Sub woofer volume too low with new RX-A1020

This is being written from the point of view of a Denon AVR (just to provide some assistance to you) so the terminology your model uses may be somewhat different. In order to use "bass management" (not YPAO as that is the EQ for both the speakers and sub) the FL/FR speakers must be set to SMALL (or LARGE/LFE+Main)/80Hz in order for the lower bass frequencies to pass to the sub, otherwise, if they are set to LARGE, they cannot pass to the sub (unless set to LFE+Main). After running YPAO, the AVR may set the FL/FR speakers to LARGE simply because the AVR detects they can handle lower frequencies < 50Hz or so; however, you are better served resetting them back to SMALL and/or 80Hz to provide more headroom to the AVR as the sub is generally far more capable (and has its own power amp) to handle the lower frequencies. If the sub is working properly, normally the gain should end up about 1/3 (10 o'clock) for a good 75db calibration. Check the Owner's manual and reset the AVR. Set the sub gain to about 1/3 and run YPAO again.