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常见的胆机后级是变压器输出的形式，是为了降低电子管的输出内阻，并容易和各种阻抗的音箱匹配。但是变压器输出的问题是低频的相位滞后以及高频的衰减，如果以更高规格的数码音源格式来衡量胆机带宽，很显然，胆机的上限频率的余量就差些了。Ａｔｍａ－Ｓｐｈｅｒｅ是一个美
A common post-amplifier is the transformer output form, is to reduce the output tube resistance, and easy to match a variety of impedance speakers. However, the output of the transformer is low-frequency phase lag and high-frequency attenuation, if the higher specifications of the digital audio format to measure the bandwidth of the amplifier, it is clear that the upper limit of the amplifier frequency margin less. Atma-Sphere is a beauty