We are extremely busy - enquiries by email only please.
We are extremely busy - enquiries by email only please.
DRIVE UNITS BY MANUFACTURER:
15M/4624G00

This 150mm / 6 inch 4 Ohm midrange unit is constructed from high quality component parts. Features include a coated NRSC fibre glass cone, central phase correction plug, ventilated motor system and a rugged diecast chassis. The output is highly linear and the useable response extends to an impressive 9 kHz.
With a high sensitivity of 92.4dB this 4 ohm driver offers a level of performance and resolution that is unexpected at this price.
Full details and response graph can be found within the downloadable data sheet at the bottom of this page.
| Resonant frequency (fs) | 100 Hz | Nominal impedance (Zn) | 4 Ω |
| Mechanical Q factor (Qms) | 5.62 | DC resistance (Re) | 3.2 Ω |
| Electrical Q factor (Qes) | 0.47 | RMS power handling | 75 W |
| Total Q factor (Qts) | 0.43 | Sensitivity (2.83V/1m) | 92.4 dB |
| Equivalent volume (Vas) | 3.7L | Chassis diameter | 149 mm |
Replaced a midrange unit on my Wharfedale Elysian 4 - great fast service from Willys Hifi - bought a spare just incase
Thanks for the review Mohit !
Will & Caroline
Friendly technical support
40+ years in the trade
UK family run business
Excellent customer service
Quick dispatch
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.
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!
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!
