Square dancing outdoor trolley audio recommended?

Mom usually like to square dance, said to get an outdoor trolley audio, some time ago to help her research, more favorably Suoi SA-K37, which uses a wooden box structure, can effectively reduce resonance, so that the sound field performance is more mellow and powerful, but also equipped with an enlarged mesh mask, audio penetration is stronger, it is more than the ordinary mask enhancement of 80%. And it is equipped with remote dual-speaker sound unit, full-frequency non-resistive amplification of large horns. It has an enhanced digital power amplifier, as well as the guide hole design, but also makes the sound can be transmitted farther, wider coverage, the sound can cover 2500 square field, put on the square use, the effect is really great.