FMM-101 is a miniature monitor module (a mere 1.3" (3.302 cm) H x 2.75" (6.985 cm) W x 0.5" (1.270 cm) D) used to supervise a Class B (Style B) circuit of dry-contact input devices.
The X-DA1500 is a 500W Class-D amplifier specifically designed for the X-618 PAVA system. This innovatively-designed product can automatically detect power supply errors during operation.