AcousticDesign Ceiling Mount Series
AcousticDesign AD-C42T

The ceiling mount 2-way co-axial system shall incorporate a 4 inch low frequency transducer and a 0.75 inch titanium tweeter. The tweeter shall be mounted slightly off-center relative to the woofer in order to reduce destructive interference. The co-axial system’s low frequency driver shall be loaded into a sealed enclosure.

The co-axial system shall meet the following performance criteria: frequency response of 72 Hz to 20.0 kHz ±6 dB, measured on axis with appropriate signal processing; sensitivity of 88.0 dB SPL in half space at 1 meter with an input of 2.83V; continuous output of 104.0 dB SPL; peak output of 110.0 dB SPL on axis at 1 meter; power handling of 40 watts for 8 hours with an IEC noise signal; recommended amplifier power of 80 watts; nominal impedance of 8 ohms.

The loudspeaker shall have a switchable low-distortion, wide-bandwidth laminated core transformer with taps for 30, 15, 7.5 & 3.8 watts at 70V and 30, 15 & 7.5 watts at 100V. The co-axial system shall be switchable between 8 Ohm and constant-voltage operation.

The loudspeaker shall have a steel enclosure. It shall have a white paintable finish. Input connectors shall be parallel wired ceramic block or 4-pin Euro terminals in a fire protective sub-chamber. The co-axial system shall have a rails and C-ring for ceiling installation. The front of the co-axial system shall be protected by an injection molded high-impact polystyrene grill.

The co-axial system's enclosure shall be 7.5 in (19.1 cm) high, 7.5 in (19.1 cm) wide and 8.9 in (22.6 cm) deep. The loudspeaker shall weigh no more than 6.1 lb (2.7 kg).

The loudspeaker shall exceed Mil Spec 810 for humidity, salt spray and dust; it shall meet the IEC 60529 IP-X3 splash rating. The loudspeaker shall be listed as safe for use in air-handling spaces under UL1480 and UL2043. The switchable transformer shall be listed under UL1876 and shall comply with BS/EN 60849 safety standards.

The ceiling mount 2-way co-axial system shall be the QSC Audio Products AD-C42T.