While I absolutely agree that the speakers are probably the main culprit, they are not the first thing I would try changing. The first thing I would try is changing the sovtek 6922 for either a NOS Tunsgram, Siemens-Halske, or Mullard. This would cost less and might change the sound enough to fix the problem. If not, you can always change the speakers later. There are lots of good small speakers out there, but I too would suggest one of the better British brands such as Harbeth, Spendor, or Wilson-Benesch.