I am looking to liven up my 2 Sinfoni 150.2X's with a nice tube pre-amp. It might as well be the TC-4 as I'll need the x-over as it will mean bipassing the 3-way feature in my deck (Alpine CDA-9887). Any better pre-amp/x-overs (especially tube)? I am looking for serious Audiophile quality. But am not sold on the pink logo of the Milbert.