Not only is mtx a universal brand in the united states, it belongs to the mitek sound group, but it is also large in many brands, such as trans-vehicle sound, home sound, professional sound, and wire. The mitek sound group is quite large and its brands are very numerous, including those of mtx, xtant, costic, streetwires, atlas sound, dcm, esoteric, swx, magnum, etc., which are part of the car sound, and with the exception of mtx, xtant and costic are not too familiar. Xtant, on the higher route, was created from the base of the old american brand precisionpower, which was later incorporated into the mitek group, and whose extension machines and horns have been welcomed by many high-level equipment players and are currently represented at the national level by the honghum. Costic, originally a stand-alone brand, has also met the needs of many of the auto-sounding players with low-cost equipment, while its balanced high-end dr series, which has led to the peak of costic’s brand...