SPK-8S4

Features

• High Excursion Design for Ultra Low Bass
• Fiber Matrix Paper Cone with Mica Coating
• 3-Layer High Temp Voice Coil Former
• Dual Damping System for Linear Bass Reproduction
• Dual Dust Cap System for Enclosure Compression Control
• Efficient Heavy-Duty Motor Design
• Removable Subwoofer Grille Included

Small parameters

Nominal Impedance (Z) 4 ohms

DC Resistance (Re) ]] 3.2 ohms

Resonance Frequency (Fs) 60.3665 Hz

Piston Area (Sd) 0.0194 m2

Force Factor (BL) 11.3310 T.m

Mechanical Q Factor (Qms) 5.4933

Electrical Q Factor (Qes) 0.8733

Total Q Factor (Qts) 0.7535

Sensitivity 1W/M (SPL) 81.9876

Mechanical Comp (Cms) 0.0752 mm/N

Moving Mass (Mms) 92.3784 g

Linear Excursion (Xmax) . 8.5 mm

Volume Acoustic Comp (Vas) 3.9378 Ltr/ 0.1390 Cu ft

Reference Efficiency (NO.) 0.0952%

RMS Power (Pe) 350 Watts

Frequency Response 30-500 Hz

Voice Coil Diameter 2.0 in/50.8 mm

Displacement 0.05 cu ft/ 1.44Ltr

Dimensions

• Dimensions: 23.00″ W × 11.50″H × 12.00″D
• Cut Out Diameter: 7.25 in/ 184 mm
• Mounting Depth: 4.291in/ 109 mm
• Mounting Height (w/o Grille): 0.55in / 14mm
• Mounting Height (w/ Grille): 1.18in / 30mm
• Motor Diameter (w/ Cover): 5.55in / 141mm

Ported enclosure

• External Dimensions: 23.00″ W × 11.50″H × 12.00″D
• Net Internal Volume: 0.89 ft3
• Total Internal Volume: 1.22 ft3
• Gross External Volume: 1.84 ft3
• Material Thickness: 0.75″
• Tuning Frequency: 40 Hz
• Port Area” 17.50 inch2
• Port Inlet: 1.75″W× 10.00″H
• Port Length: 28.00″
• F3 (Hz): 34

Sealed enclosure

• External Dimensions: 14.50″ W × 10.00″H × 10.00″D
• Net Internal Volume: 0.49 ft3
• Total Internal Volume: 0.54 ft3
• Gross External Volume: 0.84 ft3
• Material Thickness: 0.75″
• F3 (Hz): 69.04
• Qtc: 0.86

*Enclosure size recommendations do not include driver and/or port displacement