, ,

Peerless by Tymphany SDS Series 830855 4″ Woofer 8 Ohm



The SDS compact woofer family offers low resonant frequency performance, ideally suited for compact sealed enclosures. This 4 inch 8 ohm member of the SDS family offer a coated paper cone with rubber surround, a high power voice coil suspended in a ferrite magnet motor, and a narrow-profile steel basket shaped to fit into narrow cabinets.

Download PDF File

2,100.00 2,500.00



Driver Size 4 in
DC Resistance 5.6 Ω ±5.0%
Resonant Frequency 63.26 Hz 15%
Half Space Sensitivity @ 2.83V 84.78 dB ±1.01
Sensitivity @ 1W/1m 83.8 dB ±1.01
Rated Noise Power (IEC 268-5 18.1) 30 W
Test Spectrum Bandwidth 60Hz-5KHz 12 dB/Oct
Effective Piston Area 50.3 cm2
Moving Mass 6.9 g
Motor Force Factor 5.58 T•m
Voice Coil Inner Diameter 25.73 mm
Gap Height 6 mm
Maximum Linear Excursion 3 mm
Ferrofluid Type
Minimum Impedance 6.43 Ω ±7.5%
Voice Coil Inductance 0.24 mH
Mechanical Q Factor 4.66
Electrical Q Factor 0.49
Total Q Factor 0.44
Ratio 143.78 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 923 μm/N
Effective Cone Diameter 8 cm
Motor Efficiency Factor 5.6 (T•m2)/Ω
Voice Coil Former Material GSV
Driver Mass 0.74 Kg
Equivalent Volume 3.28 L



Platform: Peerless
Driver Type: Woofer
Size: 4 in
Motor: Ferrite
Frame: Steel Basket
Impedance: 8 Ω
Diaphragm: CP (Coated Paper)