DRIVE UNITS BY MANUFACTURER:
C51-6-286
Features include: ultra hard 51mm ceramic dome, 86mm Cell Concept body, discrete clamping system for secure mounting to baffles. The dome breakup mode is above audibility and well damped. A unique FEA optimised underhung motor design with vented titanium voice coil former and double neodymium magnet guarantees low energy storage, excellent heat transfer and high excursion capability for low power compression and ultra low distortion. The new design soft fabric suspension centers the moving parts with improved linearity.
The C51-6-286 is an esoteric, high end midrange drive unit : 800 Hz - 6Khz.
Resonant frequency (fs) | 581 Hz | DC resistance (Re) | 5.6 Ω |
Effective dome diameter | 51mm | Power handling | 120W |
Ferrofluid ? Y/N | No | Faceplate diameter | 86mm |
Recommended crossover | 800Hz< | Overall depth | 87mm |
Sensitivity (2.83V/1m) | 93dB | Cutout diameter | 86mm |
Here's the full datasheet :
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UK family run business
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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)!