If my front speaker B&W 804D already bypass to Accuphase E-460, is it no difference to upgrade my av amp from Pioneer LX-82 to Denon A1HD? My centre speaker is B&W HTM62 and surround speaker is B&W DS3
Flagship AV Amp will definitely gives you the power to drive other speakers...... not just the power, but the details will also be increased. But you should also bear in mind to upgrade the cables at the same time.
But in fact, just my 2 cents... I don't think E-460 can drive your 804D well.....