Harmonic Design Infra221 3600 W hybrid passive subwoofer, 2 x 21" driver, 4 ohm
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FEATURES
High-performance subwoofer for reproducing frequencies down to 24 Hz. Exceptional power reserve with minimal distortion makes the hd Infra221 a modern and flexible tool for touring applications and installations where extreme sound pressure in the lowest frequency band and maximum control over output are required.
Two special 21" latest-generation high-performance speakers with a 40 mm linear excursion and a power handling capacity of 14,400 W are housed in a particularly rigid multi-ply cabinet, optimized with a horn-loaded bass-reflex design.
Its excellent impulse response fidelity and speed are unique for a double 21" subwoofer, making it universal, linear, and with a "brutal" impact. Compared to the most powerful hybrid horn-loaded subwoofer ever produced by Harmonic Design, the hd Infra218, the Infra221 is capable of generating over 15 dBSPL more in the low-frequency range below 28 Hz, and is therefore aimed at users who demand pressure and headroom even in the lowest octaves.
Thanks to its long throw, high efficiency, and passive directional characteristics, the hd Infra221 can be optimally integrated into large sound systems. The acoustic design allows it to be combined with all Harmonic Design satellites and, as an infra extension, with all subwoofers. A large, CFD-flow-optimized bass-reflex port in the center ensures excellent air excitation with minimal turbulence and distortion, even at maximum load.
Two M20 threads allow for horizontal and vertical operation of the tops with a spacer pole. A reversible speakON socket in the protective grille enables cardioid configurations without an interchangeable cable. It is used with all Harmonic Design system amplifiers to ensure reliable and precise bass reproduction.
Key Features
- High-performance hybrid subwoofer with 2 x 21” woofers (3600 WRMS / 14,400 W peak)
- Extended low-frequency performance from 24 Hz
- 150 dB SPL max
- Passive directivity for 3-unit stacks
- 2 x M20 threads
- Weight of 122 kg
SPECIFICATIONS
- Principle: bass-reflex system horn-loaded
- Transducers: 2 x 21″ long excursion woofer with a 5″ voice coil, vented at the pole piece and spider
- Crossover: active up to max. 110 Hz
- Power handling: 3600 WRMS / 14,400 W peak
- Frequency response: 24 – 110 Hz
- Sensitivity: 106 dB/W/m
- SPL max: 150 dB (half space)
- Nominal impedance: 4 ohm
- Enclosure: robust multiplex housing, polyurethane coating black, recessed connection panel with 2 x NL4 rear, turning socket NL4 front, 2 x M20 threads, 8 x transport handles, steel grille with acoustic foam inside
- Connections: 2 x speakON NL4, 1 x speakON NL4 turning socket
- Dimensions: 1395 x 595 x 865 mm
- Weight: 122 kg
- Options: transport protection cover, hd SlientWheels Set, weather protection and RAL color customization
Technical characteristics
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About Harmonic Design
Harmonic Design is a brand specializing in the design and production of high-performance professional sound reinforcement systems. The catalog includes full-range loudspeakers, subwoofers, stage monitors, and solutions for fixed installations and live applications, designed to ensure high intelligibility, sound pressure, and reliability even in the most demanding uses. Thanks to careful acoustic design and the use of quality components, Harmonic Design products are appreciated by audio service providers, installers, and entertainment professionals who seek high performance and precise sound reproduction. Discover the Harmonic Design range and find the sound reinforcement system best suited to your professional needs.
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Shipments
Shipments
We ship throughout Italy and the European Union via selected express courier partners. All orders travel in special reinforced packaging and are covered by 100% included insurance to fully protect the value and integrity of professional equipment during transport.
Returns and refunds
Returns and refunds
You can request a return within 14 days of receiving the order. As these are professional hardware and devices, items must be returned completely intact, unused, unactivated, and sealed in their original packaging, complete with all accessories and manuals.
Frequently Asked Questions
Can't find the answer you're looking for? Our team of specialists is at your disposal for configurations or technical questions.
What are your shipping and delivery times?
What are your shipping and delivery times?
Orders are processed within 24/48 business hours. Delivery is made by insured express courier to guarantee maximum protection and safety even for the most delicate and expensive equipment.
Are the products covered by an official warranty?
Are the products covered by an official warranty?
Yes, all products are 100% original and covered by the official 24-month manufacturer's warranty. In addition, our technical department offers free after-sales support to assist you with the initial setup of your system.
How does the right of withdrawal work?
How does the right of withdrawal work?
If the hardware does not meet your expectations, you can return it within 14 days of receipt. The product must be returned intact, unused, and sealed in its original packaging, complete with all accessories and manuals.
What does it mean if a product is "Available on order"?
What does it mean if a product is "Available on order"?
Some complex professional audio systems or lighting equipment are ordered directly from official distributors based on customer requests. You can proceed with the purchase as normal and our team will immediately inform you of the exact arrival times at our warehouses.
