The Peachtree Audio deepblue2
will give you a smooth and clear sound along with good bass by virtue of its 5 driver array (1 x 6.5", 2 x 3" and 2 x 1" silk dome), 440W amplifier and sealed enclosure. The 6.5" woofer is run in mono and although 440W seems a bit like overkill, it also insures you will have enough amplifier headroom, which many Bluetooth amplified speakers don't.
It's being offered on special at $350 from its $500 MSRP.
If you're interested, you may want to read the Inner Fidelity review
which explains the EQ curves designed into the volume control steps and how best to balance deepblue2
volume and source volume for consistent frequency response.