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Ships within 48 hours · Estimated delivery Aug 22 - Aug 27
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Description
Massive Audio TKO Series 12" SubwooferBass can be an emotional connection to the music. But, you want to make a logical choice when it comes to subwoofers. Above a starter sub, while not needing gobs of power, our Massive Audio TKO124 12S4 slots right in perfectly. A proven design that for years, has provided many installs with deep bass that really brings out the entire song. At the same time, bringing great value to all of those people wanting great performance from the low notes. The
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.8 ★★★★★
Based on 1350 reviews
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Product Reviews
★★★★★ 4
Faulty plug? Otherwise great set
Definitely better than the old plugs that probably had 80k miles on them.
The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine.
Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Upgrade from OEM
After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is.
These were an upgrade from OEM parts. They were gapped perfectly for the car.
They took 20mins to fit and work fine.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
Very good
The best quality. Runs like new again.
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Reviewed in the United States on March 12, 2026
★★★★★ 1
garbage spark plugs
misfired after 30 minutes of driving cylinder 4 misfire code, left me stranded on the highway with baby in car. “(9621)” at the end of description is a lie, was not compatible with my vehicle even with compatibility test.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Fits 2011 335xi n55 prefect
Fits my 2011 335xi n55 engine perfectly. Comes on and off easily and gets the filter loose quickly. Amazing quality
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Reviewed in the United States on March 15, 2026
