Used Funktion-One F121
Used Funktion-One F121 subwoofers are professional 21-inch point source speakers delivering a 20Hz to 200Hz operating bandwidth and 750W AES power handling, suited to live events, clubs and fixed installations. Available as second-hand units, the F121 is a well-regarded choice for demanding low-frequency applications across touring, corporate events, theatre and houses of worship. Scroll down to browse used Funktion-One F121 listings currently available on 10K Used.
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Funktion-One F121 specifications
| Brand | Funktion One |
| Segment | Audio |
| Speaker Type | Point Source |
| Active or Passive | Active |
About the Funktion-One F121
The Funktion-One F121 is a professional 21-inch subwoofer built for concert touring, corporate events, education, theatre, houses of worship, clubs and fixed installations. It operates across a bandwidth of 20Hz to 200Hz with a sensitivity of 101dB at 2.8V, a nominal impedance of 8 ohms and a maximum power handling of 750W AES. At 72kg the cabinet is a substantial, solid unit. The F121 is designed to deliver profound bass response and consistent low-frequency clarity, making it a practical choice wherever powerful, reliable subwoofer performance is required.
Funktion-One F121 — buyer FAQs
What is the Funktion-One F121 and what is it designed to do?
The Funktion-One F121 is a professional 21-inch subwoofer built to reproduce low frequencies from 20Hz to 200Hz. It handles up to 750W AES and has a nominal impedance of 8 ohms, with a sensitivity of 101dB at 2.8V. Its intended applications include live events, clubs, concert touring, theatre, corporate events, education and fixed installations where consistent, high-output bass performance is needed.
Who makes the F121 and where does it fit in their range?
The F121 is made by Funktion-One, a British loudspeaker manufacturer founded in 1992 and based in Dorking, Surrey. The brand specialises in point source loudspeakers, subwoofers and amplification, with a design philosophy centred on efficiency and clarity. The F121 sits within that subwoofer line, targeting demanding professional environments including clubs, festivals and touring productions.
What venues and applications is the used Funktion-One F121 suited to?
The F121 is suited to a broad range of professional audio environments. Its stated applications include concert touring, clubs, live events, corporate events, theatre, education and houses of worship, as well as permanent installations. The combination of a 21-inch driver, 750W AES power handling and a 20Hz to 200Hz bandwidth makes it practical wherever substantial, controlled low-frequency output is required.
How much does a second-hand Funktion-One F121 cost?
Used F121 prices vary depending on condition, age, and whether accessories such as wheels and grills are included. Units are available priced per piece or occasionally as pairs. Check the live listings on this page for current asking prices, as stock and pricing change regularly.
What should I check when buying a used F121?
Inspect whether the unit includes its wheels and grills, as these affect transport and setup. At 72kg the cabinet is heavy, so checking the condition of any handles or castors is worthwhile. Verify the driver and cabinet show no damage. Used listings on 10K Used carry a 21-day warranty covering major functional faults, and further detail is in the buying guide at 10kused.com/used-av-equipment-guide/.
