Sp4 speker units (pair)

Sp4 sound boxes are best for outdoor uses like concert, dj party or other program where loudness is important.
my product is using 4 pieces of 15 inch Sound Blaster speaker(3.5"coil), 2 pieces of high frequency tweeter & 2 pieces of Sp4 Crossover(2 Low-pass and 1 high pass)
box material is 1" thick MDF ( H50"W21"D24") with full grill net. if u've a power amplifier that produce 3000-4000 watt sound then u can defiantly use this Sp4 sound system.