The last frontier of Metamaterials

DPeR loudspeakers are based on the less known RJ load.

They are part of Helmholtz resonators, that is, they are cavities tuned to specific frequencies capable of conveying and re-entering part of the stored energy.

Although these systems are internally capable of supporting overcompensation pressure, when paired or used in RJ configuration (shielding panel housing the speaker opposite the resonator) they lose such capacity

This thus explains the reason why the RJ solution failed to be popular.

Starting from this simple observation, Collegia Opificum designed and developed a duct which, despite its simplicity, can perform multiple functions.

Coandă Effect
By using such principle at the basis of modern aerodynamic studies, the outgoing air flow from the resonator cavity is partly redirected along the column we designed.

This duct's peculiar geometry forces the air around it to slow down going through a fixed path, restoring the right level of pressure in the resonator.

It's about new emerging technology, developed since the 2000s.

Initially the attention of researchers was focused on developing new materials with peculiar electromagnetic properties.
Later on it was found that the concept could be also extended to geometric features and assembling features of a specific object.

Currently these studies find application in many fields, including the very audio sector.

Thanks to its peculiar design, DPeR offers decisive action in reconstructing soundstage.



- Complete absence of the typical “blow” of common reflex based loudspeakers.
- Higher driver skill of designated loudspeaker up to the limits of the applied power.
- Ability to take advantage of rear loudspeaker emission.
- The result is a speaker producing a unique, immersive sound, with a soundstage reconstruction that goes far beyond the size of the loudspeaker itself.