On the NAPSC, that would be used to power the 202 and then I could use the AUX to power either the headline or the stageline? I’m sure I read somewhere that the headline needs an external power supply.
The NAPSC runs the control circuitry in the 202. The 202 preamp power is coming from the single 24v rail from the 155. Upgrading to a Hicap DR as Chris suggests, allows the powering of the preamp via 2x 24v rails instead. It also frees up the 155 from powering the 202.
You can run the Stageline from the powered Aux 2 socket on the 202 or from another Hicap (or Flatcap or Supercap). The Headline needs its own separate power supply (NAPSC, Flatcap, Hicap, Supercap) and can’t be powered via the 202.
In which case I would definitely audition a Stageline. Very happy with mine.
You ask about upgrading the NAP155XS. I did. I have a NAP200DR. This gives some of the benefits of the HCDR that I mentioned earlier as well as more power, without having a HCDR if that makes sense. Obviously the combo with the HCDR would be better. Depends on how important all this is to you, depth of pockets etc.
I’m a huge fan of the 202/200 in general. This is because a dealer whose opinion I value dearly, once told me years ago that 202/200 is ‘where the value starts with Naim.’