Hertz Uno S 300 S4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.2dB

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 7.80
• Electrical quality factor QES 0.65
• Total quality factor QTS 0.60

Large signal parameters

• Maximum linear excursion xmax 9.1mm
• Maximum excursion before damage xlim 15.1mm
• Air volume displaced at xmax VD 478cm³
• Power handling P 250W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz, estimated) LE 1.85mH
• VC Diameter 38mm

Magnet

• Force factor Bl 11.3N/A
• Motor constant Bl/√RE 5.96N/√W
• Diameter 134mm
• Height 34mm
• Material Ferrite

Diaphragm

• Effective diameter 258mm
• Effective area SD 525cm²
• Moving mass MMS 112g
• Moving mass (without air load) MMD 104g
• Material Painted Pressed Paper Pulp

Suspensions

• Stiffness KMS 4.76N/mm
• Compliance CMS 210µm/N
• Equivalent volume to the compliance VAS 82.2L
• Mechanical resistance RMS 2.98N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 307mm
• Baffle cutout diameter 280mm
• Overall depth 128mm
• Flange thickness 7mm
• Mounting depth 121mm
• Volume occupied by the driver (estimated) 1.6L
• Net weight 3.0kg