The SLCII is not a public address speaker, but it is capable of room filling sound.
For HiFi, you'll need to be able to re-equalize your device's output to correct for the deliberately distorted EQ that BOSE placed on the SLCII's amp.
Highest fidelity is achieved indoors, with player-out EQ adjustments and a 3.5mm hardwired connection. Bluetooth codecs just can't handle HiFi audio. Placement of the SLCII near a hardwall or near a hardwall corner increases bass response.