Product Features:

◆ 4-inch voice coil 18-inch high-power bass speaker 
◆ 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 sound surging