10 Inch (250 mm), 4 Ohm Dual Voice Coil Subwoofer

Brand Name
Red Line
Model #
Part #
In stock

This Red Line subwoofer is designed for car or home audio, featuring a rigid black powder coated cast aluminum basket, a treated pulp cones with a polyether foam surround, and comes with a decorative rubber trim ring which aids enclosure sealing. Its dual voice coil 200-watt subwoofer is designed to use the energy from both the left and right channels simultaneously.

  • Subwoofer
  • 10" (250 mm) basket diameter
  • 100 watts, 4 ohms, 88 dB SPL
  • 2" copper voice coil, aluminum former
  • Ferrite magnet, die cast aluminum basket
  • Engineered Abaca fiber cone, polyether foam surround

MISCO engineers test and analyze the performance of these speakers using the world's most sophisticated loudspeaker measurement systems including the Klippel Analyzer and the Klippel QC, which are used to validate final design. 

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More Information
Brand Name Red Line
Model # 250-SW04D-01
Size, Nominal (inch & mm) 10" (250 mm)
Shape of Speaker Round
Speaker Type Subwoofer
Application Auto / Motorcycle, High-End Audio and Home Theater, Home Audio
Environment Indoor
RoHS Compliant Yes
Nominal Impedance (Z) (Ω) 4 + 4
Rated Power IEC268-5 (W) 100 Watts
Rated Impedance (Ω) 4 + 4
Continuous Power (W) 100
Program Power (W) 200
Frequency Range (Hz) 20 - 200
Sensitivity (dB SPL) ¹ 88
Resonant Frequency (Fs) (Hz) +/- 15% 31
DC Resistance (Re) (Ω) 1.9
Voice Coil Inductance (Le) (mH) 24.81
Mechanical Q Factor (Qms) 6.96
Electrical Q Factor (Qes) 0.39
Total Q Factor (Qts) 0.37
Mechanical Resistance (Rms) (kg/s) 2.94
Compliance Equivalent Volume (Vas) (L) 39.27
Suspension Compliance (Cms) (mm/N) 0.26
Surface Area of Diaphragm (Sd) (cm²) 330.1
Moving Mass (Mms) (gm) 106.6
Magnetic Gap Height (mm) 9.5
Coil Winding Height (mm) 40.3
Maximum Linear Excursion (Xmax) (mm) 15.4
Motor Force Factor (BL) (T•M) 9.9
Efficiency (η₀) (%) 39.27
Efficiency Bandwidth Product (EBP) (Fs/Qes) 77.7
Basket Type Die cast aluminum basket with black powder coat finish
Terminal Size (mm) Knurled push style spring connectors
Voice Coil Diameter (mm) 51.3
Voice Coil Wire Material Round copper wire
Voice Coil Former Material Aluminum
Voice Coil Winding Dual winding, four layers total
Magnet Material Ferrite
Magnet Weight (g) 2166
Cone Body Material Abaca fiber with wet look treat
Cone Surround Material Heavy-duty polyether foam
Dust Cap Material Inverted engineered paper dome
Spider Material Durable polycotton
Net Weight (kg) 5.37
Technical Notes

¹ Sensitivity is measured with 2.83 volt input, measured on-axis at 1 meter distance