Key Points: This device is a 30W, five-speed adjustable amplifier with 8Ω fixed resistance, supporting input voltages of 70V-100V. It features a compact design (195*142*93MM) with an ABS shell and aluminum alloy dustproof net, weighing 1.3KG. Its sensitivity is 90dB, offering power options of 20W/10W/6W/3W.