Oh please... I don't know whether to laugh or cry..

Having heard for myself a good few examples of Phono 1's, Phono 2's with one and then two power supplies, I put the 'deep bass' down to the difference the power supplies make. In this design, I just found adding the extra supplies seems to detach the music reproduction from the mechanics of the job at hand - a very clumsy way of describing it, but I suspect this is one reason why expensive phono stages exist over cheap, wall-wart powered examples. What did surprise me though, was how supposedly humble op-amps respond to larger capacity supplies, something I never deemed would be an issue in low level circuits like this. Again, I'm talking out of my comfort zone here, but the differences are there and clearly audible to those who've compared them, for whatever reason...

I heard an early Jez (Arkless) phono stage in my system and was disappointed by the sound. It came with a puny wallwart power supply. When I pointed out to him and that a beefier PSU would undoubtedly help, I received a barrage of the usual Jez-type abuse.

I have grown to understand that almost any component performs better with an over-engineered power supply, whomever it's designed by. Music signal is modulated power. There is no such thing as infinite PSRR. Etc.

A good properly design power supply is not just a correctly spec'd Tx put the matching chain of components that it is attached to before it reaches it's finial destination imho