Not sure using it for instruments was it's primary purpose, but it has at least one instrument jack, is recheargeable, and At 50 watts seems like a versatile unit. Lots of factory refurbs available....hmmm! Anyone try it?
http://www.ionaudio.com/products/details/block-rocker-bluetooth-ipa56c
http://www.ionaudio.com/products/details/block-rocker-bluetooth-ipa56c