本帖最后由 ue10 于 2022-9-8 21:59 编辑
不废话了，先把我收集的一些图纸贴出来！
这是主控板电路，是我重新画的
上面2个分别是正负项电流板的简化原理图，图中红框内的恒流源是在电源箱内，（先说明：我这个只是简化版的图，和XS的原理是一样，只不过XS并的大管数量更多电流更大）每只大管恒定在0.3A静态电流
请先看懂图，电流板正相+PHASE板，恒流源是加在正电源上，而负项电流板则是加在负项电源上！
我个人理解如下：他们在线路中的作用，使功放输出的正半周，其速度和幅度要远大于负半周！为什么这么做，我在A2的使用手册上看到如下文字（其实我早在之前提及过）：
就是更接近声音在空气中的传播特性，入耳更舒服！
One of the most interesting characteristicsof air is its single ended nature. Soundtraveling through air is the result of the gas equation 空气最有趣的特性之一是它的单端性。声音在空气中传播是气体方程的结果 PV1.4 = 1.26 X 104 where P is pressure and V is volume, andwhose curve is illustrated in fig. 1. The small nonlinearity which is the result of air's characteristic isnot generally judged to be significant at normal sound levels, and iscomparable to the distortion numbers of fine amplifiers. This distortion generally only becomes aconcern in the throats of horns, where the intense pressure levels are manytimes those at the mouth, and where the harmonic component can reach severalper cent 其中P是压力，V是体积，其曲线如图1所示。由于空气特性而产生的小的非线性通常在正常声级下并不显著，并且可以与精细放大器的失真数相媲美。这种失真通常只会在喇叭的喉部引起关注，因为喉部的强烈压力水平是嘴部的许多倍，而谐波成分可以达到百分之几 Fig. 1 shows the single ended nature ofair. We can push on it and raise thepressure an arbitrary amount, but we cannot pull on it. We can only let it relax and fill a space asit will; the pressure will never go below "0". As we push on air, the increase in pressureis greater than the corresponding decrease when we allow air to expand. This means that for a given 图1所示为空气的单端性质，我们可以推动它，使压力升高任意量，但我们不能拉动它。我们只能让它放松，让它充满空间；压力永远不会低于“0”。当我们推动空气时，压力的增加大于我们允许空气膨胀时相应的降低。这意味着。 motion of a diaphragm acting on air, thepositive pressure perturbations will be slightly greater than thenegative. From this we see that air isphase sensitive. 膜片运动对空气的作用，正压扰动将略大于负扰动。由此我们可以看出空气是相敏的。 As a result of its single ended nature, theharmonic content of air is primarily 2nd order, that is to say most of thedistortion of a single tone is second harmonic. The phase of this distortion reflects the higher positive pressure overthe negative. 由于其单端特性，空气中的谐波含量主要是二阶，也就是说，单音的大部分失真都是二次谐波。这种畸变的相位反映了正压大于负压。 Air's transfer curve also shows also thatit is monotonic, which is to say its distortion products decrease smoothly asthe acoustic level decreases. This is animportant element that has often been overlooked in audio design and isreflected in the poor quality of early solid state amplifiers and D/A and A/Dconverters. They are not monotonic: thedistortion increases as the level decreases. 空气的传输曲线也显示出它是单调的，也就是说它的畸变产物随着声级的降低而平滑地减小。这是音频设计中经常被忽视的一个重要因素，反映在早期的固态放大器、D/A和A/D转换器的质量较差。它们不是单调的：失真随着电平的降低而增加。
以上是使用百度翻译的，将就一点看，有高手能帮忙翻译更好！！ 不知道大家对PASS XS的恒流源搞法有什么别的理解，还请知道的高手们赐教！！！
补充内容 (2022-9-11 16:51):
这里说一下：电流板只是示意图，在原厂机中并管数量很多！ | 
发表于 2022-9-8 21:55
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