Celto 21" Loose Speaker 2000W [21SW2000-8]

Celto 21" Loose Speaker 2000W [21SW2000-8]

The CELTO 21SW2000-8 is a high-power 21-inch bass speaker driver designed for professional sound reinforcement applications requiring deep, clean and punchy low-frequency reproduction. Featuring a 2000W RMS (AES) power handling capacity and an 8-ohm nominal impedance, this driver is suited to high-output subwoofer cabinet designs. Its extra-long excursion construction, 4.5-inch voice coil and optimised parameters make it particularly suitable for compact bass enclosure applications where powerful low-frequency performance is required. The driver combines carefully selected materials with a robust construction intended for demanding professional audio environments.

Built around a powder-coated die-cast aluminium chassis, the CELTO 21SW2000-8 features a KEVLAR®-loaded Canadian pulp paper cone with a waterproof coating on both sides. Its 240°C thermal-class copper voice coil, DUPONT® GB fibreglass former and DCS (Deflective Cooling System) contribute to its thermal management design. The dual NOMEX® spider with silicone damping and triple-roll impregnated fabric suspension support the driver's extended-excursion operation. With a sensitivity rating of 98 dB (1W/1m), a resonant frequency of 30.3 Hz and a large 1632 cm² effective cone area, this driver provides a technical foundation for professional bass enclosure projects.

Features

• 2000W RMS (AES) power handling for professional high-power bass applications

• 21-inch bass driver designed for low-frequency reproduction

• 8-ohm nominal impedance

• 4.5-inch (115 mm) voice coil with 240°C thermal-class copper winding

• Extra-long excursion design with ±13.25 mm calculated Xmax

• DCS (Deflective Cooling System) for voice coil cooling

• KEVLAR®-loaded Canadian pulp paper cone with waterproof coating on both sides

• Powder-coated die-cast aluminium chassis for structural support

• Dual NOMEX® spider with silicone damping

• Triple-roll impregnated fabric suspension

• 250 mm Y35 ferrite magnet

• Optimised parameters for compact bass cabinet designs

• 98 dB sensitivity at 1W/1m

Specifications

General

• Brand: CELTO

• Model: 21SW2000-8

• Product Type: Professional Bass Speaker Driver

• Nominal Size: 21 inches (subject to confirmation of conflicting nominal diameter specification)

• Nominal Impedance: 8 Ω

• Power Handling: 2000W RMS (AES)

• Sensitivity: 98 dB (1W/1m)

Voice Coil & Motor

• Voice Coil Diameter: 115 mm (4.5 inches)

• Voice Coil Height (Hvc): 34 mm

• Voice Coil Air Gap (Hag): 15 mm

• Calculated Xmax: ±13.25 mm

• Mechanical Excursion (Peak-to-Peak): 62 mm

• Voice Coil Winding: 2 layers, inside/outside

• Voice Coil Material: 240°C thermal-class copper

• Voice Coil Former: DUPONT® GB fibreglass

• Magnet: Ø250 mm Y35 ferrite

Cone & Suspension

• Cone Material: KEVLAR®-loaded, waterproof-treated pulp paper

• Chassis Material: Die-cast aluminium

• Suspension: Triple-roll impregnated fabric

• Spider: Dual NOMEX® with silicone damping

• Cooling System: DCS (Deflective Cooling System)

Thiele-Small Parameters

• Resonant Frequency (Fs): 30.3 Hz

• Mechanical Q Factor (Qms): 8.4

• Equivalent Compliance Volume (Vas): 281 L

• Moving Mass (Mms): 355 g

• Mechanical Resistance (Rms): 8.232 kg/s

• Effective Cone Area (Sd): 1632 cm²

• Volume Displacement (Vd): 2.448 L

• DC Resistance (Re): 5.36 Ω

• Electrical Q Factor (Qes): 0.402

• Mechanical Compliance (Cms): 0.074 mm/N

• Total Q Factor (Qts): 0.384

• Voice Coil Inductance (Le at 1 kHz): 2.20 mH

• Force Factor (BL): 30.3 (unit not specified)

• Reference Efficiency (η₀): 2.00%

Dimensions & Weight

Product

• Overall Diameter: 54.6 cm

• Overall Depth: 22.9 cm

• Product Dimensions (L × W × H): 54.6 × 54.6 × 22.9 cm (overall circular diameter used for length and width)

• Net Weight: 16 kg

Mounting Dimensions

• Bolt Circle Diameter: 51.4–52.0 cm

• Baffle Cutout Diameter: 49.4 cm

• Flange and Gasket Thickness: 1.4 cm

Packaging

• Packaged Dimensions (L × W × H): 56 × 56 × 30 cm

• Shipping Weight: 20 kg

What’s in the Box?

• 1 × CELTO 21SW2000-8 Bass Speaker Driver

Warranty

12 Months 

Some products include their own manufacturer or supplier warranty, which will be clearly indicated on the product page. Where no specific warranty is stated, your purchase is still backed by Fastrak's 7-day returns policy and your rights under the South African Consumer Protection Act.

If you're not completely satisfied, you may return the item within 7 days of delivery, provided it is unused, in its original packaging, and in resalable condition. If your item arrives damaged, faulty, or incorrect, we'll arrange collection and provide a repair, replacement, or refund in accordance with our Returns Policy.

Shipping: Orders placed online will be delivered within 3 to 5 working days (excluding weekends and public holidays). You will receive email notifications with real-time updates about your order status. Once dispatched, a waybill number will be sent to you via email.