Audio Setup - Help

[arcanis411]

So my mazda "knocks" relatively well. 2014 mazda 6 with a 10 inch sub and 4 kicker speakers. 1 rockford amp (500w) for the speakers and cant remember what it is for the sub, but its a kicker amp. Only problem is if the stereo is off, their is some whining I hear, even with the radio all the way down. Maybe because a $15 walmart line output converter? SHould I invest into one of the following? (problem 1)

http://www.amazon.com/Clarion-Mobile-Electronics-MCD360-Crossover/dp/B00069R0LM?ie=UTF8&colid=3C6B53QKWMFY3&coliid=I2XB5HMKTI022K&psc=1&ref_=wl_it_dp_o_pC_nS_ttl

http://www.amazon.com/AudioControl-Channel-Line-Out-Converter/dp/B002T4XR78?ie=UTF8&colid=3C6B53QKWMFY3&coliid=I1CFOZZIOW5K09&ref_=wl_it_dp_o_pC_nS_ttl

http://www.amazon.com/AudioControl-The-Epicenter-COLOR-Expander/dp/B005FMB7BE?ie=UTF8&colid=3C6B53QKWMFY3&coliid=I2TCWCE4VCEDFQ&ref_=wl_it_dp_o_pd_S_ttl

I want to outfit my 2009 Honda CRV EX-L. (problem 2)

I cannot have the sub in the back seat unless super enclosed in a cage off to the side or something (I have 2 huskies who enjoy the ride from time to time, plus when we fill the vehicle up to move and such). My guy who does this for a living says I can get under the seat subs, but he says it won't even be close to my Mazda's. I need this to knock though. What about the space the sub that was built into the honda has (it has a stock sub SOMEWHERE). Anyway, thank yiu

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[Baller95]

Yeah it could be the line out converter. I'd say go with the AudioControl LC6i or the Clarion.