Hey buddy, nice choice with the Yamaha's! With out a doubt the speakers should output the same level and since you had one floor model, I'd take them back. Your right having the speaker in the corner will effect the bass response and maybe just maybe a db but nothing drastic should change in level. Oh by the way, when you find another $350 lying around, GET THE SUB. Once you go sub you never go back. The Yamaha HS series offers a great 2.1