The SS ARC preamp short lived because it wasn't as good as its tube ARC preamp. ARC decided to moved back to tube gear. The SP-10 and 11 MKIIs are much better and much sought after than 8/6/3. In our setups, they sound fuller and more musical than the LS-16 and 25s. Since we don't have any balanced equipments, we never tried the LS-5s.