Beyma SM-115N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.5dB
• Frequency response 35 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 8.50
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 7.3mm
• Maximum excursion before damage xlim 15mm
• Air volume displaced at xmax VD 638cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.4Ω
• Inductance (1kHz) LE 1.2mH
• VC Diameter 77mm
• Winding height HVC 17.5mm

Magnet

• Force factor Bl 17.4N/A
• Motor constant Bl/√RE 6.88N/√W
• Air gap height HAG 7mm
• Material Ferrite

Diaphragm

• Effective diameter 335mm
• Effective area SD 880cm²
• Moving mass MMS 86g
• Moving mass (without air load) MMD 68.4g

Suspensions

• Stiffness KMS 4.12N/mm
• Compliance CMS 243µm/N
• Equivalent volume to the compliance VAS 267L
• Mechanical resistance RMS 2.2N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Volume occupied by the driver (estimated) 2.9L
• Net weight 6.5kg