Some DACs have a built-in preamp. The question is whether the built-in preamp is of better quality than a dedicated preamp. So it is not an issue of 'purity' by running direct. Volume attenuation is a very complicated subject, with many manufacturers, each having their own approach.
The digital preamp within my Wadia was no match for a no-holds barred preamp like the BAT Rex. How could it be? The Rex is among the most over-engineered preamps on the market.
All preamps have strengths and weaknesses. You need to understand what you are looking for, pick a price point, and gather opinions on sonic characteristics. If your set-up is dry, two-dimensional, and analytical, then adding a decent tube preamp may be a real improvement.
Good luck,
Rob
The digital preamp within my Wadia was no match for a no-holds barred preamp like the BAT Rex. How could it be? The Rex is among the most over-engineered preamps on the market.
All preamps have strengths and weaknesses. You need to understand what you are looking for, pick a price point, and gather opinions on sonic characteristics. If your set-up is dry, two-dimensional, and analytical, then adding a decent tube preamp may be a real improvement.
Good luck,
Rob