• BASSO21_highangleR
  • BASSO21_highangleL
  • BASSO21_left
  • BASSO21_rear


21" Direct Radiation Multipurpose Subwoofer

Compact 21" subwoofer, with high output linear response from to 25Hz, for portable professional sound reinforcement systems and very deep LF demanding installations. Designed to operate as an “Infra” VLF extension of the rest of the BASSO Series subwoofers as well as a stand-alone subwoofer, ideal for the reproduction of deep-bass-heavy music styles and for AV and Broadcast applications.


Many key factors are to be considered when configuring the subwoofer section of a loudspeaker system to perfectly match each application: size/weight, logistic and operational setups, SPL needs, LF extension, cost limitations, as well as sound engineer preferences (depending on different the type and size of the event) or audio program characteristics and regional style taste for subwoofer mixes.
BASSO Series models allow the user to choose the most adequate subwoofer for any given situation from within a family of products with common finish, design solutions and performance philosophy as well as shared rigging and transport accessories.
BASSO21 is a high-density single 21″ direct radiation subwoofer that delivers a very natural, linear response in the VLF range from 25 Hz up to 140 Hz. Built with 21″ Premium birch plywood and fitted with a 2 mm steel grille, this medium format medium format cabinet is finished with IDEA Aquaforce weatherized coating to endure life on the road or stylishly integrate in any installation.
BASSO21 seamlessly matches with 2-way loudspeakers in LUA and EXO Series maximizing the high-density performance of these systems for a wide range of portable, mobile and install professional sound reinforcement applications, from high power club sound systems and medium size live music events to rental and touring companies.
BASSO21 can be (on demand) served with BASSO rigging structures, allowing for stacked and flown configurations.


  • Rugged and durable 18 mm birch plywood construction and finish
  • Bass reflex design with 5th order tuning
  • Premium European High Efficiency custom IDEA Transducers
  • 8 Ohm Passive
  • Dual Neutrik NL4 connectors
  • Durable Aquaforce paint, available in standard textured black or white, optional RAL colors (on demand)
  • Turn-key Factory Amplifier/DSP dedicated configurations
  • 36 mm pole cup and four integrated handles
  • Compatible rigging accessories (optional) for stacked and flown configurations with VOA systems


  • High SPL A/V, portable professional sound reinforcement and touring
  • Main or distributed subwoofer system in Pubs, Lounges, Bars and clubs
  • Infra extension to other BASSO series subwoofers
  • Broadcast Studios and Screening rooms


Enclosure design Bass Reflex
Transducers 21”
Power Handling (RMS) 1.5 kW
Nominal Impedance 8 Ω
SPL (Continuous/Peak) 132/138 dB SPL
Frequency Range (-10 dB) 25 – 80/100/120/140 Hz
Frequency Range (-3 dB) 30 – 65/80/100/120 Hz
Dimensions (W×H×D) 600 × 600 × 950 mm
Weight 70 kg
2 × Neutrik speakOn NL-4 in parallel
Cabinet Construction 18 mm Plywood
Grille 2 mm perforated weatherised steel with protective foam
Finish Durable IDEA proprietary Aquaforce paint coating process
Handles 4 integrated handles
Feet/Skates 4 rubber feet
Installation 36 mm Pole mount socket
Accessories Riggin Frame (RF-600)
Riggin System (RS-BASSO-L)
Wheels (WH-04)
35 mm Pole (K&M-21336)

* Specifications may be subject to change without notice.


Spare Parts

  • S21-41-8 | Woofer 21″
  • R-S21-41-8 | Membrane for Woofer 21″