Coupled with my Galaxy S4 I tested MP3 (128kbit / s) via Toslink to my stereo. Natürllich you can on the amplifier bass and treble as desired reindrehen but with linear adjustment of the sound is a bit thin. About lack of coverage I can not complain about it. The cross has to work through the house by concrete slabs 1a. Conclusion: It's alright, but the sound quality really too expensive.