Wow. Great question. My system consist of, Sota Star Saphire TT, with SME IV arm and Blackbird cartridge into an AR PH-3 phone stage, AR REF 3 pre-amp, McIntosh Labs MS 300 music server into a Theta DSPro Gen II DAC, Pereaux TU-1 Tuner, Pioneer Elite DV-09 DVD/CD player into a Theta DSP Gen V DAC, Martin Logan Monolith IIIX electronic crossover, into a Mark Levinson ML-3 amp for the bass drivers of my ML Monolith IIIX speakers and either 1) Audio Research VTM 120 Mono Amps or my Mark Levinson 23.5 Amp driving the upper panels of the Martin Logan Monolith IIIX speakers. Cables are MIT, XLO, Transparent, Canare, etc. Also, for the naysayers, the Pioneer Elite DV-09 is in my opinion one of the best transports I have ever heard and I have heard some really good ones. It is built like a tank, really, seriously overbuilt, vacumed sealed and compared to the seven (really!)cd player/transports that I have listened to into the DAC, it blew each and every one of them away.
Now to the sound of the SP-16 compared to the SP-11. The SP-16 was constrained, not open, soundstage was small, bass was not good. Sorry, but my audiophile vocabulary is lacking. When I played, Eva Cassidy or Marilyn Scott, or Pat Metheny, etc. on the SP-11 and then played the same on the SP-16, it was the biggest difference I have ever heard in comparisons. Also, my when I was speaking with my Dealer about possibly getting a remote controlled pre-amp to replace my SP-11 (possibly) he told me that the SP-16 would be close. He later admitted that he forgot that the SP-11 was the top-of-the line AR pre-amp of the time and that the Sp-16 was basically AR's entry level pre-amp. Fortunatly, his store routinely allows me to take equipment home for a week at a time and audition before I buy. I kept coming back to the REF 3. It was really smooth.
enjoy