Hertz DS 250.3

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.6dB
• Frequency response 32 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 36Hz
• Mechanical quality factor QMS 6.35
• Electrical quality factor QES 0.69
• Total quality factor QTS 0.62

Large signal parameters

• Maximum linear excursion xmax 10mm
• Maximum excursion before damage xlim 17mm
• Air volume displaced at xmax VD 369cm³
• Power handling P 200W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 1.33mH
• VC Diameter 50mm

Magnet

• Force factor Bl 11.8N/A
• Motor constant Bl/√RE 6.4N/√W
• Material High Density flux ferrite

Diaphragm

• Effective diameter 215mm
• Effective area SD 369cm²
• Moving mass MMS 120g
• Moving mass (without air load) MMD 115g
• Material Polypropylene with Mica injection

Suspensions

• Stiffness KMS 6.67N/mm
• Compliance CMS 150µm/N
• Equivalent volume to the compliance VAS 29L
• Mechanical resistance RMS 4.27N·s/m

Dimensions

• Nominal diameter 10″
• 250mm
• Volume occupied by the driver (estimated) 1.5L