SHIPPING TO USA TEMPORARILY SUSPENDED
SHIPPING TO USA TEMPORARILY SUSPENDED
DRIVE UNITS BY MANUFACTURER:
SB12PACR25-4-COAX
NEW PRODUCT - UK STOCK ITEM
The SB Acoustics SB12PACR-4-COAX is a 2 way coaxial loudspeaker drive unit featuring a 4" anodised aluminium cone with a 1" centre mounted soft dome tweeter. Extended frequency response, highly dynamic sound.
Crossover designs can be found within the SB Acoustics Technical Notes webpage.
The tweeter is available as a spare part: SB14ST-C000-4 , it can be adapted to repair various other coaxial speakers that feature a 1" pole piece.
Resonant frequency (fs) | 55 Hz | Nominal impedance (Zn) | 4 Ω |
Mechanical Q factor (Qms) | 4.84 | DC resistance (Re) | 3.1 Ω |
Electrical Q factor (Qes) | 0.38 |
Max power handling | 30 W |
Total Q factor (Qts) | 0.35 |
Sensitivity (2.83V/1m) |
87.5dB |
Equivalent volume (Vas) | 4.3L | Chassis diameter |
122mm |
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)!