The Topping preamp's channel separation was superb, at 110dB in both equally directions down below 2kHz, and diminished only a bit, to 90dB at the highest from the audioband.不過，由於金巴通車時間較短，再加上受全球疫情影響曾減少班次，甚至停運過一段時間，讓很多人對港珠澳大橋穿梭巴士的服務不�