Hearing is believing and the Contendo II from Aries Cerat is beyond anything that has come before it.

The four way design is 100% passively driven, and the crossover is passive.

The tweeter covers 2.500~100,000Hz and is filtered by a filter we have been developing for a while, the constant group delay filter. This filter prioritises a linear(constant)( as much as physically and mathematically possible) group delay in the stopband.

The midrange filter (600Hz, 2500Hz) is also using constant group delay passband filters.

The mid-bass filter (100, 600Hz) is asymmetric with constant GD for the low pass section

Bass horns have their own filter (100Hz ) with no EQ and no shelve/boosting filters. The bass-horns run as low as their natural bass-horn acoustic loading allows, no tricks used (usually the norm in active bass-horns) to boost low end.

Now for the true tricky part.(One may wonder why the crossover has power inlets)
The complete crossover, is reconfigurable , on the fly, using a complex circuit , controlled by specially designed circuit, and an Android Bluetooth application. All circuits and application developed in house of course.

This is not an active system , no dsp or A/D/A conversion made. All filters are analog passive circuits. The controller activates and switches a complicated array of components, (capacitors, multiple coils and transformers) to control many parameters of the design.

By doing so, the user, if they please doing so, while sitting in their listening spot, can tune the speaker to better suit their personal taste and most importantly , room.While using the phone application.

As an example of parameters a user can alter, is the power response of the midbass, the midrange, the bass horns (all independently), the group delay optimisation of the tweeter,slopes between midbass and bass, slopes between mid and midbass among others.( there are some a bit more advance settings , but these are the main to be used by the user)

The level of the midbass and midrange can be adjusted using a multitap transformer, again controlled by the app.


The four independant inputs of the crossover allows for multimapping of course, a feat we used in our lab (using multiple Essentias)

More info to follow.