Are you saying the SR4300 sounds different to the SR4200? That the latter has "amazing" power and the former sounds 'thin and pinched'? Because frankly I'd find that hard to believe.
They both go loud.
SR4200 sounded broken.
SR4300 sounded clean, but thin and pinched as stated above.
I would *expect* the SR4200 to sound very similar to the 4300, but through all the interference it was chucking out I can't tell.
So, by "amazing power"; I was trying to say it goes loud.