英国QUAD(国都) Platinum Mono 立体声单声道后级放大器

因为DMP本身带有数字音量控制，直接将DMP连接后级就能组成一套完整的音响系统，而且一套西装正为合适。Quad提供了两个选择，包括150W输出功率的Platinum Stereo立体声后级，以及180W的Platinum Mono单声道后级。前者采左右声道分离设计，可减少两声道间相互串音干扰，让声音更为纯净。若想更上层楼，选择使用一对单声道后级，不仅分离度会更好，输出功率也更高。

Dynamic performance is the key to musical behaviour. In Platinum the musical dynamics are maintained precisely by making sure that each amplification stage is fed by its own power supply. In that way the power rails for the preamplifier and driver circuits avoid modulation by, say, the current demands of the output stage.

Amplifier stages are normally linked by capacitors to take care of DC offsets. Unfortunately capacitors in the signal path degrade the purity of the music signal. In Platinum direct coupling of each stage is enabled by the use of a DC servo – a circuit that compensates for any unwanted DC voltage and removes it without affecting the music signal.