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DRIVE UNITS BY MANUFACTURER:
S220-6-221
Categories: 8-10 inch Bass Speakers Accuton Drive Units - All

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.
Vented:
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)
| 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 |
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Delivery usually 7-10 working days if not in stock.
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I tried this uprated capacitor through sheer curiosity and am pleasantly surprised with the results. So far, and not too many hours in, it’s giving a slightly smoother edge to the top end and has solved an issue I had regarding some hardness to the sound. I’m impressed enough that I’ll look to replace the mid range caps in the future.
New Foam covers supplies by WHF have completely changed the appearance- they look brand new! Great quality foam, very reasonably priced and quick delivery. Delighted with they now look and sound - will hang on to them forever now.
Excellent upgrade, works perfectly with the speakers it's just soldier and play, they takeaway the over intensity of the original tweeters.
I've had my Mission 734s for about 30 years and for the last five or so the bass units have been falling to pieces. I was about to take the speakers to the tip, but didn't have the heart knowing how capable these used to be. I did a little internet research and these Monacor replacements appeared to do the job. Next day delivery from Willys was impressive, as was the killer sound once the replacements were fitted (which was a simple job). I'd forgotten how these speakers make the windows rattle. Very happy customer!
Excellent service from Willys-Hifi. Caroline was very helpful and patient when answering my queries. Please be aware that some soldering is required when connecting the tweeters. Something I haven't done since I was at school over 40 years ago! They do sound good though, listening to Smoke on the Water as I write , wow 😆
