I'm a jazz singer, playing all sizes if venue but I got 2 voicesolo 150's for smaller rooms. I try to play acoustic pianos, occasionally I take my roland v piano and play with via a mixer and 2x Bose L1s or via 2x Trace Elliott Acoustic Tr200s. For small boutique rooms I wanted the clarity and great fx of the 150 without lugging gear. I know if I take my small 8 channel Allen Heath mixer I'm covered for playing using the 150s as small pa speakers, but I prefer to travel light. Can I configure my 2x 150s without using a mixer, for vocals alone when playing acoustic piano, or indeed sending my v piano l&r outs to input 2 on both and still getting vocals on both l&r. Most times will just be needed for voice alone , when one is just not loud enough. Advice on configuration, welcome!!