I don't know if a subwoofer solves the problem but if I purchase from music direct they have 30 return policy.Then I would finally replace the synchrony II if need be.
Also I'm curious what the subwoofer will sound like with these speakers
When I go to NYC Saturday I'll have a better idea what other speakers sound like concerning deep bass.
But as my origional statement suggests,I was delighted with my sound until it would change