12v linear power supply

Ah. I understud Amps now.  All I need is the 2a :)

I always over spec my lps, less stressed, better reliability. So, you need 2amp, I'd get lps that could supply at least 4amp. I see too many posts of poor experience with lps, always because people purchasing lps that can only maximally supply needed amps, heat and stress lead to failure. Don't cheap out on lps!

ifi iPower Elite

I got good results on my Roon Nucleus+,

I too recommend the iPower Elite. Comparable to my UltraCap 1.2 and  Teddy Pardo HiCap.

And it should drive whatever you got at 4 amps.

Most DACs or preamps or small a/v devices will use less than 1 amp, so a 2A linear power supply will be just fine.  If you want to go for a 4A, it will not hurt anything. 

If you have something like a video processor device (such as Lumegan) or a computer type device like Roon or Intel Nuc, then you may want a power supply that can provide more amps.  The Keces P8 that provides 8A is the most powerful linear power supply I know of, but it's $900 retail! lol.

The Swagman is at a similar level to the Teradak and Zerozone power supplies.  They are just fine, but not as good as Sbooster.  I think one of the better supplies is the Farad Super 3, but that is also expensive at around $600 or so.