Morel Ultimate UW 1258

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 21Hz
• Mechanical quality factor QMS 1.88
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 12.5mm
• Air volume displaced at xmax VD 546cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 1.33mH
• VC Diameter 130mm
• Winding height HVC 37mm
• Winding material Hexatech™ Aluminum
• Former material Aluminum

Magnet

• Flux density B 0.64T
• Force factor Bl 13.7N/A
• Motor constant Bl/√RE 5.24N/√W
• Air gap height HAG 12mm
• Material High flux double ferrite vented

Diaphragm

• Effective diameter 236mm
• Effective area SD 437cm²
• Moving mass MMS 105g
• Moving mass (without air load) MMD 98.6g
• Material Composite cellular fiber

Suspensions

• Stiffness KMS 2.27N/mm
• Compliance CMS 440µm/N
• Equivalent volume to the compliance VAS 138L
• Mechanical resistance RMS 8.15N·s/m

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 305mm
• Baffle cutout diameter 270mm
• Overall depth 154mm
• Flange thickness 6mm
• Mounting depth 148mm
• Volume occupied by the driver (estimated) 2.8L
• Net weight 6.3kg