Question: is my sub in phase with my main speakers.Im running it plus to plus Neg to Neg..
Mcgarick, not sure what you mean by this. It sounds like you are running a line-level signal via an unbalanced interconnect, with rca connectors, between preamp out and sub line-level in. Is that correct, and if so do you mean rca hot/center pin to rca hot/center pin, and rca ground/shell to rca ground/shell, rather than plus to plus and negative to negative?
And does the sub have inputs for both channels, which it sums together, or only for one channel, and if it is only one, how are you handling that?
Also, I think your post may be misleading Herman. If you have inverted preamp outputs feeding a non-inverting sub, and separately feeding a non-inverting power amp, and you have + and - interchanged on the main speakers, then your main speakers and the sub will indeed be out of phase.
Finally, if by "reversing the rca at the sub" you mean rewiring it so that the cable's center conductor is going to the ground shell, and the shield is going to the center pin, that would not be a good idea even if it were possible. You would be connecting the preamp's "hot" signal output to the signal ground of the sub, which would short the preamp output to ground if a path existed between sub ground and preamp ground (such as via their ac safety grounds if they both have 3-prong power plugs).
Then again, perhaps it is me who has been misled by your post :) In any event, clarifications of the questions I have raised would be helpful. And Herman's suggestion about checking volume levels with tones that are in a range of frequencies that would result in significant output from both main speakers and sub is an excellent one.
Regards,
-- Al