Friday, 15 June 2018

Horns in small detail and how we put them in our speakers.

After being out and about recently in the wide world of audio many conversations were encountered about horns. Since I like horns and to talk about them, certain terms are used which should be conventional. The first of which what kind of horn has what name and how they compare to each other. Here is a well recognised comparison.


A common term which is missing from this chart is the "Spherical" horn profile.
Some say it is the Kugellwellen, others the Tractrix. It is actually closer to the Exponential lying closer to it than the Le Cleac'h. This, I have seen, is commonly misunderstood.

Here is a horn created with JMLC's expansion for a particular driver optimising for its exit angle and frequency range including the coefficient T expansion.

The roll back has been argued by armchair theorists as superfluous since the crossover point is ususally higher than the mouth cut-off frequency however in practice this has not been my experience. The roll back reduces mouth reflection and I believe is in part responsible for it being one of the most natural and best sounding of horns.


Not only that but it looks nice as well.








Some other things we do a little different are rear wave treatments.


Instead of attempting to eliminate rear wave energy with dampening our goal is to distribute it. This means not only diffracting gross reflections into small ones but also using shape to proportion them harmonically.


Pressurised construction allows the structure to be rigid and resonant resistant.


The cabinet is impregnated with resin as well as reinforced.

Front panel preparation.


Final Inspection and bottom plate assembly.



Here is the horn installed complete with its rollback.


Binding posts.


Completed Speakers.



This is the Mojo.
 Model One and Model Three.

We are now taking orders.
Please email for pricing and lead times.

Friday, 1 June 2018

Speaker Design in 3D

Here is a little bit on loudspeaker design using modern tools.

Many will recognise Autocad drawings from the days of old...


It is an excellent tool.


3D however adds another dimension - literally.


It has quickly become a native part of design as it allows visualisation and detail which 2D simply cannot compete with.



Not only can the objects be viewed from all sides but X-Ray views...


and scaled investigations allow an intimate understanding which is as unique... 


as it is powerful.


A new design for instance can be seen from all sides...


and angles not only to examine its expansion...


but also how it will be mounted, its clearances, 


and its overall appearance.


All before the first prototype is built.


This however does not come free. Learning these tools takes time as does the creation of the objects.



Sometimes it looks a little like architecture...



Here from concept to model.


Here is a preview of a new speaker.


A cabinet is more than box, it rather an acoustic system.


It is as critical and complicated as any other component however this is often overlooked. Many believe it is all about the components but the hierarchy of 1) design, 2) layout and 3) component quality is just as true here as it is in electronics - in my humble opinion.


The box or monkey coffin has been over used due to its simplicity in design and construction.


Computer aided design and manufacture will hopefully lead us onward however there is no substitute for inspiration and insight.


Still, there is no substitute for wood and other natural materials either and thus no magic bullet. It takes talent and work to chord the modern with the ancient in pursuit of harmony.

Which is what the entire pursuit is - the exploration of harmony and musical expression.

We accept commissions for 3D design work - for both 3D modelling and 3D printing. If you have a project that you would like us to help you with please contact us.



Friday, 25 May 2018

Munich High End 2018 - The Summing Up



 It was all about tubes, horns and spinning disks of vinyl and lacquer ....

Our room made a lot of music.



The purple amps really grew on me over the course of the show. What seemed outlandish at first become more and more elegant with time.


The unassuming and high performing D3A. We enjoyed lots of great music through this little tube in the phono section.


The red field coil Mojos


New Elrog 274 rectifiers...


Elrog in a row made quite a show.


Lovely to see.


Music! 78s and LPs were everywhere...


The orange chassis was perfect post modern...


Purple was unusual and a very cool appearance.


More Elrog rectifier glow.




In a row.


Globe 46s - 46 drives 46 - these were a treat from Herr Mayer. Very rare and sounding fantastic.


Oops, the line stage I was lusting after... is glowing in my listening room today. More to follow on that!


Array of Line Stage rectifiers.



Elrog 211


The Field Coil Mojo was very popular.


We shall also be in Hong Kong thus August!


Please come see us with Elrog, Thomas Mayer and Thomas Schick!


My Thanks to Thomas Mayer of VinylSavor / Elrog Tubes for having us at the show, Peter Rienders of PTP Audio for bringing his awesome Lenco inspired turntables and Frank who so generously shares his 78 RPM collection and the history that goes with them.



Until next time... Happy Listening.