DRIVE UNITS BY MANUFACTURER:
MSH-115
Monacor MSH-115, 4" hifi midrange drive unit.
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Good replacement for ELAC IMF 4/200 found in various IMF models such as TLS50, IMF Compact, Super-Compact & others.
Critically damped pulp cone gives a wide usable bandwidth with a text book response between 400-5000 Hz - excellent linearity, no significant peaks in the response.
The flat profile front chassis allows hassle free flush mounting - no need for a rebate or router.
This versatile driver can replace and upgrade a huge number of midrange units and offers a level of performance that is exceptional at this price.
A full datasheet can be downloaded from this page.
Basic parameters:
Resonant frequency (fs) | 85 Hz | Nominal impedance (Zn) | 8 Ω |
Mechanical Q factor (Qms) | 1.98 | DC resistance (Re) | 6.3 Ω |
Electrical Q factor (Qes) | 0.55 | Max power handling | 120W |
Total Q factor (Qts) | 0.43 | Sensitivity (2.83V/1m) | 89 dB |
Equivalent volume (Vas) | 4 L | Chassis (across flats) | 115 mm |
Here's the full datasheet:
MSH115
These drivers have a smooth, natural sound with good resolution & dynamics for the price. Their level frequency response makes them easy to integrate with other drive units, and the low profile compact steel chassis allows them to fit into tight spaces. A great little replacement midrange driver, if the dimensions meet your requirements.
Thanks for the review Simon !
Will & Caroline
I bought a pair to replace aged mids in my IMF Studio Monitors...definitely an upgrade!
Thanks for the review Ross !
Will & Caroline
I replaced my midrange drivers in my IMF Studio TLS 50 Mk1 speakers that are 50 years old at present with these drivers. I am the original owner of these and I have to say after installing these drivers in both of the speakers I just love the results. I couldn’t be happier. They have brought my speakers back to life!
Thanks for the review Frank !
Will & Caroline
Excellent service , product and price A++
Thanks for the review Christiaan !
Will & Caroline
A while ago I revamped a pair of IMF Super Compact 2. The surrounds of the original ELAC mids were cracked and hardened (due to aging of the foam) which is typical for these old mids. I decided to look for a replacement and bought two of these Monacors. In my opinion the Monacor has a more detailled sound but its sensitivity is higher and you here it when it's not compensated for. Simply said; 'the mids are to loud'. It's specified at 89 dB/1W/1m and the average sensitivity of the old ELAC must be about 86 dB/1W/1m. So this issue had to be adressed. Measuring a speaker with the ELAC replaced by the Monacor using a standardized set-up (sw and pro measurement microphone) showed a higher average sensitivity of about 3,5 dB compared to the bass and high frequencies. So an L-pad has been used to attenuate the mids 'loudness'. Now this has been done, the result is great.
Kind regards,
Martin
Thankyou for your review !
Will & Caroline
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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)!