The Topping preamp's channel separation was superb, at 110dB in both equally directions underneath 2kHz, and lowered only somewhat, to 90dB at the top of the audioband.港珠澳大橋的開通，大大縮短了香港與珠海之間的距離。「金巴」，即港珠澳大橋穿梭巴士，正是連接香港、澳門及珠海三地的主要交通�