Down4Sound SB8D2

2x2Ω

Subwoofer

Nominal diameter	8″ / 203 mm
Resonance	37.1 Hz
Q factor	0.49
Sensitivity	81.3 dB
Linear excursion	± 21 mm
Program Power	1000 W

Down4Sound SB8D2 Subwoofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 81.3dB

Thiele & Small parameters

Resonance frequency (free air) fS 37.1Hz
Mechanical quality factor QMS 3.10
Electrical quality factor QES 0.58
Total quality factor QTS 0.49

Large signal parameters

Maximum linear excursion (one way) xmax 21mm
Air volume displaced at xmax VD 441cm³
Power handling P 500W
Program power Pmax 1000W

Voice Coil

Nominal impedance Z 2 x 2Ω
DC resistance (in series) RE 3.8Ω
Inductance (1kHz, in series, estimated) LE 2.1mH
VC Diameter 63.5mm

Magnet

Force factor (in series) Bl 14.2N/A
Motor constant Bl/√RE 7.27N/√W

Diaphragm

Effective diameter 164mm
Effective area SD 210cm²
Moving mass MMS 125g
Moving mass (without air load) MMD 123g

Suspensions

Stiffness KMS 7.16N/mm
Compliance CMS 140µm/N
Equivalent volume to the compliance VAS 9.02L
Mechanical resistance RMS 9.39N·s/m

Dimensions

Nominal diameter 8″
203mm
Volume occupied by the driver 1.98L

Export this driver to a simulation software:

Closed Box Simulator·

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