A few years ago we met some people who shared our same passion for good music.
This passion, together with their specific technical skills and their possibility of attending the laboratories of Cosmed Engineering, led them to an out-and-out activity of research aimed at improving the sound of speaker-cabinets.
Their research work, also thanks to the comparison among different installations,  enabled them to work out a theory on how to improve the quality of sound.
This theory derives from the observation that the human ear is very sensitive to the delay with which an undesired “tail” of the original signal reaches the ear.
“Tails” originating from various resonance and reflections typical of loudspeakers are the main cause of unfaithful sound reproduction.

Preliminary tests made on our current production loudspeakers have attested that modifications aimed at reducing resonance and reflections actually managed to sensibly increase the quality of sound and incredibly improve the capacity of faithfully reproducing the musical setting.

And that’s how the collaboration between SICA ALTOPARLANTI and Cosmed Engineering began, with the purpose of designing high quality loudspeakers for High-Fidelity and studio monitor.

The complexity of all the measurements and the need for   theoretic contribution from bodies outside our company  then led us to ask for the advice of the Institute of Acoustics “O.M. Corbino “ of the Italian Research Council. The Council has assisted our engineers in Time Domain Measurements and in the theoretical verification of the several steps of the project.
During the development, special attention was paid to avoid any implementation that could compromise the uniformity and reliability of the product, characteristics that are just as important as the timbre quality.

In the tweeter model LP 90.28/N92 TW (code Z009160) that we are now presenting,  all the significant interventions perfected in this study have been applied.

Besides the characteristics of our customary data-sheet, among which we point out the resonance frequency of 600 Hz only and the sensitivity of 95 Db@1W/1m, we underline the peerless clear and clean sound achieved thanks to an almost absolute control of the internal reflections and of the mechanic and acoustic resonance.

In fact all the resonant minor cavities that influence the high range band have been reduced to their lowest levels, while the major cavities have been enlarged and dumped so to move their effects below the useful band.

The dome, which looks like a common silk dome,  benefits indeed from additional treatments with purposely-made dumping materials  that minimize spurious vibrations typical of silk domes, obtaining a compound element that considerably stiffens its structure.

The particularly low resonance frequency, that allows its use starting from 1.500 Hz, has imposed us  to design a magnet circuit with perfectly balanced flux.
This flux, together with the high inductance, enables excellent signal control even at frequencies around the resonance.

The graph of signal decay time indicates, better than words,  the good results of the actions we’ve carried out.

Since this loudspeaker was designed for professional applications, we also asked ourselves how to solve the problem of dissipating the heat generated by long-continued use, seeing as the use of a neodymium magnet has considerably decreased the mass.
We adopted the solution of using aluminium for parts like the front flange and the rear cap, that therefore act now as real radiant elements.

The listening tests, performed together with both small and bigger woofers, confirmed the good project results, allowing us and our consultants to appreciate nuances in music reproduction that remain unvoiced as with very expensive systems.

test hobby hifi