All systems go !
All systems go !
DRIVE UNITS BY MANUFACTURER:
18W / 4531G00

The Revelator 18W series of drivers continue the enviable trend set by the smaller 15W range. There's a few different versions - they are all excellent.
This drive unit is available in 4 and 8 Ohm impedance.
Popular among high end & esoteric designers - and with very good reason.
Featuring unique sliced / damped cone technology & huge high efficiency ferrite magnets, these no compromise drive units offer superlative sound quality with outstanding midrange resolution and extension.
This woofer is 4 Ohms ; the 8 Ohm version is here : 18W/8531G00
| Resonant frequency (fs) | 33 Hz | Nominal impedance (Zn) | 4 Ω |
| Mechanical Q factor (Qms) | 5.20 | DC resistance (Re) | 3.4 Ω |
| Electrical Q factor (Qes) | 0.38 | RMS power handling | 70 W |
| Total Q factor (Qts) | 0.35 | Sensitivity (2.83V/1m) | 90 dB |
| Equivalent volume (Vas) | 41.9L | Chassis diameter | 182.2 mm |
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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 😆
