I have one of the smaller ones and it sounds good very good indeed and surprisingly loud (85db sensitivity), for not alot of money you can buy a soundbar, logitech,creative (pc speaker) killer
http://www.doukaudio.com/douk-audio-100w-mini-bluetooth-50-hifi-power-amplifier-stereo-amp-treble-bass-p0174.html
http://www.doukaudio.com/douk-audio-100w-mini-bluetooth-50-hifi-power-amplifier-stereo-amp-treble-bass-p0174.html