SHIPPING TO USA TEMPORARILY SUSPENDED
SHIPPING TO USA TEMPORARILY SUSPENDED
DRIVE UNITS BY MANUFACTURER:
18W/8542-00
DISCONTINUED - NO LONGER AVAILABLE.
REPLACED BY: 18W/8542-10
This popular 6.5" bass / midrange speaker has been used in various mainstream designs ~ a long term favourite with the DIY speaker building community and widely regarded as one of the finest pulp based drive units ever produced.
Features include an air dried composite fibre cone, symmetric drive and an alloy chassis.
A full datasheet can be downloaded from the bottom of this page.
Resonant frequency (fs) | 30 Hz | Nominal impedance (Zn) | 8 Ω |
Mechanical Q factor (Qms) | 1.70 | DC resistance (Re) | 5.5 Ω |
Electrical Q factor (Qes) | 0.26 | RMS power handling | 70 W |
Total Q factor (Qts) | 0.23 | Sensitivity (2.83V/1m) | 89 dB |
Equivalent volume (Vas) | 47.9L | Chassis diameter | 177 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)!