Receiver is a Sony STR-DH820. It has 2 RCA subwoofer outputs.
Sub is a Polk Audio DSW Pro 600. It has RCA inputs and LFE input.
Room was pre-wired with RG6 Coax in the corner for the sub. I believe I have all the connections converted to F type correctly, however when it is hooked up the connection is very weak. This is using one of the subwoofer RCA outs (either one) and the LFE input. After running the auto calibration software in my receiver, it sets my subwoofer channel to +10dB. You have to pretty much max out the subwoofer gain/volume to know it's even there.
Alternatively, If I run a set of stereo RCA cables instead and use the stereo RCA inputs on the subwoofer it's actually a little overpowering. Auto Calibration wants to put -10 dB on the subwoofer, and I can run the volume at 50-60% with very fantastic results. I've since bumped up the channel to -6.5 dB because I prefer move bass. I do not notice any bottoming out or other clipping issues. I'd be happy with this if it didn't mean I'd have to re-run a new wire through top plates and insulation.
So I'm not sure what the problem is. Seems to be the RG6 wiring and connectors, or the LFE input on the sub, or some hidden setting in the receiver.
So are my F to RG6 and back to F connections in question? I get a signal, just a weak one. I believe I have a good connection on the center copper, but not sure if I was supposed to get better contact with the outer shielding/wrapping. I used twist on style RG6 terminals and it's the first time I've ever messed with that, but I'm confident the center copper has good contact.
Or, I'm thinking the Sony subwoofer outputs are not producing the +10 dB LFE spec channel. Auto Calibration software did set all my speakers to "large" so I wonder if that's why the sub channel is weak. I'll try that tomorrow, but I'm using the same outputs. Just a single RCA to LFE (bad) or dual RCA on both ends (good).
Or maybe I'm missing something obvious?
Warning: I make a lot of mistakes but occasionally I learn from them!