Grand Mezza 2006


The Opera Grand Mezza was not designed as an entry-level or even as "economic” system. The real purpose is to provide a quality speaker suitable for normal home use or in environments with large and medium-low power amplifiers (from tube 10 Watt RMS). Obviously this does not preclude the use of Opera Grand Mezza even in the largest and most powerful amplifiers (up to over 200 Watts RMS per channel) provided that the good quality and kept away from the condition of clipping. Grand Mezza is the natural evolution of the Opera Mezza (*). This is a floor standing system with two 5” reflex loaded woofer connected in quasi-parallel. The frequency response is calibrated to deliver great tone even at moderate volumes. The use of two woofers allows Opera Grand Mezza to improve the dynamics extending the response to low frequencies and increaseing the sensitivity. Conversely Grand Mezza is a 4 ohm system. Opera Grand Mezza can be used to create sophisticated home theater systems with or without sub-woofer.






Floorstanding, rear reflex duct


2 x 5” woofers – transparent cone


1 x 1”  Tweeter, silk dome, ferrofluid, decompressed


2 ways and a half

Frequency Responce:

40-20000 Hz


woofer: Quasi parallel with 12 dB/otc low-pass


Tweeter: 12 dB/oct


cross-over freq, 2300 Hz


140 watt RMS


from 10 to 70 Watt RMS without clipping


89 dB/1watt/1 meter

Nominal Impedance:

4 ohm (Z min > 3.2 ohm)

Position in room:

at least 20 cm from rear wall


At leat 30 cm from lateral walls

Size :

950 x 315 x 265 (cabinet)


19 Kg




Opera Grand Mezza 2006




Opera Grand Mezza is the natural evolution of the Opera Mezza. It is a “two-way and a half” floor standing diffuser with reflex load, characterised by a flat and wide frequency response and an unexpected low frequencies reproduction. Thanks to the very high quality, high dynamic drivers the price/quality ratio of this system is exceptional.


The cabinet


The cabinet of the Opera Grand 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, to maximize the reflex load, the reflex ducts is located on the rear panel very near the floor. Inside the cabinet there is a good quantity of acrylic sound absorbent material filling the upper section of the cabinet that controls the reflex Q factor and minimize the internal reflections.



The Components


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 two woofers, 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 polymeric diaphragm, rubber outer surround suspension and a PVC dust cup. The maximum displacement of the diaphragm exceed 10 mm. Two copper rings are fitted above and below the T-shaped pole piece: they stabilize the magnetic flux reduce distortion due to inductance variation. 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 4 ohm diffusers, the impedance does not go below 3.2 ohm. The electrical impedance modulus of Opera Mezzo is always over 3.2 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 Grand Mezza  is a nominal 4 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 SP uses a classic network with asymmetrical slopes.

The cross-over frequency is at about 2000 Hz and the sensitivity is 89 dB (2.83 V at one metre).


                                          Cross-Over Scheme



Room Position


Opera Grand Mezza  is a floor standing diffuser with rear reflex duct. The minimum distance from the rear wall needed for a correct reflex loading in only few centimetres. In any case, we advise against placing the diffuser in a corner and one needs to keep a minimum distance of at least 50 cm from the side walls. The best position within the surroundings has to be found experimentally.

In case two pairs of  diffusers are used, these must be connected as illustrated in the figure below (series connection).

Positioning and connection of two pairs of diffusers