The 688 sounds like the SLVR , but lacks a small amount of the SLVR's bass response. At least that's what I hear so far. I have a SLVR on my digital source and a 688 on my preamp where the SLVR was briefly. I have another 688 cooking/breakin on my work puter monitor. My 688s were a HSRa and a HSRi that Bob upgraded to 688s.Even he says that the 688 is too good (close to SLVR ).
