RCF LF21N401

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.2dB
• Frequency response 25 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 6.80
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 11mm
• Maximum excursion before damage xlim 30mm
• Air volume displaced at xmax VD 1903cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 1.7mH
• VC Diameter 102mm
• Winding height HVC 31mm
• Winding material Copper

Magnet

• Force factor Bl 27.6N/A
• Motor constant Bl/√RE 12.3N/√W
• Air gap height HAG 15mm

Diaphragm

• Effective diameter 470mm
• Effective area SD 1730cm²
• Moving mass MMS 318g
• Moving mass (without air load) MMD 268g

Suspensions

• Stiffness KMS 11.5N/mm
• Compliance CMS 87µm/N
• Equivalent volume to the compliance VAS 374L
• Mechanical resistance RMS 8.81N·s/m
• Spider material with silicon damping

Dimensions

• Nominal diameter 21″
• 533mm
• Overall diameter 547mm
• Baffle cutout diameter 512mm
• Overall depth 234mm
• Volume occupied by the driver 6.5L
• Net weight 9.2kg