有无谁知道pass xp系列前级有无增益方面的改进？去年pass xp-20音量值为63，主机可设置增益，今年生产的发现XP-20音量值为83，主机不能设置增益。
在pass官网上无说明！！只有如下一段：
The XP-10 and XP-20 are ultra high quality line-stage audio preamplifier featuring direct access remote control functions and in the case of the XP-20 an external power supply isolated from the analog circuits of the preamplifier in a cosmetically matched second chassis.
The Pass Laboratories XP-20 along with the XP-10 pre-amplifiers are the natural and more refined sounding descendants to the highly acclaimed and successful X series Preamplifiers represented by our models X0.2, X1 and X2.5.
Past accolades aside, the new XP pre-amp offerings from Pass Laboratories sound and measure significantly better than their immediate predecessors in the original X series. Are these the finest pre-amplifiers Pass Laboratories has built to date, absolutely and without question!
