hey what do u mean by reverse the polarity? by switching the RCA L & R? does that affect the direction? i thought you have to change the end that goes into the amp to the HU and the end that goes into the HU to the amp.
or u mean the reverse the amp to 180degrees phase? or whatever its called... my amp dont have that feature. but i did play around with my amp just now and i think the sub sounds much better. i didnt change the gain, just bass boost from zero and i just touched abit of it, hardly any movement felt, and the sub came alive!
Sorry, I thought u r talk about speaker cable, RCA i'm not sure but should be the same theory:
Just reverse the RCA heads attached both way. You're LR will remain unchanged then hear the different, if it's like what we heard in speaker cable then should be same.
(Ps: speaker cable's positive is forwarding signal while negative is the other way round. That's why, we examined this b4.)
Honestly if you like good sound, less distorted sound, better phase, I would say, please, EQ bass boost loudness etc, off it.