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MAG Theatron SB21

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Original price £2,200.00 - Original price £2,200.00
Original price
£2,200.00 - £2,200.00
Current price £2,200.00


  • Components: 21″
  • Frequency range: 28 – 300 Hz
  • Max continuous SPL: 131 dB
  • Power rating: 1600 W

SB21 is a high-performing subwoofer created to deliver a powerful immersive cinema experience into your home theater. This highly sensitive 21” subwoofer is only 400mm (15.7 inches) deep, conveniently saving so much needed space behind the screen area. Large vents are located on both sides of the cabinet, reducing the turbulence noises and preventing any screen movement by the airflow.

Performance series subwoofers are made as slim as physically possible to assist in installation into the tightest space behind the screen. With vents placed at the sides of the cabinet, the danger of the screen being moved by an air stream is also eliminated.

Specially designed transducers are packed with technologies to reduce distortion and increase reliability, including the Double Demodulation Ring and Triple Voice Coil Cooling System.

Technical Data

Frequency response (±3 dB), Hz 31 – 150
Frequency range (-10 dB), Hz
28 – 300
Max continuous SPL, dB 131
Sensitivity (1W/1m, half-space), dB 99
High-frequency driver 21-inch (4,5-inch voice coil) ridged glass-fiber reinforced cone
Nominal impedance, Ohm 4 / 8
Power rating, W 1600
Mounting 4 x M10 mounting points
2 x M10 safety points
Connectors Phoenix terminals
Dimension (WxHxD), mm 1135 x 850 х 400
Net weight, kg


* dB SPL, IEC 60268-5 pink noise, 1W / 1m, half- and free- space
** dB SPL RMS, IEC 60268-5 pink noise, measured on nominal power
*** 2-hour power test, IEC filtered noise, 6 dB crest factor

Specification and Drawings

Delivery time

2-3 weeks

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