DRIVE UNITS BY MANUFACTURER:
SPH-135KEP
DISCONTINUED BY MAKER
The Monacor SPH-135KEP features a woven Kevlar cone and phase correction plug yielding a very wide and smooth usable bandwidth - the output to 7 kHz is remarkably flat. With a maximum linear excursion of 6.5mm this drive unit delivers an open, airy sound and is equally at home as a bass / midrange in small bookshelf designs or as a very fine dedicated midrange unit.
Resonant frequency (fs) | 45 Hz | Nominal impedance (Zn) | 8 Ω |
Mechanical Q factor (Qms) | 5.54 | DC resistance (Re) | 6 Ω |
Electrical Q factor (Qes) | 0.32 | RMS power handling | 50W |
Total Q factor (Qts) | 0.30 | Sensitivity (2.83V/1m) | 89 dB |
Equivalent volume (Vas) | 15.5L | Chassis diameter (pincushion profile) | 133 mm |
SPH135KEP, SPH 135KEP
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)!