DRIVE UNITS BY MANUFACTURER:
SPH-135/AD
DISCONTINUED BY MANUFACTURER - SOLD OUT.
This 135mm / 5¼" unit is used in the Sterling Broadcast LS3/5a.
Featuring a mineral loaded (carbonised) polypropylene cone with a high internal damping factor, this unit offers a flat extended response with non of the large midrange peaks that plagued the majority of bextrene coned B110s.
A great replacement for a huge range speakers including various models from Mission, Castle, JPW, Rogers and others.
| Resonant frequency (fs) | 39 Hz | Nominal impedance (Zn) | 8 Ω |
| Mechanical Q factor (Qms) | 3.40 | DC resistance (Re) | 6 Ω |
| Electrical Q factor (Qes) | 0.42 | Max power handling | 60W |
| Total Q factor (Qts) | 0.37 | Sensitivity (2.83V/1m) | 89 dB |
| Equivalent volume (Vas) | 26L | Chassis diameter (pincushion profile) | 135 mm |
SPH135AD, SPH 135AD
Used in a DIY LS3/5a project, with Morel CAT 298 tweeters and custom crossovers using ClarityCap CSAs. Super pleased with these woofers! I think they synergize well with the “live” thin-wall LS3/5a cabinets. The sound is neither bloated, nor thin, just revealing, spacious, and with very lifelike tone. I’m so happy with the results of this project and had a great buying experience with Willy’s. Thank you!!
Thanks for the review - that's a great looking project !
Will & Caroline
Friendly technical support
40+ years in the trade
UK family run business
Excellent customer service
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I tried this uprated capacitor through sheer curiosity and am pleasantly surprised with the results. So far, and not too many hours in, it’s giving a slightly smoother edge to the top end and has solved an issue I had regarding some hardness to the sound. I’m impressed enough that I’ll look to replace the mid range caps in the future.
I came across some info that after many years these old B&W P4's tweeters degrade. As I grew older, (with reduced hearing of course), I never noticed this gradually deterioration over the years. So I bought the replacement tweeters from Willy's which was picked up just a few days later in Norway. They were mounted in 30 minutes,.. and what a change! My HiFi sounds as a new set. Thanks!
New Foam covers supplies by WHF have completely changed the appearance- they look brand new! Great quality foam, very reasonably priced and quick delivery. Delighted with they now look and sound - will hang on to them forever now.
Excellent upgrade, works perfectly with the speakers it's just soldier and play, they takeaway the over intensity of the original tweeters.
I've had my Mission 734s for about 30 years and for the last five or so the bass units have been falling to pieces. I was about to take the speakers to the tip, but didn't have the heart knowing how capable these used to be. I did a little internet research and these Monacor replacements appeared to do the job. Next day delivery from Willys was impressive, as was the killer sound once the replacements were fitted (which was a simple job). I'd forgotten how these speakers make the windows rattle. Very happy customer!
