Chris,
It may be the recording - studios will add euphonics to voices to give them a richer or fuller sound. It is impossible to say. This is one of the reasons there is so much confusion or misinformation in audio. Naturally everyone tries to draw a conclusions but without a reference type system it is impossible to say (most consumer systems are designed above all to be pleasing to the owner/buyer - accuracy is not the objective of many of these designs)
If you played a number of familiar recordings and came up with the same syrupy euphonic observation then you could conclude it was probably the source, the amp or the speakers or all three combined.
It may be the recording - studios will add euphonics to voices to give them a richer or fuller sound. It is impossible to say. This is one of the reasons there is so much confusion or misinformation in audio. Naturally everyone tries to draw a conclusions but without a reference type system it is impossible to say (most consumer systems are designed above all to be pleasing to the owner/buyer - accuracy is not the objective of many of these designs)
If you played a number of familiar recordings and came up with the same syrupy euphonic observation then you could conclude it was probably the source, the amp or the speakers or all three combined.