DRIVE UNITS BY MANUFACTURER:
C158-6-851
UK STOCK ITEM !
The Accuton C158-6-851 Bass / Midrange drive unit features an ultra hard ceramic (Sapphire) 120mm cone inside a 158mm diameter chassis.
Designed specifically for small monitors and slim floor standing designs, this esoteric unit has a soft rubber suspension and a large 10mm max. excursion allowing it to produce very good volume levels from small footprint enclosures.
A high power pure copper voice coil and ventilated titanium voice coil former yield a substantial power rating of 120 watts - quite high for a domestic driver of these dimensions.
Full datasheets can be downloaded from the bottom of this page.
Vented:
Vb: 10L, Port diameter: 40mm, Length: 145mm, Fres: 46Hz, F-3dB: 47Hz, Q: 0.58
Vb: 15L, Port diameter: 40mm, Length: 100mm, Fres: 43Hz, F-3dB: 41Hz, Q: 0.50
Vb: 6.5L, Port diameter: 40mm, Length: 220mm, Fres: 48Hz, F-3dB: 54Hz, Q: 0.61
Infinite baffle:
Vb: 2.3L, -16dB @ 40Hz, F-3dB: 98Hz, Q: 0.71
Vb: 7L, -14dB @ 40Hz, F-3dB: 96Hz, Q: 0.50
Resonant frequency (fs) | 30Hz | DC resistance (Re) | 6.3Ω |
Mechanical Q factor (Qms) | 5.1 | Power handling | 120W |
Electrical Q factor (Qes) | 0.30 | Sensitivity (2.83V/1m) | 88dB |
Total Q factor (Qts) | 0.27 | Chassis diameter | 158mm |
Equivalent volume (Vas) | 26.4L | Cutout diameter | 137mm |
Click icons to download :
Made 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)!