Tbg, I would agree too if it comes to the classic volume controls used in some current digital players. Let's say you have the best volume control built in your digital source which is a stepped attenuator with HOLCO, VISHAY or other exotic resistors. Let's assume the attenuator is about 10kOhm end to end. You will usually listen at 12 - 1 o clock which results in about half way trough the attenuator. This means that your output impedance will be about 5kOhm (kind of high). The result is lack of dynamics, added noise and smeared frequency response. Every time you turn that attenuator, it will change the output impedance of your machine. You can basically hear a sonic difference on every step since the output impedance is changing. This is the reason why when you buffer it with preamp it will sound better. The preamp has high input impedance and constant low impedance output (about or less than 200 Ohms) capable of driving your cables and amplifier. With attenuation done in the digital domain, there are no such negative effects as the output stage of the machine is directly connected to your amp through the IC cables - just like a preamplifier. The output impedance is constant and there are NO added components to the critical analog signal path.
Lastly, regardless of how perfect your preamp is, it would be best if it's not on the signal path. Now, if you like the added noise, distortions and "bloom" of a tube preamplifier this is up to you and your taste...:-)
Merry Christmas!
Alex
Lastly, regardless of how perfect your preamp is, it would be best if it's not on the signal path. Now, if you like the added noise, distortions and "bloom" of a tube preamplifier this is up to you and your taste...:-)
Merry Christmas!
Alex