Originally Posted by
DiveDeepDog
I have both PTG ii and Art9, as you say its a natural step and along with AT's hierarchy the more you spend the better they get.
They have very similar traits with the 9 having even better articulated bass. On 1st listen it may appear leaner, when in fact its cleaner.
The Art7 is a bit off field with even lower output, I have AT37 with ruby cantilever which is its predecessor and it's noticeably quieter needing a few extra notches on the volume control.
If I were buying new, I'd consider the Shelter 501, also heard good things about Zyx but thats the one brand I've not got my hands on...yet[emoji38]