All systems go ! Peerless NE25VTS-04 Tweeter back in stock click HERE for details.

All systems go ! Peerless NE25VTS-04 Tweeter back in stock click HERE for details.


Willys-Hifi Loudspeaker Spares News

Connecting OWI and OWII tweeters.

Hiquphon logo


Hiquphon tweeters feature a unique connection method which gives the most reliable and perfectly complete termination without the danger of introducing any form of audible footprint (such as buzzing or ringing) that can easily happen with tags. The solder bucket connections are easy to deal with; all that is required is a steady hand, some multicore solder, a modestly powered soldering iron and cable cutters / strippers.

Please do not remove the protective sticker from the dome aperture until connections are completed.

Solder buckets:

On the rear of the tweeter you will find generously sized solder buckets which are designed to accommodate cables upto 2.5mm. For temporary connection or testing you can use 2.5mm banana plugs; please bear in mind that banana plugs cannot be used as a viable long term connection method:

Hiquphon solder buckets

Cable preparation:

Strip back approximately 10-12mm of the cable insulation, then twist and tin the wires with the soldering iron:

Hiquphon cable prep

Solder connections:

Place the tweeter on a stable but soft surface to protect the faceplate - wobbly mid air connections are very risky and best avoided.

Insert the prepared wires fully into the solder buckets then carefully heat the joint with the soldering iron until solder flows and fills the bucket entirely. The soldering iron used in the pictures is rated at 25 watts with a 3mm chisel tip. As with all soldered connections, cleanliness is key.

Soldering tweeter


The end result:

With a little care and attention you should end up with something like this:


Soldered joints

A perfectly terminated connection !

If the soldering iron accidently slips and melts the tweeter body near the solder buckets don't worry too much, the integrity of the tweeter will not be affected.

There is one optional further step:

Though not strictly necessary, you can fill the solder bucket tapered recesses with hot melt adhesive - this does of course add a slight complication if you ever want to remove the tweeters.


To remove the tweeters simply reheat the buckets until the solder melts then pull out the wires - the connections are rugged and can be unsoldered easily without damage.

Take appropriate care to avoid any burns when soldering !

We hope you found this little photo guide helpful; if you need any further advice please contact us.

Hiquphon Logo © Oskar Wrønding

Text & images  © Willys-Hifi Ltd, official UK distributor for Hiquphon.

  • 2 min read

Dome tweeter repair kits.

Morel logo

We stock 3 genuine Morel repair kits - these are all easy to fit and cover the majority of popular models, both new and old. Ideal for repairing tweeters with damaged / pushed in domes or open circuit voice coils:

Morel R29 suits models MDT-29and  CAT 298.

Morel R30 suits models MDT-30Sand  CAT 308.

Morel R33 suits models MDT-32, MDT-33, CAT 328ET 338, ST 1048, ST 1108, ST 1308.

These dome / voice coil kits represent a very cost effective way of bringing defective tweeters back to specification without having the extra expense of replacing the complete drive unit.

We also stock ferrofluid here:  Ferrofluid repair kit


Morel R33 repair kit

  • 1 min read

Morel Tweeter Replacement Guide.

Morel logo

Here is a table showing the old classic Morel tweeter models and their modern suggested replacements:

MDT-29 CAT 298
MDT-30 CAT 308
MDT-32S CAT 328-104 / CAT 328-110
MDT-33S  ET 338-104 / ET 338-110
MDT-37    CAT 378
MDT-39 CAT 408
MDT-44 ET 448

The MDT-32S and MDT-33S have 2 possible replacements - the only difference is the faceplate diameter of its modern equivalent, either 104 or 110mm.

Further info on Morel proprietary drive unit technologies can be found here:  Morel Technology

All Morel drive units are covered by our price match promise, for details click herePrice match

Phone helpline: 01702 523999 or contact us

Free shipping to the UK mainland - all prices include VAT.

  • 1 min read

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 Subwoofertechnology 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

  • 2 min read

We now stock a range of spare parts for popular Scanspeak tweeters.

Scanspeak logo

Easy to replace dome / voice coil assemblies that avoid the cost of replacing the complete drive unit.

Click the links below for more details:

Replacement dome assembly D2905/930000

Replacement dome assembly D2905/950000

Replacement dome assembly D2905/970000

Replacement dome assembly D2905/990000

Dome assembly backDome assembly front


  • 1 min read

Monacor logo

Our stocked selection of Monacor drivers cover a wide range of replacement applications, here are a few suggestions:

KEF B110 & variants : SPH-135AD

Linn Isobarik midrange upgrade : SPH-135KEP

TDL Studio 0.5 : SPH-5M

Meridian M33 : SPH-135C

The SPH-8M can replace a huge number of 8" bass units

SPH-205 has an 8 inch 'pincushion' chassis (similar to KEF B200, Dalesford D50/200)

More details can be found on the individual listings.

Looking for other Monacor products ?  contact us

  • 1 min read

Naim used the non - ferrofluid Scanspeak D2010/851100 in high end models SL2, DBL and NBL - we now hold this tweeter in stock for immediate dispatch.


Also available:

Scanspeak D2010/851300

(ferrofluid cooled version) as used in ProAc Studio 150, Response 2 & 2.5, S1C; Spendor S100, SP2/3.


Replacement foam font for D2010

For restoring factory finish.

D2010 foam

  • 1 min read

Excellent new high end in-car drive units.

Scanspeak logo

Scanspeak have released an exciting range of high-end automotive component drive units called the 'Silver Series'. Using technology mainly from the renowned Revelator and Illuminator ranges, these new speakers are tailored specifically for the unique requirements of the in-car environment and provide audiophile quality sound.

                                   Click logo or images for full details:

                                           Automotive logo

 Scanspeak 10M/4614G06Scanspeak D3004/602006Scanspeak R3004/602006

Scanspeak 16W/4531G06Scanspeak 26W/4558T06Scanspeak 30W/4558T06


Phone helpline: 01702 523999 or contact us

Willys-Hifi Ltd - the specialist UK loudspeaker parts company

  • 1 min read

Two excellent new products from Scanspeak:

The H2606/9200.00 is a high performance horn loaded dome tweeter offering an excellent high efficiency of 95.2dB ~ ideal for class A and other low output amplifiers. This tweeter is superb value at under £30.


The 18M/4631T00Midrange driver is a welcome addition to the revered high end Revelator series; with a sliced / damped 18cm cone and ultra low loss suspension it offers a high sensitivity of 92 dB with a wide, controlled frequency range extending to almost 10 khz. A worthy contender for top end DIY designs.



  • 1 min read