CSW221

Dual 21″ Dominance.

Portable Subwoofers CSW

Where to buy

Description

The undisputed flagship of low-end supremacy—the CELTO CSW221 unleashes a staggering 3600W RMS (14400W peak) with clean, profoundly deep bass that extends effortlessly down to 28 Hz. This dual 21" high-performance vented subwoofer outperforms conventional dual 18" designs, delivering superior SPL and authority in a surprisingly manageable footprint. Engineered for the most demanding main PA reinforcement in stadiums, festivals, arenas, large theatres, nightclubs, and top-tier touring or permanent installations—indoors or out. Twin premium custom CELTO 21SW2000 drivers with massive 4.5" long-throw voice coils and DCS cooling ensure relentless excursion, control, and thermal stability under extreme conditions. Heavily braced birch plywood cabinet with tongue-and-groove construction remains utterly vibration-free, even when pushed to seismic levels. Boasting 102 dB sensitivity and a calculated 143 dB peak SPL, it transforms amplification into earth-shattering impact with remarkable efficiency. Dual M20 threaded sockets and genuine Neutrik Speakon connectors facilitate easy stacking, pole-mounting, and seamless system integration. Touring-grade textured waterborne gloss-free black finish, with optional padded bag, crank pole bar, and heavy-duty castor kit for rapid, road-proof deployment. The CSW221 proves that true flagship bass doesn't just move air—it redefines the laws of physics, one chest-compressing note at a time.

Key Features

Real 3600W RMS power capacity
Clean and deep reproduction from 25Hz to 95Hz
Replaces universal dual 18s with added SPL
Premium custom CELTO Driver
Heavy braced, vibration free birch plywood cabinet
Touring grade gloss-free black painting

Applications

Portable Professional sound, on demand

Technical specifications

Speaker type	Multi-purpose vented Subwoofer
Power Handling (AES standard)	3600 W RMS / 14400 W Peak
Nominal impedance	4Ω
Average sensitivity	102 dB / 1 W / 1 m
Maximum SPL (calculated)	137 dB RMS / 143 dB Peak
Frequency response (-6 dB no preset)	28~1000 Hz
Nominal directivity (-6 dB)	Omni in usable range
Cabinet	Exterior grade Birch Plywood Heavily braced with Tongue & Groove
Cabinet finish	Textured Waterborne Black coating Acoustic PU foam behind Front grill
Flying hardware	No
Mounting hardware	2pcs M20 thread socket
LF	2x 21" CELTO 21SW2000-8
Woofer Chassis	Die Cast Aluminium
Woofer Voice coil	4.5" / 115 mm long throw
Crossover	No, active mode only
Connectivity	Genuine NEUTRIK 2pcs Speakon NL4MP
Speaker size (HxWxD)	588 x 1 226 x 805 mm
Speaker Weight	99 kg
Shipping information	112 kg 710 x 1 380 x 915 mm
Accessories	CSW221-SBAG (padded cover bag) CPC-70 (pole bar with crank) SUBWHKIT100C (castor wheel kit)

Product files

Name	Category	Type	Size
CELTO_CSW221_A0_20250717_WEB_CAD CELTO_CSW221_A0_20250717_WEB_CAD	CELTO_CSW221_A0_20250717_WEB_CAD	PDF	105.2 KiB	Download
CELTO_CSW221_A0_20250717_WEB_CAD CELTO_CSW221_A0_20250717_WEB_CAD	CELTO_CSW221_A0_20250717_WEB_CAD	DWG	1.5 MiB	Download