◆ 4-inch voice coil 15-inch high-power subwoofer, powerful bass ◆ Sturdy honeycomb steel mesh speaker protection against external shocks ◆ Box with high density plywood, hard finish to withstand all kinds of friction and collisions ◆ Acoustic shock absorbers, improve safety, improve quality ◆ Quick and easy to install security ◆ Natural tonal balance is the ideal equipment function rooms and KTV establishments