Waiting for the new Grand Mezza 2012
Mezza 2006 (discontinuous)
The Mezza is the smallest speaker in the Classica serie. This is a two-way bass-reflex system with only 8 liters which can be used on a stand or shelf. The listening point can be at 1.5 meters or even less from the speakers. The Mezza exhibit a extended, neutral and detailed sound on the entire spectrum. The Mezza quality come from high quality components: the woofer uses a linearized magnet system with T shaped central pole and two copper rings that increase significantly the linearity cutting down the distortion in the midrange. The linear displacement reaches 10 mm. The tweeter is the same mounted on the Callas SP and in all the Classica serie.
Opera Mezza is the smallest model of the “Classic Series”, even smaller then the Opera Prima: it is a two-way diffuser of about 8 internal litres with reflex load, constructed to be placed like a shelf or on a stand and characterised by a flat frequency response and an unexpected low frequencies reproduction.
The cabinet of the Opera Mezza is realised in finely-shaped MDF with rounded edges, veneered in real wood finely polished. The front panel is covered with synthetic hide that, beyond the aesthetic finish, also works as packing for the loudspeakers.
The size of the front panel, following Opera’s tradition, is large enough to hold the loudspeakers. In this case, being this diffuser created to be placed like a shelf, the reflex ducts is located on the rear panel. Inside the cabinet there is a good quantity of acrylic sound absorbent material that controls the reflex Q factor and minimize the internal reflections.
Also this model uses the same tweeter we find on other models of the Classical Series: it is a one inch tweeter (the same used in the Callas SP) with a silk dome, a wide rear decompression chamber and ferrofluid in the gap. The qualities of this SEAS tweeter are well known and appreciated. The woofer, also made by SEAS, come from the model ET15 developed for our Operetta Model. It is a 5 inches unit with 15cm chassis, 26mm voice coil on a Kapton former with a transparent polypropylene diaphragm, rubber outer surround suspension and a PVC dust cup. Two copper rings are fitted above and below the T-shaped pole piece: they reduce distortion and stabilize the magnetic flux. The cast chassis, of aerodynamic design, is fully open even beneath the inner suspension.
The Cross-Over Filter
In designing the “Classic Series”, particular attention has been paid to the electric impedance. In particular, we wanted to guarantee a load condition compatible with any type of amplifier.
In order to do so, the impedance minimums have been kept within the limits allowed by the DIN regulation that provides that, for the nominal 8 ohm diffusers, the impedance does not go below 6.4 ohm. The electrical impedance modulus of Opera Mezza is always over 6.2 ohm.
We believe that the cost of a diffuser has to be assessed together with the cost of the amplifier more suited to guide it. Opera Prima is a nominal 8 ohm diffuser that can be easily driven by a wide range of amplifiers, either with valves, solid or digital (Class D).
The cross-over of Opera Mezza uses a classic network with asymmetrical slopes.
The cross-over frequency is at about 2800 Hz and the sensitivity is 86 dB (2.83 V at one metre).
Opera Prima has been designed to be placed like a shelf but can also be used with a stand (available upon request). In any case, we advise against placing the diffuser in a corner and one needs to keep a minimum distance of at least 30 cm from the side walls. If the diffusers are put on stands, the best position within the surroundings has to be found experimentally.
In case two pairs of diffusers are used, these may be connected in parallel as illustrated in the figure below.
Positioning of two pairs of diffusers