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RCF LF21X451 21-inch, 4000W, 8 Ohm Bass Woofer

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Recommended price £638 -19%
£515 incl. 20% VAT
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Bax-shop.uk | ALPHATHETA XDJ-AN
RCF LF21X451 21-inch, 4000W, 8 Ohm Bass Woofer
Product no: 9000-0106-1524

Product information

General

The incredibly advanced RCF LF21X451 LF-driver has an extreme linear response and an impressive level of resilience. This 21 inch bass woofer features an 8 Ohm impedance and 4,000 Watt program power handling. For full technical details, see the specifications below.

Bax Music Warranty This product comes with a 3-year warranty.

Specifications

Product features

Sustainable product
Not specified
Type of speaker
Subwoofer
Minimum frequency
25 - 29 Hz
Maximum frequency
1 - 4.9 kHz
RMS capacity in watts
1,500 - 3,000 W
Peak power in watts
> 3,000 watts
Sensitivity
97 dB
Nominal impedance
8 ohms
Type of magnet
Ceramic
Weight per speaker
16 kg
Installation depth
240 - 249 mm

Weight and dimensions including packaging

Weight
18,5 kg
Dimensions
60,4 x 58,4 x 28,4 cm

Product specifications

  • nominal diameter: 21"/533mm
  • nominal impedance: 8 Ohms
  • program power: 4,000W
  • output capacity: 2,000W
  • sensitivity: 97.0dB
  • frequency range: 28Hz - 1000Hz
  • effective piston diameter: 470mm/18.5"
  • max. damage excursion: 54mm/2.13"
  • minimum impedance: 6.7
  • voice-coil diameter: 4.5"/114mm
  • voice-coil material: copper
  • voice-coil length: 34mm/1.34"
  • number of layers: 2
  • layer sort: interior, exterior
  • upper plate depth: 15mm (0.59")
  • cone design: curved
  • surround material: polycotton
  • surround design: three-double role
  • magnet: ceramic
  • air ventilation with double power: yes
  • spin: double with silicon based damping treatment
Thiele & Small
  • resonant frequency (Fs): 28 Hz
  • DC impedance (Re): 5.40 Ohms
  • mechanical factor: 6.90 Qms
  • electrical factor: 0.39 Qes
  • total factor: 0.37 Qts
  • Bl-factor (Bl): 30.50 T x M
  • effective moving mass (Mms): 355.0g
  • equivalent Cas air-loaded (Vas): 385.0 litres
  • effective piston surface (Sd): 0.170 m2
  • max. linear excursion (Xmax): 14mm
  • voice-coil induction @ 1kHz (Le1k): 2.90 mH
  • efficient at half space (Eff): 2.20%
mounting information
  • total diameter: 547mm / 21.54"
  • bolt circle diameter: 527mm / 20.75"
  • bolt hole diameter: 7mm
  • front mount bulkhead recess: 512mm / 20.16"
  • rear mount bulkhead recess: 512mm / 20.16"
  • driver volume: 6.5 litres / 0.26 ft3
dimensions and weight
  • dimensions (diameter x height): 54.7 x 24.5cm
  • weight: 15.5 kg

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