion, even under demanding conditions. The subwoofer is built to withstand the rigors of competition and continuous high-power use.
  • 3000W PEAK POWER HANDLING: The Monolith 12" Competition Subwoofer boasts an impressive peak power handling of 3000 watts, making it capable of delivering thunderous and deep bass notes. This high power rating is ideal for users who crave an immersive and impactful audio experience.
  • DUAL 1 OHM IMPEDANCE: With a dual 1-ohm impedance configuration, this subwoofer provides versatile wiring options. Users can choose from various wiring configurations to match their amplifier setup and achieve the desired impedance for optimal performance.
  • DUAL VOICE COIL DESIGN: The dual voice coil (DVC) design enhances the flexibility of wiring configurations. It allows users to customize the impedance and match the subwoofer to their amplifier's capabilities, providing options for different setups and applications.

Description

Why do all Harmony Audio subs feature interwoven tinsel leads? The answer is simple we demand nothing but the best. A tinsel lead is a small wire that connects the voice coil to the input terminal and if you look at most other subs its positioned so when the subwoofer is playing the cone will actually slap into the leads creating a pop noise when playing. The advantage to an interwoven tinsel leads is both increased durability and performance which is what Harmony Audio is all about. The greatest enemy of a car audio subwoofer is heat which needs to be quickly dissipated for a sub perform correctly and is crucial to prolong the life of the subwoofer. Harmony Audio Rhythm, Alloy, Carbon & Monolith series subs feature large slotted vents directly under the spider which allows cool air to quickly reach all the sensitive components. The Flatline series features a unique fin-shaped heatsink that transfers heat away from the voice coil. Cutting corners is not the Harmony Audio way and while other manufacturers may be cutting out features to save a penny we are focused on producing a superior performing subwoofer. Take the wire terminal for instance probably one of the most important features of the sub which is what handles the power transfer from your amp to the sub. Many other brands now use a cheap spade terminal that takes longer to install and who knows if it will even stay connected once installed. All Harmony Audio subs feature a spring-loaded push terminal that will accept direct speaker wire ensuring the ultimate connection and power transfer.

Specs 32

Brand Harmony Audio
Speaker Maximum Output Power 3000 watts
Frequency Response 300 hertz
Connectivity Technology wired
Audio Output Mode Mono
Mounting Type Car Mount
Speaker Type Subwoofer
Additional Features Durable

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Nov 17

Yes, absolutely! This item's return window has been extended for the holiday season: Returnable until Jan 31, 2027.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


Great subwoofer
Size: 1 Ohm Style: Single Pack
I originally ordered one of these 2ohm subs for my wife’s Nissan and I loved it. I ended up buying this 1ohm sub for my truck and I have it wired 2ohm and have the harmony sound box as well. I have an nvx nda104 3k mono block powering this sub and it delivers great sound and hard clean bass. The cone and dust cap are carbon fiber and stitched and rugged. The box and sub weighs over 100 pounds,fyi so if you’re just looking for a basic sub keep moving. This sub is power hungry either feed it the power it needs or don’t waste your time. I broke my sub in at half power for a solid two weeks and it’s been perfect since. I’ve had numerous other top brands and cheap china garbage and this sub is beyond worth the money and makes other top brands look really bad when the price comes to play. Again this is not a beginner or just a small upgrade subwoofer. If you by this sub know it’s 3k watts rms it requires a suitable amp and an amp powering range his sub is gonna draw at least 100 amps and it’s going to require the big 3 upgrade, a second battery and isolator and by all means not a cheap wiring kit. Zero guage is a must. With that said if you don’t plan on all of that don’t buy this sub because you will most definitely over work your amp because it will be starving for power and that will send a clipped signal to your sub it will get hot and it will destroy your sub your amp and if your fuse doesn’t pop it will definitely melt an under sized power wire and probably start a fire. I have close to 3100 watts of clean power going to this sub and it can take more no problem. If you are a bass head this sub destroys a lot of other brands on the market and is worth every penny and is equivalent to the exo line from ct sounds but half the price and all of the power and quality. ... show more
Reviewed in the United States on May 31, 2024 by Jamie munger

Dumpers ! Recommended
Size: 1 Ohm Style: Two Pack
They sure do dump. Straight dumpers. Do to be knowledge i was only able to hook up one to a 4 channel mono block. And just the one speaker hits so hard . I can here my durango coming from a mile away . I recommend these speakers. Cant wait to hook them both up ! Im impressed. 2400 watt quantum audio . Bridge mono block 4 channels . Running on 2 channel. With a 3rd 750 watt alpine bass. Wakes up the neighbors just fine 😎 ... show more
Reviewed in the United States on March 26, 2022 by Jacob Brooks

This thing slaps
Size: 1 Ohm Style: Single Pack
I was very indecisive about this sub because it was not a well known name brand and had no videos or not very many reviews. But I took the chance and this thing is amazing had it about 3-4 months and it hits hard every time needs a lot of air has beefy high temp voice coil with black glue huge motor and nice kinda stiff surround I have it on a 1800watt taramps turned all the way up and it sounds amazing ... show more
Reviewed in the United States on June 22, 2021 by Colby

Dual Harmony Audio Monoliths 12d1 Subs
Size: 1 Ohm Style: Two Pack
Bought two 12d1 monoliths after months of research on them I decided to give them a try!!! OMG!!! So glad I decided to try them they are by far some of the best subs I’ve owned and I have plenty of them… I am not going to name bash anyone but with 100% certainty I would put them up against any sub in its class ! In the correct enclosure these subs are hard to beat , just try me ! I’m really blown away by the monolith subs THEY ARE BUILT LIKE TANKS without a doubt. ... show more
Reviewed in the United States on May 10, 2026 by George hughes

There awesome subs well worth the 300$
Size: 1 Ohm Style: Single Pack
I wrote a review a few months ago when I first got one so now is the 6 month update. I love these bad boys!!! They def hit hard has hell in every box I’ve put em in. I’m doing a custom bench in back of my f150 with 4 of these and two hifonics colusses 6000 watt amps. I’m jus waiting on my other sub now and it’s going in. I can’t wait!!! But def worth the money compared to sundown and dc audio. It was a toss up because I heard Skar is good to but I went with these and I’m glad I did. Very sturdy construction good motor nice stiff sub but not to stiff and spider is big so it flexes more than the others. ... show more
Reviewed in the United States on April 4, 2020 by mike j Jones

Great bargain!
Size: 1 Ohm Style: Two Pack
These subs are bulletproof and sound great. To the guy that had the basket break, when you make the hole too small and you force the subwoofer in there, of course it's gonna be under pressure and crack at the weakest point. I don't fault the manufacturer for that but the user that put them in too small of a hole It put undue force on those thinner parts of the frame at the upper part of the basket... ... show more
Reviewed in the United States on December 12, 2022 by ndtforlife
Checking for best price...