1. Ease and safety of operation, quick setup and dismantle; 2. An 18" speaker at the front and a 15" speaker at the back in the sub; 3. Cabinet box is made of Birch plywood; 4. Mounted one Sanway customized amplifier module D3-2CH in the subs; 5. Mounted one Sanway customized amplifier module D2L-TWO in the tops.