Tectonic BMR85R12-4A

8Ω

Full-range

Nominal diameter4″ / 100 mm
Resonance220 Hz
Q factor1.20
Sensitivity81.5 dB
Linear excursion± 1.1 mm
Program Power24 W
Tectonic BMR85R12-4A Full-rangeTectonic BMR85R12-4A Full-range
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply

Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 81.5dB
  • Frequency response 200 - 20000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 220Hz
  • Mechanical quality factor QMS 2.50
  • Electrical quality factor QES 2.28
  • Total quality factor QTS 1.20

Large signal parameters

  • Maximum linear excursion xmax 1.1mm
  • Maximum excursion before damage xlim 2mm
  • Air volume displaced at xmax VD 2.3cm³
  • Power handling P 12W
  • Program power Pmax 24W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 4.2Ω
  • Inductance (1kHz) LE 0.053mH
  • VC Diameter 22.2mm
  • Winding material Copper Clad Aluminium

Magnet

  • Force factor Bl 2.62N/A
  • Motor constant Bl/√RE 1.27N/√W
  • Material Neodymium

Diaphragm

  • Effective diameter 51mm
  • Effective area SD 20.5cm²
  • Moving mass MMS 2.67g
  • Moving mass (without air load) MMD 2.6g
  • Material Paper

Suspensions

  • Stiffness KMS 5N/mm
  • Compliance CMS 200µm/N
  • Equivalent volume to the compliance VAS 0.119L
  • Mechanical resistance RMS 1.46N·s/m

Dimensions

  • Nominal diameter 4″
  • 100mm
  • Overall size 32 x 100mm
  • Mounting baffle cutout 29 x 90mm
  • Overall depth 28mm
  • Volume occupied by the driver 0.02L
SPL & Impedance
Force factor
Stiffness
Tectonic BMR85R12-4A SPL & Impedance
Tectonic BMR85R12-4A Force factor
Tectonic BMR85R12-4A Stiffness
Tectonic BMR85R12-4A Dimensions
PDF fileDatasheet

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