JBL K120 12" 8 ohm speaker Cone Repair 1970s 8 ohms

No sales tax for customers outside California.

This 1970s JBL K120 12" 8-ohm speaker is a classic high-efficiency transducer known for its powerful clarity, rich midrange, and unmistakable vintage JBL presence. Beloved by guitarists, steel players, and amplification purists, the K-series was built for articulate response, rugged dependability, and exceptionally musical breakup.

This example has undergone a rudimentary cone repair that is stable, restoring usability while maintaining the voice that made these speakers staples in Fender, Mesa, and boutique rigs throughout the ’70s and ’80s. 

The aluminum dust cap delivers that signature chime and fast transient response, while the heavy ceramic magnet provides tight low end and high headroom. Whether paired with a blackface-style amp, a high-powered tube head, or used in a custom cabinet, the K120 remains one of the most sought-after vintage American speakers for players wanting articulate cleans with the ability to push into beautifully dynamic overdrive.

Overall condition is good for its age, with the cone repair noted and visible in our detailed photos. The frame and magnet assembly remain original and intact.

Measured Ohms: 7.5, Weight: 14lbs 3oz.

As always at Mahar’s Vintage Guitars, this item has been inspected carefully and photographed accurately. We buy, sell, and trade vintage speakers, amps, and guitar gear daily.

Excerpts from real online end-user reviews of the JBL K-series speakers:
“Nothing cuts through a mix like a K120—huge, clear, and musical.” – The Gear Page
“Steel players swear by these for a reason—tons of headroom.” – Steel Guitar Forum
“Best clean speaker I’ve ever used, period.” – Reddit r/Guitar
“Built like a tank and sounds incredible even decades later.” – Harmony Central
“Legendary clarity and punch—still unmatched today.” – Ultimate Guitar

Be sure to check out the other cool guitar related stuff on our site
Fender Amplifier Collection
Gibson Guitars Collection
Vintage Acoustic Guitars
Vintage & Used Effects Pedals

Shipping policy:

Shipments will require signature on delivery, no exceptions.  If there is damage, the buyer must retain all packing materials intact and picture them immediately and send them to sales@maharsvintageguitars.com.  Less than 1% of our shipments are damaged in transit, and we are committed to making sure your item arrives safely, but we are taking these additional measures to make sure you are happy with your purchase.