Bryston 3-Way switchbox

We recently upgraded to a McIntosh 6600 integrated amp with B&W 805S speakers and are very happy with the results. The only problem is we previously had a multi-zone amplifier that although not the quality of the McIntosh, provided music throughout the lower level of our house, which we used primarily when entertaining. We thought that the upgraded dedicated 2 channel would offset this, but we do miss it. Has anyone tried a 3-way switch such as the Bryston and if so, did the sound quality suffer? The other speakers in this configuration are a/d/s 400 in-walls in the living room and the a/d/s 200's in the kitchen.
Would appreciate advice or any other possible configurations.