The S52 of the SIGN series is an invisible loudspeaker with dimensions (WxHxD) mm 366x466x11, a nominal power of 100 Watt and a nominal impedance of 4 Ohm. Thanks to the specific AudioPanel technology, the Sign S52 is recommended for use in systems where, in addition to the sound system, it is necessary to broadcast any alarm (on a dedicated audio channel) by exploiting the "surprise" effect caused by a hidden sound source