DRIVE UNITS BY MANUFACTURER:
C158-8-085
The Accuton C158-8-085 Bass / Midrange driver is a development of the C158-6-851 with a slightly different design criteria : a revised motor system comprising of a light weight 25mm voice coil and titanium former assembly give improvements to both midrange resolution and extension plus a mild increase in sensitivity.
Designed specifically for small monitors and slim floor standing designs, this esoteric unit has a soft rubber suspension, an ultra hard 120mm ceramic (Sapphire) cone and a large 10mm maximum excursion allowing it to produce impressive volume levels from small footprint enclosures.
The spider, pole and voice coil former are fully ventilated for minimal compression. This 8 ohm unit has a power rating of 100 watts - very respectable for a domestic driver of this size.
Full datasheets can be downloaded from the bottom of this page.
Vented:
Vb: 15L, Port diameter: 50mm, Length: 190mm, Fres: 41Hz, F-3dB: 45Hz, Q: 0.58
Vb: 22L, Port diameter: 50mm, Length: 130mm, Fres: 40Hz, F-3dB: 40Hz, Q: 0.50
Vb: 12L, Port diameter: 50mm, Length: 200mm, Fres: 45Hz, F-3dB: 49Hz, Q: 0.61
Infinite baffle:
Vb: 8.5L, -11dB @ 40Hz, F-3dB: 70Hz, Q: 0.71
Vb: 22L, -8.5dB @ 40Hz, F-3dB: 70Hz, Q: 0.50
Resonant frequency (fs) | 33Hz | DC resistance (Re) | 7.8Ω |
Mechanical Q factor (Qms) | 4.12 | Power handling | 100W |
Electrical Q factor (Qes) | 0.34 | Sensitivity (2.83V/1m) | 89dB |
Total Q factor (Qts) | 0.31 | Chassis diameter | 158mm |
Equivalent volume (Vas) | 35L | Cutout diameter | 137mm |
Click icons to download :
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
I always knew that Linn should never have stopped using Hiquphon tweeters. What I don't know is why it's taken me thirty years to fit a pair in my old Kabers. It's often hard to describe sonic character ....but to pinch Linn's old line from back in the day ...they're Simply Better.(even straight out the box with soldering iron still warm)
As my Kabers are passive,I had been a little concerned that the the 8 ohm nominal impedence of the OW1 would mess with the crossover slope. I needn't have worried....if its shifted the crossover point its much for the better.
Warm thanks also to Will and Caroline for a service in keeping with the outstanding quality of the Hiquphon product.
Alan
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.