Have jvc rx-2020v receiver with mono rca out for sub and trying to hook it up with polk audio rm 1000 w sub woofer with +/- terminals for both left ane right channels plus blue terminal(?). How to?

SOURCE: Yamaha RX-V1200 subwoofer connection to Mirage BPS-150i subwoofer

just connect your subwoofer mono RCA to your amp sub single out rca connector. you do not need to megre all those 4terminals into one. in fact internal circuit of those 4rca are merging inside to one since the sub uses only a single amp. 4inputs was meant for sources with multiple sub out

SOURCE: I have a RX-v363 receiver all of the surround

The

• RX-V363

SOURCE: I own a Yamaha RX-V461 and since making a few

You can reset the settings to factory defaults via the Advanced menu - it should be in your manual (I have RX-V465).
Do it from the standby mode.
Press the STANDBY button on front panel (not remote) together with STRAIGHT button on the front panel. Now you are in the Advanced Setup. Scroll to the INIT menu and select ALL.
Now you will have all settings in the default.

SOURCE: I get no bass sound from sub-Woofer connected to Yamaha RX-V465

Check your speaker settings in Setup menu / Speaker Setup / Manual / Config (and then in this submenu also Equalizer).
In Config, choose where should low frequency sound go - subwoofer and/or front speakers (if they are big enough). The settings are: Bass Out: SWFR/Front/Both.
Also check Subwoofer phrase in SWFR Phase.
Check settings of all speakers, they can be Large / Small / None. If small, frequencies lower than "Crossover" settings, will not be put on them.

SOURCE: How do I hook up a non powered sub woofer on my htr-5630?

You will need an amplifier or 2 channel receiver. Hook the sub out rca jack to the rca inputs on this new amp or receiver and hook the speaker terminals on sub to speaker terminals on same amp or receiver. Your Yamaha receiver doesn't have any power for a passive sub.Just pick up any old fairly high powered receiver for fifty dollars and you're good to go.I use old dolby pro logic receivers as they are a dime a dozen today. Good luck.