Reckhorn D-250

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 22Hz
• Mechanical quality factor QMS 4.26
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 13mm
• Air volume displaced at xmax VD 429cm³

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.8Ω
• Inductance (1kHz) LE 2.32mH

Magnet

• Force factor Bl 11.4N/A
• Motor constant Bl/√RE 5.83N/√W

Diaphragm

• Effective diameter 205mm
• Effective area SD 330cm²
• Moving mass MMS 88g
• Moving mass (without air load) MMD 83.6g

Suspensions

• Stiffness KMS 1.67N/mm
• Compliance CMS 600µm/N
• Equivalent volume to the compliance VAS 91L
• Mechanical resistance RMS 2.85N·s/m

Dimensions

• Nominal diameter 10″
• 250mm
• Overall diameter 260mm
• Baffle cutout diameter 230mm
• Overall depth 145mm
• Flange thickness 8mm
• Mounting depth 137mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 5.1kg