The low A on the PX-350 is the most powerful, full sounding and solid lowest note on a piano that I've ever heard!! I attached a .wav snippet from one of my songs demonstrating that powerful low A. I hope you can play it ok here. Believe me, I've tried all my other keyboards and VST's, and nothing comes close! So the Casio really makes that song pop!
LowestA_PX350MWE.wav
edit: plays on laptop but not iPhone for some reason.