Not at all always true. It really depends on the driver stage of the source, which is often a cheap OP amp. Furthermore, volume controls on CDP are often in the digital spectrum, which means that when you lower the volume from full, you are affecting (lowering) the sampling rate of the digital signal.
There are sources out there that have real analog volume control and exellent driver stages... where a good pre-amp might just get in the way of the music, but I think it is more the exception than the rule.
There are sources out there that have real analog volume control and exellent driver stages... where a good pre-amp might just get in the way of the music, but I think it is more the exception than the rule.