Sound excellent q9s stereo this audio advantage is, support bass adjustment, weight about 6.5KG is not heavy, but also 2.1 channel, the speaker is very beautiful, sound quality is very good to listen to, the high and low sound, the operation of the sensitive, very convenient, but the disadvantage is the type of power supply is battery-powered, which I do not like. This point I do not like, the overall down said the sound is big enough, clear layers, bass sinking soft, singing can reach the KTV professional effect. Sound Q9S is sound Q9 upgraded version of the real 2.1 channel, and is 5 speakers, three-way, wooden cabinet, surging powerful subwoofer, the degree of reduction is very high in the mid-range, clear texture sweet treble, adjustable high and low, accompaniment and singing instruments can be added to the reverb, accompaniment and singing instruments can be adjusted separately the sound of the sound of high and low, the real 110 decibels, up to 100 watts of high-power, both for square dancing, also suitable for musical instruments accompaniment, and can be used for square dancing, also suitable for instrumental accompaniment. For square dancing, also suitable for instrumental accompaniment, but also at home for music appreciation, sound quality is audiophile level, never general trolley speakers than. Can play U disk, can be connected to the cell phone Bluetooth playback, can be inserted into the TF playback, radio, recording, can eliminate the original sound of the song, wireless microphone distance of up to 30 meters or more. Upgraded sound Q9S, re-integrate the speaker panel function and remote control function, just use the remote control can be on the speaker, including audio volume, microphone volume, song selection, high and low adjustments, reverb adjustments, song acoustic elimination and other full range of control. The speaker can play for 6-8 hours on a single charge! Because of the use of lithium batteries rather than lead-acid batteries, making the speaker lighter weight, very easy to carry, with out of the house is very convenient to use! Moreover, the style is professional, generous and very good-looking.