All systems go! UK Phone helpline number: (+44) 01702 523999

All systems go! UK Phone helpline number: (+44) 01702 523999



Accuton S220-6-221 Sandwich Bass Unit

8.5 inch 6 ohm Ceramic Sandwich Bass Unit.

Accuton logo

The Accuton  S220-6-221  is an esoteric 8.5 inch (220mm) bass drive unit primarily intended for medium to large 3 way floor standing loudspeaker designs and studio monitors.

This high end driver features an ultra stiff ceramic sandwich cone, soft rubber long throw surround, large ferrite magnet and 38mm titanium former.

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 excellent immediacy with powerful, accurate transients.

Also available in 11 ohms impedance (for tube amps or parallel array) - select the impedance you require from the drop down menu.

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

Here are some box alignment examples:


Vb: 66L, Port diameter: 70mm, Length: 300mm, Fres: 22Hz, F-3dB: 27Hz, Q: 0.58 (optimal)

Vb: 101L, Port diameter: 70mm, Length: 150mm, Fres: 23.5Hz, F-3dB: 24Hz, Q: 0.50 (extended bass)

Vb: 56L, Port diameter: 70mm, Length: 300mm, Fres: 24Hz, F-3dB: 29Hz, Q: 0.61 (0.7dB Ripple @ 50Hz)

Infinite baffle:

Vb: 39L, -4dB @ 40Hz, -13dB @ 20Hz, F-3dB: 42Hz, Q: 0.71 (typical)

Vb: 101L, -4dB @ 40Hz, -10dB @ 20Hz, F-3dB: 44Hz, Q: 0.50 (extended bass)

Key Features:

  • Ultra rigid ceramic sandwich cone (Corundum / Sapphire)
  • 220mm diameter chassis with protective grille
  • High power 38mm voice coil assembly
  • Overhung motor, titanium VC former
  • 31 Hz - 1 KHz in vented box
  • Long throw max. 10mm
  • Large ferrite magnet

Basic Parameters:

    Resonant frequency (fs) 21Hz DC resistance (Re) 5.8Ω
    Mechanical  Q factor (Qms) 6.6 Power handling 150W
    Electrical Q factor (Qes) 0.38 Sensitivity (2.83V/1m) 89dB
    Total Q factor (Qts) 0.36 Chassis diameter 220mm
    Equivalent volume (Vas) 116L Cutout diameter 191mm

    Click icons to download :

    .pdf iconData              .pdf icon3D View (large file)                                                                          

    .pdf iconDimensions

    Delivery usually 7-10 working days if not in stock.

    Customer Reviews

    Be the first to write a review