DRIVE UNITS BY MANUFACTURER:
SPH-170
Categories: 6-8 inch Bass / Midrange Speakers Monacor Drive Units
The Monacor SPH-170 is a 7.25 inch (185mm) midwoofer featuring a carbon damped polypropylene cone, an inverse soft butyl rubber surround, a powerful 100mm ferrite magnet system and a rigid diecast aluminium basket.
Drive units that feature a smaller diameter voice coil, a plastic cone & an inverse surround (such as the original Spendor BC1 bass unit) often offer a linear bandwidth with a very sweet midrange performance and that is indeed the case with the SPH-170. A good choice for BBC inspired 2 way stand mount designs.
Resonant frequency (fs) | 38 Hz | Nominal impedance (Zn) | 8 Ω |
Mechanical Q factor (Qms) | 2.38 |
DC resistance (Re) | 6.3 Ω |
Electrical Q factor (Qes) | 0.55 | Max power handling | 80W |
Total Q factor (Qts) | 0.44 | Sensitivity (2.83V/1m) | 90 dB |
Equivalent volume (Vas) | 37L | Chassis diameter |
185 mm |
SPH170
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)!