Re: short rca's and "Y" splitters...
Well if theres electrical interference in the RCA (Alt Whine, etc.) you could upgrade it to one with more shielding / cost more money. But if you cant notice any audible diference in a cheapo 1 dollar rca cable then just leave it.
Car: 1999 Plymouth Neon
Head Unit: Alpine CDA-9853
Components: RE RE comps in some custom kick panels.
Subs: 1x Alpine Type R 1242D In a vented 33 hz 3cuft box. (redesiging)
Sub Amp: 1x Alpine MRD-M301 mono amp (400 rms/14.4volts @ 2ohms)
Speaker Amp: Infinity 7520a (97 rms x2 /14.4volts @ 4 ohms)