All systems go !

All systems go !



Accuton C220-11-221 Ceramic Bass / Midrange

8.5 inch 11 ohm Ceramic Bass / Midrange driver. For valve amps or parallel array. 

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The Accuton  C220-11-221  Bass / Midrange is an esoteric 8.5 inch drive unit primarily intended for high end 2 and 3 way floor standing designs. The 11 ohm impedance makes this unit ideal for low powered valve amplification or for parallel connection.

This exotic driver features a ceramic (Sapphire) cone, soft rubber surround, large ferrite magnet and 38mm titanium coil former.

The spider, pole and voice coil former are fully ventilated for minimal compression. This unit has a substantial power rating of 150 watts and offers good midrange resolution / extension for a driver of this size.

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

Here are some box alignment examples:


Vb: 70L, Port diameter: 70mm, Length: 255mm, Fres: 23Hz, F-3dB: 30Hz, Q: 0.58 (optimal)

Vb: 116L, Port diameter: 70mm, Length: 100mm, Fres: 25.5Hz, F-3dB: 24Hz, Q: 0.50 (extended bass)

Vb: 58L, Port diameter: 70mm, Length: 235mm, Fres: 26Hz, F-3dB: 31Hz, Q: 0.61 (0.7dB Ripple @ 50Hz)

Infinite baffle:

Vb: 39L, -4dB @ 40Hz, -18dB @ 20Hz, F-3dB: 43Hz, Q: 0.71 (typical)

Vb: 116L, -4dB @ 40Hz, -11dB @ 20Hz, F-3dB: 45Hz, Q: 0.50 (extended bass)

A matching passive radiator is available :  Accuton P220

Key Features:

  • Ultra hard ceramic cone (Corundum / Sapphire)
  • 220mm diameter chassis with protective grille
  • High power 38mm voice coil assembly
  • Overhung motor, titanium VC former
  • 32 Hz - 2 KHz in vented box
  • Long throw max. 10mm
  • Large ferrite magnet

Basic Parameters:

    Resonant frequency (fs) 25.2Hz DC resistance (Re) 10.9Ω
    Mechanical  Q factor (Qms) 6.74 Power handling 150W
    Electrical Q factor (Qes) 0.43 Sensitivity (2.83V/1m) 88dB
    Total Q factor (Qts) 0.40 Chassis diameter 220mm
    Equivalent volume (Vas) 95L 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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