Most of the powered speakers like the Bose Compact and keyboards now are designed to accept headphone level signals (e.g. iPods, mp3/cd players, etc).
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Jim

SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9