DRIVE UNITS BY MANUFACTURER:
12MU/4731T00
The Scanspeak 12MU/4731T00 Illuminator series.
Features include a cutting edge open chassis with airflow optimisation and an underhung Neodymium magnet system that is outrigged from the chassis - the combination of these advancements define new standards in terms of minimal compression & reflection.
With a text book response curve and extraordinary bandwidth of 100Hz-10KHz, this audiophile drive unit is an ultimate choice for high end 3 way systems and represents the very pinnacle of transparency and sound quality.
This is the 4 Ohm version - 8 Ohm version here: 12MU/8731T00
Resonant frequency (fs) | 64 Hz | Nominal impedance (Zn) | 4 Ω |
Mechanical Q factor (Qms) | 3.64 | DC resistance (Re) | 3.1 Ω |
Electrical Q factor (Qes) | 0.26 | RMS power handling | 80 W |
Total Q factor (Qts) | 0.24 | Sensitivity (2.83V/1m) | 90 dB |
Equivalent volume (Vas) | 5.4L | Chassis diameter | 120 mm |
Friendly technical support
40+ years in the trade
UK family run business
Excellent customer service
Quick dispatch
Been looking for a supplier of replacement drivers for some years.
Willy's HiFi had just the parts at a good price and they arrived in a couple of days.
Excellent service. Even a personal thank you hand written on the invoice.
A quick delivery and the tweeters are perfect on my mission 753 freedom speakers. Easy to fit . Highly recommend.
I’m no expert when it comes to speakers, but after some research (and a strong recommendation from ChatGPT), I went with the SB Acoustics SB65WBAC25-4 as a reference full-range speaker in this size range.
Having now tested them, I can confidently say they’re probably the best speakers I’ve ever owned. The clarity is outstanding—every detail comes through with incredible precision. The bass is surprisingly full and punchy for a speaker this size, and they handle power impressively well. For anyone looking for a high-performance compact full-range driver, these are hard to beat.
Item as described and arrived quickly - and did the job. However, I suggested that anyone replacing speaker foam makes sure they have a very large pair of sharp dressmaking scissors as it was not easy cutting to size without producing a ragged edge (which I managed to hide short of a close inspection)!