◆ 4-inch 18-inch ultra-high-power voice coil bass speaker cabinet design using compression remote ◆ 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, bass surging shock, the performances, the best choice for entertainment