All systems go !
All systems go !
DRIVE UNITS BY MANUFACTURER:
C90-6-724

The C90-6-724 is a 5 inch chassis (124mm) Midrange / Bass drive unit with an ultra hard ceramic (Sapphire) diaphragm in the form of a large inverted dome.
The voice coil former is the same diameter as the dome and is bonded to its outer periphery - the entire rear radiating surface is completely unobstructed and free from the effects of reflection or unwanted stored energy.
This unit features a low loss rubber surround and a strong but delicate fabric spider giving an impressive maximum linear excursion of 8mm.
A very discrete and secure clamping technique provides easy mounting and adaptation to individual baffles.
We recommend an application from 60 Hz – 6000 Hz.
Full datasheets can be downloaded from below.
| Resonant frequency (fs) | 65Hz | DC resistance (Re) | 5.9Ω | 
| Mechanical Q factor (Qms) | 0.9 | Power handling | 100W | 
| Electrical Q factor (Qes) | 5.47 | Sensitivity (2.83V/1m) | 89dB | 
| Total Q factor (Qts) | 0.52 | Chassis diameter/square | 124mm | 
| Equivalent volume (Vas) | 5.1L | Cutout diameter/square | 124.5mm | 
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Built to order - contact us for a lead time.
Friendly technical support
40+ years in the trade
UK family run business
Excellent customer service
Quick dispatch
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 😆
thx you so much for helping me geting the twiters for my speakers i hope all good for your bisnis in the futur and that it will never close i recemed you to the norwigen hifikluben its a store in norway for parts and hifi so you brobely will get order from ther now thx agine for the parts btw you need to put a bit of fome on the back side of the speakers for it to mount in the b&w cmd1 se to make them fit i will leave som pictur of the istalsjon
