Bridge rectifier low voltage
I will suggest an RLC filter than will only lose a couple volts. KVL indicates too much loss in DC for 80 dB 100Hz ripple attenuation.  If your amp has some PSRR in the preamp you may compute that or measure it and reduce all R’s to 2.2 Ohms for now.   When you come back with specs for DC drop and AC ripple, then a better sol’n is possible like an LDO or active filter.