Sr 003 mk2 + sr 252s sound quality if you put Iphone as source is NOT that good as my
Sr 002 + srm 002.
you must use as source like your desktop rigs for example : CD player and is better if you
add Dac and use your CD player as transport ,
with this set up your sr 003 + Srm 252s must better than sr 002 + Srm 002
you can feel like Stax sr 007 mk2.
please try with CD player .
I've been using lossless music => audirvana plus on a dedicated mac => audiophileo 1 USB converter with purepower upgrade => audio-gd reference 7 DAC rather than just iphone. I think burn-in HAS helped although i suspect the improvement lies more in the amp section.
On a side note..... i've been reading about LL/BHSE and 009 last night.... oh gawd... this is an aweful addiction....