RCF LF21N451

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.4dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 6.10
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 13mm
• Maximum excursion before damage xlim 29mm
• Air volume displaced at xmax VD 2210cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 3mH
• VC Diameter 114mm
• Winding height HVC 34mm
• Winding material Copper

Magnet

• Force factor Bl 34.5N/A
• Motor constant Bl/√RE 14.6N/√W
• Air gap height HAG 15mm

Diaphragm

• Effective diameter 470mm
• Effective area SD 1700cm²
• Moving mass MMS 315g
• Moving mass (without air load) MMD 266g

Suspensions

• Stiffness KMS 10.9N/mm
• Compliance CMS 92µm/N
• Equivalent volume to the compliance VAS 375L
• Mechanical resistance RMS 9.73N·s/m
• Spider material with silicon damping

Dimensions

• Nominal diameter 21″
• 533mm
• Overall diameter 547mm
• Baffle cutout diameter 512mm
• Overall depth 249mm
• Volume occupied by the driver 6.5L
• Net weight 10.9kg