ALPS-21S | MODE Audio 21" 3600W High Power Line Array Subwoofer with Italian 18SOUND LF Driver & Band-Pass Design, Flyable, Birch Plywood, Black

The MODE Audio ALPS-21S is a passive 21" line array subwoofer featuring a 21" Italian 18SOUND woofer that delivers 1800W RMS / 3600W program power at 8Ω. Its high-efficiency band-pass dual-chamber design with built-in acoustic filtering focuses low-frequency response from 35 Hz - 200 Hz, delivering high SPL output with powerful, controlled bass.

This item is available for pre-order only with an estimated lead time of at least 6–8 weeks.

The ALPS-21S is designed for both ground-stacked or flown line array configurations, supporting direct ground-stacking of up to two subwoofers. Its integrated 4-point rigging system accommodates flown installations when used with the required flying frame (sold separately). For larger configurations combining ALPS-21S subwoofers with MODE Audio ALPS-212 line array loudspeakers, a separate adapter frame is required (sold separately). These mounting options support the construction of high-density low-frequency arrays for large-scale events and touring applications. Four horizontal carry handles, with two on each side, make handling and positioning easier during setup and transport.

Constructed from durable Baltic birch plywood with a rugged DURA-COAT finish, the ALPS-21S enclosure helps minimize unwanted vibrations and distortion at high output levels. Built for electronic music festivals, nightclubs, indoor staging, and large-scale events, the ALPS-21S delivers powerful, controlled low-frequency performance for demanding sound reinforcement applications.

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• ALPS-21S PASSIVE 21" LINE ARRAY SUBWOOFER: Delivers 1800W RMS / 3600W program power at 8Ω for powerful bass and high-output low-frequency reinforcement.
• ITALIAN WOOFER & BANDPASS DESIGN: Equipped with a 21" Italian 18SOUND woofer and features a high-efficiency band-pass dual-chamber design with built-in acoustic filtering, delivering focused low-frequency response from 35 Hz - 200 Hz for outstanding SPL performance.
• BALTIC BIRCH PLYWOOD ENCLOSURE: Constructed from high-quality Baltic birch plywood with a rugged DURA-COAT finish, the ALPS-21S enclosure helps minimize unwanted vibrations and distortion at high output levels for dependable operation in demanding environments.
• STACKING & FLYING CAPABILITY: Supports direct ground-stacking of up to two ALPS-21S subwoofers. The integrated 4-point rigging system supports flown installations when used with the required flying frame (sold separately). This enables the creation of high-density low-frequency arrays for large-scale events. The ALPS-21S can also be combined with MODE Audio ALPS-212 line array loudspeakers using a separate adapter frame (sold separately).
• CARRY HANDLES FOR TRANSPORT: Four horizontal handles (two on each side) allow for easier transportation and positioning.
  

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Warranty/Certifications