If you have two G57s, why not try them in bridge mode and see what happens. If currently you only have one G57 working in stereo, then this will not work. There have been threads/comments in the past about G57s (and the earlier 557 and 559) where some users believe that the sound is "harder" in bridge mode. Instead, you could always buy new speakers!!

Meridian G08 CD Player, McIntosh C2300 valve pre-amp, 2 x McIntosh MC601 monoblocks, B&W 802Ds with IsoAcoustics GAIA 1s, AudioQuest Aspen speaker cables, Chord and Audioquest inter-connects, Shunyata power cables, Furman power conditioner, Sennheiser HD650 with Schiit Audio Asgard 3 Headamp