I'm using Definitive Technology BP 8040 speakers with my Outlaw RR2150. Seems to be an excellent match in my 8 X 13 listening room. Haven't fully vetted the right settings and positions of the speakers yet, but working on it.
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Outlaw RR2150, Definitive BP8040 speakers (2), Behringer 9 band graphic equalizer. Music sources: CDs, ripped CDs, MP3, some FLAC via desktop computer; tablets via Bluetooth receiver on Outlaw amp.