Op we were a Bryston dealer for years the 4b amplifier is good the 19 preamp is okay, a tube preamp will add a fuller midrange which will increase your sense of fullness at a lower volume level we know your loudspeakers well lone of our clients has them.
the Legacy fFocus or Aeris will give you what you are seeking
changing your preamp will really flesh out your sound.
Dave and Troy
Audio Intellect NJ
nj