Adamantes III 25th .1 Adamantes III 25TH .2



Adamantes III 25th joins Diapason family to celebrate Adamantes worldwide famous speaker anniversary, designed in 1989 by Alessandro Schiavi and well-known for its diamond multi-faceted full-wood cabinet, owing its name to old Greek word meaning “diamond”. Adamantes has been a revolutionary and always modern design since 25 years ago.

Speaker-shape design was especially realized in order to match astonishing and realistic sound performance with Italian cabinet craftsmanship. This makes each speaker a unique and precious piece-of-art.

Full wood cabinet is engraved standing out multifaceted front and rear baffles in order to provide a circular emission of sound waves around the loudspeaker and to give a close approximation to the theoretical ideal of point-source radiation. Sound performance is impressive in terms of 3-dimensional feeling: the loudspeaker quite simply ‚Äòdisappears‚Äô from the scene, giving the listener the sensation of a highly realistic virtual soundstage.

Closer to cabinet shape study of the Diapason flagship Astera, the front multifaceted panel of the Adamantes III 25th is provided with different angles compared to previous version Adamantes III, improving drivers emission and allowing more cabinet thickness. As a result of this improvement sound performance is considerably rich of harmonics, more controlled in cabinet resonances and capable to give realistic emotional feeling close to live musical events.

The original Diapason stands are recommended together with Adamantes III 25th and Karis NW, since they contribute to the superb sound and aesthetical value.
The 63 cm. 3/P stand patented design removes cabinet vibrations by transferring them away from the speaker to the floor through three steel support bars. The wooden 3 columns shape works just as external structure since the speaker is isolated from the ground by stell bars only. The 75 cm. 2/B stand is made of a heavy metal and wood structure . The 2/B is provided with 4 cm spikes under the bottom base, making the stand ideal for use on carpet floor.


Frequency response:
40/20.000 Hz
Bass driver
170 mm polymetylpentene
Diapason Direct Drive
20 mm treated silk soft dome

91 dB/1W/1m

Freq. crossover
4.600 Hz

Nominal impedance
6 Ohm
Min impedance
3,4 Ohm/200 Hz
rear-ported reflex speaker

Canaletto walnut solid wood Water natural paint finishing

Weight per speaker
8.5 Kg

Dimensions speaker
240x360x365 mm
cloth cover grille


Rainer Israel of Friends Of Audio first noticed the Diapason brand visiting Mastersound’s Northern Italian cabinet maker who crafts the valve amp’s wooden cheeks. “While in the shop I noticed absolutely gorgeous and quite far-out speaker chassis”. Those piqued his interest. He quickly contacted Alessandro Schiavi responsible for the Diapason speakers. Being into ‚’made in Italy’, the cosmetic, tactile and acoustic virtues of the speakers convinced him to take on importation. Though the brand dates back to 1987, I wasn’t hip to it. It’s impossible to know everything of course and for Germany, Diapason is far more recent to save my face.

Still, I can confirm the magnetism of interest this speaker radiates. And, who else works in solid wood and finishes off so heavily faceted? The company is based in Lombardia, more precisely the city of Brescia, about 30km west of the Garda Lake where Schiavi finished his piano, organ and electro-technical studies during the 80s and stayed on. Arriving at hifi came via the pro detour. As recording engineer for various studios, he soon wanted to master with his own read, better location monitors. When the outcome attracted attention outside the studio, a business developed which in the spring of 2010 holds three models in its Reference Series. The Adamante sits in the middle but is perhaps the most mature. It’s been in the lineup for 20 years. The current incarnation goes by MkIII. While form factor and concept remain unchanged from the beginning, driver complement and crossover didn’t. Today’s transducers for this Southern belle come from the North Norway’s Seas for the 12cm poly membrane mid/woofer, Denmark’s ScanSpeak for the 19mm silk dome.  Read More