The power output and speaker size is on paper fairly modest when compared to some other current Bluetooth speakers. But through some witchcraft Tivoli has made an audio masterpiece. It brings out the best of a good recording, but also exposes the flaws of a poor recording. One negative about mono is that if the recording has phasing issues, it can make some instruments (typically doubled guitar parts) sound quieter in the mix. The thing that still amazes me is the tight and present bass. I can’t believe a subwoofer that small could produce chest pounding bass. It is plenty loud and powerful to be your only home stereo. Overall the design is a bit strange to me. It’s portable and has a built in battery, but also very fragile with big dip switches and fragile EQ sliders on the front. For $600 this will never accompany on a camping trip etc. and the fact that the line in is on the front and is a stereo 1/4 jack. I think an RCA phono in on the back would be amazing. I think Tivoli should have considered just making it a stationary home audio system with an AC cord. I worry about the long term life of the battery and am uncertain whether Tivoli would replace it once it wears out? Overall it is a strange and wonderful piece of audio equipment. I am glad that I pulled the trigger on it even though there were no reviews at that time. And just to reiterate, the sound that comes out of this is nearly unbelievable. It is a delight to listen too and has made me “unplug” and kick back…