I suggest you put another Cobra or Custom Power Cord Company instead of HT,then replace Transparent cables with Cardas Golden Cross or Golden Reference(Rowland uses Cardas wires,I guess),after that replace your preamp. with Rowland,and only then think about better Rowlands and battery packs.By the way,you didn't tell us what speakers you use.I envy you anyway,Rowlands are so good.Any of them.