Morel Drive Units - all models available

June 17, 2016

Morel Drive Units - all models available

Morel proprietary technologies.

Click the Morel logo to access the complete range of drive units.

Morel from Willys-Hifi Ltd

Morel has been at the forefront of drive unit development for more than three decades. This page is a descriptive list of the various technologies and their application as found across the Morel range of loudspeaker drive units.

Hexatech™ Aluminium Voice Coil:

This technology made it's debut in the 1980s are was put to excellent use in the legendary MDT33 tweeter - the modern updated version is the ET 338 .

Made from 100% aluminium wire shaped like a honeycomb, the Hexatech™ voice coil reduces air gaps in the coil windings, thereby increasing efficiency by up to 20%. Being lightweight, Hexatech™ voice coils are largely responsible for the extraordinary, fast-transient response Morel drive units are known for. The majority of Morel drive units feature Hexatech wire. A notable exception is the excellent entry level  CAT 298 tweeter.

Uniflow™ Chassis:

The Uniflow™ chassis is featured on many Morel Bass / Midrange drive units such EW 536 Woofer and the SCM 634 Midrange;  it is a maximally open design that is aerodynamically efficient, allowing air and sound waves to flow uniformly and smoothly. Its geometric shape also eliminates interference with the woofer’s moving components, enabling the use of a low-profile spider for greater support and stability - this alloy chassis is found in the majority of woofers / midranges with a couple of exceptions that use a steel uniflow chassis (the smaller CAW 428 Woofer and EM 428 Midrange).

PFS™ – (Progressive Field Symmetry) engineering:

A Morel Ultimate Subwoofer technology that produces longer linear excursion and optimized performance at high power output, enabling the spider and surround to reach optimal performance especially at high output levels. When powerful subwoofers such as the UW 1258 are driven under extreme conditions, the spider and surround progressively act as “shock absorbers” to prevent voice coil displacement and bottoming, and improve voice coil linearity.

IDR (improved Dispersion Recess):

The IDR™ tweeter faceplate is found on many Morel Tweeters such as the ST 1048 and the ET 448; this design enables a wider off-axis dispersion of high frequencies, resulting in an overall smoother performance.

Hybrid Magnet:

The Hybrid motor drive system uses a ferrite magnet together with a very powerful neodymium magnet. Combined they create a compact, lightweight motor system that is up to four times more powerful than conventional designs of the same size. With Hybrid, more amplified power is converted into sonic energy for flawless performance, even in a small driver. Found in various drive units, a couple of noteable examples being the classic MDM 55 Midrange and the cutting edge SCW 636 Woofer.

We hope you found this information helpful.

Will & Caroline






Also in Willys-Hifi Loudspeaker Spares News

Website upgrades for trade and non EU customers

November 30, 2018

Trade customers: EU VIES integration.

Trade customers within the EU can now enter their VAT identification number within our shopping basket or their customer account page for validation by VIES, the process takes a few seconds and if the details entered pass scrutiny, the VAT content will automatically be removed from the total due. You can also save your EU VAT details to your account for future use. This site upgrade gives a far more streamlined checkout process for bona fide EU trade customers.

A picture of the basket input field (highlighted) is shown below:

EU VAT ID demo

 Non EU customers: VAT free sales.

For reference, all of our products now show VAT inclusive / exclusive prices.
Customers outside of the UK/EU territories are exempt from UK VAT - our website will automatically offer you VAT free sales based on your geo location and remove the VAT content accordingly.
If you have any questions or comments please let us know - constructive criticism always welcome :0)


Phone helpline: 01702 523999 or contact us

Willys-Hifi Ltd - the specialist UK loudspeaker parts company

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16 Ohm L-Pad Attenuators

November 23, 2018

16 Ohm L-Pad Attentuators now in stock.

Following many customer requests we now have 50 watt 16 Ohm L-Pad attenuators ready for immediate dispatch from the UK. These elusive spare parts are perfect for restoring vintage loudspeaker models with L-Pads such as the classic AR 4x and many other 15-16 ohm models from the valve era; also suitable for vintage guitar amps featuring EL84 single ended or push - pull output stages with a fixed 16 ohm output tap.

UK / EU Exclusive Product.

Click on the image below for more details:

16 Ohm 50 watt L-Pad attenuator

Phone helpline: 01702 523999 or contact us

Willys-Hifi Ltd - the specialist UK loudspeaker parts company

View full article →

Mission 753 Crossover Rebuilds

July 20, 2018

Mission 753 Crossover Rebuilds.

We now offer a crossover rebuild service for the ever popular Mission 753 floorstanding loudspeaker.

Rather than using specific crossover capacitors, the 753 featured standard aluminium electrolytics wired in series to form non-polarised electrolytics - this far from ideal cost / space saving excercise was part of the price to performance balance, and to be fair worked reasonably well but is now a prime candidate for upgrade. Click on the picture for more details:

Mission 753 crossover

Another potential problem with the 753 is the very high tweeter failure rate and subsequent crossover damage:

Melted inductor

The 753 often turns up on auction sites with dead tweeters - running these speakers with open circuit tweeters for extended periods of time causes the tweeter bypass inductors to heat up and melt; we supply a kit of components to cure this issue:
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Finally, the Mission 753 tweeter is now back in stock:

Mission 753 tweeter

Phone helpline: 01702 523999 or contact us

Willys-Hifi Ltd - the specialist UK loudspeaker parts company

View full article →