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Used Fohhn Audio XS-4 active / passive
Speakers
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Used Fohhn Audio XS-4 active/passive is a single 18-inch subwoofer built for precise low-frequency reproduction, a high power rating and versatile deployment across live and installed sound applications. Available in both an amplified version with a 1500 W class-D amplifier and built-in DSP, and a passive 800 W variant, the second-hand XS-4 suits a wide range of professional setups. Scroll down to explore the used Fohhn Audio XS-4 listings currently available.
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Fohhn Audio XS-4 active / passive specifications
| Brand | Fohhn Audio |
| Segment | Audio |
About the Fohhn Audio XS-4 active / passive
The Fohhn Audio XS-4 active/passive is a single 18-inch subwoofer characterised by precise low-frequency reproduction, a high power rating and versatility. The active version houses a 1500 W class-D amplifier alongside Fohhn DSP, offering speaker presets, EQ, delay and compressor/limiter functionality, plus two balanced XLR/jack inputs with link-out and two Speakon outputs for passive tops or an additional sub. It is designed to support speakers in the Fohhn X, Linea, Arc and Focus series. The passive variant delivers an 800 W power rating with four Speakon connections. Both versions share an 18-inch long-excursion driver, a 132 dB maximum SPL, a multiplex birch plywood enclosure and a steel ball-impact-resistant grille, with dimensions of approximately 590 x 600 x 680 mm and a weight of around 39 kg.
Fohhn Audio XS-4 active / passive — buyer FAQs
What is the Fohhn Audio XS-4 and what are the key differences between the active and passive versions?
The Fohhn Audio XS-4 is a single 18-inch subwoofer designed for precise low-frequency reproduction. The active version houses a 1500 W class-D amplifier with built-in DSP, two balanced XLR/jack inputs with link-out, and two Speakon outputs for passive tops or an additional sub. The passive version has an 800 W power rating and four Speakon connections. Both share an 18-inch long-excursion driver, 132 dB maximum SPL, and a multiplex birch plywood enclosure weighing around 39 kg.
Which speaker systems is the XS-4 active designed to support?
The XS-4 active is designed to provide bass support to speakers in the Fohhn X, Linea, Arc and Focus series. Its two Speakon outputs allow it to drive passive tops or an additional subwoofer directly from the unit, making integration with these series straightforward without a separate amplifier for the sub.
What DSP features are built into the XS-4 active?
The XS-4 active includes Fohhn DSP with speaker presets, EQ, delay, and compressor/limiter functions. Settings can be adjusted via an onboard control panel with a display or through Fohhn Audio Soft software. This removes the need for a separate processing unit when the sub is used as part of a Fohhn system.
What should I check when buying a used Fohhn Audio XS-4?
Check whether the unit is the active or passive variant, as they differ significantly in power rating and connectivity. For the active version, confirm the amplifier and DSP operate correctly. Inspect the birch plywood enclosure and steel grille for structural damage, and verify that all Speakon connections and XLR inputs function. Used listings on this page vary by configuration and condition, both of which affect price. Each 10K Used listing carries a 21-day warranty covering major functional faults; full detail is in the buying guide at 10kused.com/used-av-equipment-guide/.
Who makes the XS-4 subwoofer?
The XS-4 is made by Fohhn Audio, a brand whose product range includes the X, Linea, Arc and Focus speaker series, with the XS-4 sitting in the sub category as a dedicated bass unit designed to complement those systems. The XS-4 is offered in both active and passive forms, covering amplified and non-amplified professional audio installations.
