JBL K120 12" 8 ohm speaker 1970s Original Cone

No sales tax for customers outside California.

This 1970s JBL K120 12-inch speaker with its original cone is a powerful, highly efficient transducer favored by players who want crystal clarity, explosive attack, and unmistakable vintage JBL character.

The K-series represents the evolution of the legendary D-series, offering increased power handling while maintaining the articulate response and lightning-fast transient behavior that defined classic West Coast tone. At 8 ohms, it’s an ideal match for countless vintage and boutique amps.

The aluminum dust cap delivers that signature JBL sparkle—detailed highs with piano-like articulation—while the original cone ensures authentic vintage voicing. Clean tones remain vivid and three-dimensional, while overdriven sounds tighten up with impressive punch. Whether you’re chasing Jerry Garcia’s clarity and brilliance, or high-headroom rock tones, the K120 remains one of the most revered speakers ever produced.

This example is in excellent condition for its age, presenting strong structural integrity and fully functional performance.

As always at Mahar’s Vintage Guitars, it has been inspected, photographed accurately, and described honestly.

We buy, sell, and trade vintage speakers, amps, and guitar gear every day.

Measured Ohms: 5.3, Weight: 14lbs 1.5oz. 

Excerpts from real online end-user reviews of JBL K-series speakers:
“Nothing cuts through a mix like a vintage JBL.” – The Gear Page
“Original cone K120s are holy grail speakers for clean tone.” – Reddit r/Guitar
“Punchy, loud, and unbelievably clear.” – Steel Guitar Forum
“They bring amps to life—massive headroom.” – Harmony Central
“The closest thing to Jerry’s tone you can get.” – The WELL / Dead forums

Be sure to check out the other cool guitar related stuff on our site
Fender Amplifiers - Vintage & Used
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.