Single 15 sound ten single 18 subwoofer and double 15 sound that effect is good

These speakers are stage square speakers, very high power, not suitable for home use. (Home 12-inch 150W speakers can be, the bass is better than 15-inch speakers)

15-inch high-power speakers bass are not very good, the greater the power, the worse the bass.

Maybe there is a subwoofer with a little better bass.

But the subwoofer has a poor quality subwoofer, the bass effect is not good.

Different prices, different sound quality of the speakers.