The 8138 is an 8" ceiling speaker designed for use with a pre-install inceiling backcan, resulting in highfidelity performance at a costeffective price point. The 8138 is ideal for a wide variety of commercial sound applications from restaurant and retail to professional offices and reception areas.<br><br>The built-in 6 Watt transformer allows use on 70V or 100V distributed speaker lines. High sensitivity of 97 dB delivers maximum sound levels using minimal amplifier power, allowing the use of smaller power amplifiers compared to when using lower sensitivity drivers.<br><br>The driver features a 25 mm (1 in) voicecoil with Kapton coil former for reliability.

The treated cloth surround provides deeper bass response compared with typical paper-roll surrounds, for fuller sound quality.<br><br>The 8138 fits the MTC-81BB8 backcan and MTC-81TB8 tile bridge, or can be used with most in-ceiling backcan/tile bridge systems designed with four mounting points on a 286 mm (11¼ in) diameter mounti This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-025-1051, indicating validated use in U.S. government and defense logistics supply chains.