Accuton S220-6-221 Sandwich Bass

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The  S220-6-221  is an 8 inch bass driver with ultra stiff ceramic - sandwich dome. A  FEA optimized  overhung motor design with 38 mm titanium voice coil former guarantees very low energy storage and good heat transfer. The low loss rubber surround and a  thin fabric spider  center the moving parts with high linearity. As a typical home stereo bass driver, we recommend our S220-6-221 for an application from 31 Hz - 1000 Hz.

  • 8.5 inch sandwich cone bass with high efficiency for 2 or 3-way designs
  • large sized voice coil with 55mm titanium voice coil former
  • big, underhung 120mm Neodymium magnet system for very low distortion

Vented box design parameters:
  • Vb: 30L, Fres: 23Hz with passive radiator, -12dB @ 25Hz, Q: 0.47 (optimal A/V alignment)
  • Vb: 25L, Port diameter: 70mm, Length: 230mm, Fres: 40Hz, F-3dB: 43Hz, Q: 0.50
  • Vb: 40L, Port diameter: 70mm, Length: 155mm, Fres: 37Hz, F-3dB: 37Hz, Q: 0.43 (extended bass)

Closed Box design parameters:
  • Vb: 12L, -11dB @ 40Hz, F-3dB: 69Hz, Q: 0.71 (typical)
  • Vb: 25L, -8dB @ 40Hz, F-3dB: 70Hz, Q: 0.50 (extended bass)

Short data

Usage as Woofer
Power Handling 150 Watt
Impedance 6 Ohm
Frequency from 31 Hz
Max. Frequency 1 kHz
Sound pressure 89 dB


Overall dimensions 220 mm
Baffle cutout 190.5 mm
Depth (Total) 105 mm
Frame Material Aluminium diecast
Membrane Type Cone
Membrane Surround Rubber
Membrane Material Ceramic sandwich
Voice coil Ø 38 mm
Voice coil material Titanium


Resonance fs fs: 21 Hz
Mechanical Q Qms: 6.6
Electrical Q Qes: 0.38
Total Q Qts: 0.36
Equivalent Air-Volumen Vas: 116 Liter
DC-Resistance Re: 5.8 Ohm
Coil Inductance Le: 0.8 mH
Mech. Compliance Cms: 1.63 mm/N
Moving Mass Mms: 33.6 g
mech. Resistance Rms: 0.69 kg/s-¹
Max. Excursion +/- Xmax: 5 mm
BL Product Bl: 8.9 N/A
Membrane Area Sd: 227 cm²
Sound pressure dB: 89 SPL


Harmonic Distortion


Technical Dimensions

PDF-Product information

You receive a 2 year warranty from the date of purchase for all of our high quality hifi-products.

If you observe any problem while using the product, you have the possibility to contact our friendly service team.

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Warranty extention on Accuton products

You have the possibility to extend the warranty on Tannoy ceramic and diamond speakers for free amounting to 3 years from the purchase date.

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