All systems go ! Fountek NeoPro5i and NeoPro10i ribbon tweeters in UK stock.

All systems go ! Fountek NeoPro5i and NeoPro10i ribbon tweeters in UK stock.



Accuton C158-8-085 Ceramic Bass / Midrange

6.25 inch / 158mm Ceramic Bass - Midrange. High midrange resolution design.

Accuton logo

The Accuton C158-8-085 Bass / Midrange driver is a development of the  C158-6-851 with a slightly different design criteria : a revised motor system comprising of a light weight 25mm voice coil and titanium former assembly give improvements to both midrange resolution and extension plus a mild increase in sensitivity.

Designed specifically for small monitors and slim floor standing designs, this esoteric unit has a soft rubber suspension, an ultra hard 120mm ceramic (Sapphire) cone and a large 10mm maximum excursion allowing it to produce impressive volume levels from small footprint enclosures.

The spider, pole and voice coil former are fully ventilated for minimal compression. This 8 ohm unit has a power rating of 100 watts - very respectable for a domestic driver of this size.

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

Here are some box alignment examples:


Vb: 15L, Port diameter: 50mm, Length: 190mm, Fres: 41Hz, F-3dB: 45Hz, Q: 0.58

Vb: 22L, Port diameter: 50mm, Length: 130mm, Fres: 40Hz, F-3dB: 40Hz, Q: 0.50

Vb: 12L, Port diameter: 50mm, Length: 200mm, Fres: 45Hz, F-3dB: 49Hz, Q: 0.61

Infinite baffle:

Vb: 8.5L, -11dB @ 40Hz, F-3dB: 70Hz, Q: 0.71

Vb: 22L, -8.5dB @ 40Hz, F-3dB: 70Hz, Q: 0.50

Key Features:

  • Ultra hard 120mm ceramic cone (Corundum / Sapphire)
  • 158mm diameter chassis with protective grille
  • 25mm voice coil assembly for midrange clarity
  • 35 Hz - 3kHz response possible in vented box
  • Underhung motor, titanium VC former
  • Ferrite magnet system
  • Long throw max. 10mm

Basic Parameters:

    Resonant frequency (fs) 33Hz DC resistance (Re) 7.8Ω
    Mechanical  Q factor (Qms) 4.12 Power handling 100W
    Electrical Q factor (Qes) 0.34 Sensitivity (2.83V/1m) 89dB
    Total Q factor (Qts) 0.31 Chassis diameter 158mm
    Equivalent volume (Vas) 35L Cutout diameter 137mm

    Click icons to download :

    .pdf iconData              .pdf icon3D View (large file)                                                                          

    .pdf iconDimensions

    Built to order - contact us for a lead time.

    Customer Reviews

    Based on 1 review
    Kevin Buss
    Replacement driver following a heavy foot on the gas pedal

    Exact replacement. I'm good to go again. And have a spare now, just in case, knowing how fragile the drivers are.

    Thanks for the review Kevin !

    Will & Caroline