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
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)!