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Accuton S220-6-222 Sandwich Bass Unit

8.5 inch 6 ohm Ceramic Sandwich Bass Unit. Neodymium magnet.

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The Accuton  S220-6-222  is an esoteric 8.5 inch (220mm) bass drive unit primarily intended for medium size 3 way floor standing speakers and studio monitors of the highest quality.

This high end driver features an ultra stiff ceramic sandwich cone with a soft rubber long throw surround. The large Neodymium magnet and 55mm titanium former yield very low distortion levels whilst maintaining a high sensitivity of 92.5 dB.

The spider, pole and voice coil former are fully ventilated for minimal compression. This driver has a substantial power rating of 150 watts and offers pure, accurate transients with good weight and control.

Full datasheets can be downloaded from the bottom of this page.

Here are some box alignment examples:


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)

Infinite baffle:

Vb: 12L, -11dB @ 40Hz, F-3dB: 69Hz, Q: 0.71 (typical)

Vb: 25L, -8dB @ 40Hz, F-3dB: 70Hz, Q: 0.50 (extended bass)

Key Features:

  • Ultra rigid ceramic sandwich cone (Corundum / Sapphire)
  • 220mm diameter chassis with protective grille
  • High power 55mm voice coil assembly
  • Underhung motor, titanium VC former
  • 31 Hz - 1 KHz in vented box
  • Large Neodymium magnet
  • Long throw max. 12mm

Basic Parameters:

    Resonant frequency (fs) 21Hz DC resistance (Re) 6.7Ω
    Mechanical  Q factor (Qms) 4.4 Power handling 150W
    Electrical Q factor (Qes) 0.21 Sensitivity (2.83V/1m) 92.5dB
    Total Q factor (Qts) 0.20 Chassis diameter 220mm
    Equivalent volume (Vas) 139L Cutout diameter 191mm

    Click icons to download :

    .pdf iconData              .pdf icon3D View (large file)                                                                          

    .pdf iconDimensions

    Built to order - contact us for a lead time.

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