An audiophile friend listening to my system did describe the 16 as having a golden color. I find the premier 16 to have a warmer fuller sound than the ET5. While the ET5 provides more detail or nuances to the music. An additional item to consider is the ET5 has a 100 ohm output impedance to the 16's 700 ohm output impedance. The ET5 will be a better match if you are using long interconnects or a solid state amp with a low input impedance. Both are great preamps (imho).
John
John