SEAS RM 120 L0021-04S

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.2dB
• Frequency response 300 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 72Hz
• Mechanical quality factor QMS 2.95
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 1.7mm
• Air volume displaced at xmax VD 8.5cm³
• Power handling P 110W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 0.25mH
• VC Diameter 26mm
• Winding height HVC 9.4mm

Magnet

• Flux density B 1.1T
• Force factor Bl 4N/A
• Motor constant Bl/√RE 2.31N/√W
• Air gap height HAG 6mm
• Weight 0.42kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 4.55g
• Moving mass (without air load) MMD 4.3g

Suspensions

• Stiffness KMS 0.909N/mm
• Compliance CMS 1100µm/N
• Equivalent volume to the compliance VAS 4L
• Mechanical resistance RMS 0.73N·s/m

Dimensions

• Nominal diameter 4.5″
• 120mm
• Volume occupied by the driver (estimated) 0.52L
• Net weight 1.3kg