This compact 4" (127 mm) full-range speaker with an LT-72 transformer is equipped with a high-compliance, damped cone that provides excellent low-frequency reproduction and smooth extended response. The FC104 also offers a wide dispersion angle that reduces the number of speakers required to achieve full coverage in low-level distribution systems. The 10-watt, 8-ohm model (transformerless) offers a frequency response range of 150 Hz - 17 kHz, sensitivity of 94 dB (at 1 watt, 1 meter), and a dispersion angle of 135° (-6 dB, 2 kHz octave band). The unit contains a 10 oz (283 g) ceramic magnet with a flux density of 10,500 gauss. This U.S.-made speaker is available with six different factory-installed, line-compatible transformers (see table below) to meet a variety of project requirements. A dual-purpose bracket mounts securely to the speaker. securely holds the transformer in a low-profile position and allows for mounting of the torsion spring found on many AtlasIED baffles.