Peerless BMR85DD NA8Y

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.7dB
• Frequency response 20 - 12000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 86.8Hz
• Mechanical quality factor QMS 3.47
• Electrical quality factor QES 0.99
• Total quality factor QTS 0.77

Large signal parameters

• Maximum linear excursion xmax 0.7mm
• Air volume displaced at xmax VD 4.8cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.6Ω
• Inductance (1kHz) LE 0.04mH
• VC Diameter 32mm
• Former material Aluminium

Magnet

• Force factor Bl 5.9N/A
• Motor constant Bl/√RE 2.14N/√W
• Air gap height HAG 4mm

Diaphragm

• Effective diameter 93mm
• Effective area SD 67.9cm²
• Moving mass MMS 8.3g
• Moving mass (without air load) MMD 7.9g

Suspensions

• Stiffness KMS 2.47N/mm
• Compliance CMS 404µm/N
• Equivalent volume to the compliance VAS 2.62L
• Mechanical resistance RMS 1.3N·s/m

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.14L
• Net weight 0.22kg