DRIVE UNITS BY MANUFACTURER:
C173-6-096

The Accuton C173-6-096 Bass / Midrange is an esoteric 7 inch unit primarily intended for high end 3 way designs.
This state of the art driver features a ceramic cone with soft rubber surround and an impressive motor system comprising a large Neodymium magnet and 55mm titanium voice coil former. Sensitivity is high at 94 dB broadening the scope of application.
The spider, pole and voice coil former are fully ventilated for minimal compression. This 6 ohm unit has a power rating of 120 watts .
Full datasheets can be downloaded from the bottom of this page.
Vented:
Vb: 8L, Fres: 25Hz with passive radiator, -18dB @ 25Hz, Q: 0.38 (optimal A/V alignment)
Vb: 4.1L, Port diameter: 50mm, Length: 170mm, Fres: 82Hz, F-3dB: 85Hz, Q: 0.50 (typical A/V alignment)
Vb: 11L, Port diameter: 50mm, Length: 150mm, Fres: 53Hz, F-3dB: 55Hz, Q: 0.34 (extended bass)
Infinite baffle:
Vb: 4.1L, -18dB @ 40Hz, F-3dB: 175Hz, Q: 0.50 (clean transient response)
Vb: 11L, -15dB @ 40Hz, F-3dB: 170Hz, Q: 0.38 (extended bass for active systems)
A matching passive radiator is available : Accuton P173
| Resonant frequency (fs) | 39Hz | DC resistance (Re) | 6.6Ω |
| Mechanical Q factor (Qms) | 3.9 | Power handling | 120W |
| Electrical Q factor (Qes) | 0.18 | Sensitivity (2.83V/1m) | 94dB |
| Total Q factor (Qts) | 0.17 | Chassis diameter | 173mm |
| Equivalent volume (Vas) | 28L | Cutout diameter | 146mm |
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I came across some info that after many years these old B&W P4's tweeters degrade. As I grew older, (with reduced hearing of course), I never noticed this gradually deterioration over the years. So I bought the replacement tweeters from Willy's which was picked up just a few days later in Norway. They were mounted in 30 minutes,.. and what a change! My HiFi sounds as a new set. Thanks!
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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!
