If you like the Bose speaker a first step might be a high quality duplication of the 901 equalizer unit with mil spec components. After that a quality preamp; adcom does not qualify. Bose 901 speakers can sound quite nice with a custom equalizer AND correct setup. The correct setup is the hard part; just as bad as setting up a pair of Klipschorns..maybe harder..you need three solid surfaces to reflect the speakers from. Any glass does not count..curtains, too, bad, bad, bad.....
But, with a quality EQ and correct setup they have a nice sound. Still prefer Spendor, Audio Note, Harbeth, and so on.