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Yes you are correct, normally aftermarket amps do require rca connections between the HU and amps, however, the bose system does not. Connections between the bose HU and bose amp are hard wired , it does not use rca's. The bose bass amp is also hard wired to the speaker amp. So in your words i guess its "goofy bose wiring". Below is an official 350z stereo wiring diagram for bose units.
So to answer you originall question "How can I use the bose amp/sub without buying a PAC interface?"
If you want to install an aftermarket HU and speakers , simply replace the HU using the correct harness for your HU and repace the stock speakers with your aftermarket. They will run of the stock amps. Yes Bose typically have an ohm rating that does not conform to industry standrads, it is usually higher or lower and a PAC module will correct the difference in ohms. however, i went without and have had no problems.
Pretty much just plug n play. I was originally going to replace the amps as well but after hearing how it sounded with the aftermarket HU and speakers i left it.
I dont think the amp is connected via RCA's, just normal wiring. I went without the PAC interface and it works perfectly. The only thing i've noticed that the volume increments aren't as smooth, but no biggy. Have had no problems with resistance or voltage so far. Been 2 months since the install.
The stock amp and sub run off the same power on wire. All the speakers come from the Amp with signal wires from amp to HU. Stock sub works great IMO. Not overly loud or in your face. Though you'll get a big sound change from upgrading your HU and speakers.
If you deciede to use stock speaker cables installation is easy. Just plug n play. other wise running cables will take a bit of time. Especially through the front doors.
My is a pioneer avh-p4350dvd 2011 model. Im pretty sure all the 2011/ 2010 models was a case of grounding the handbrake wire. Was told by audio dealer that the older pioneer models needed a relay but the newer ones were easily bypassed. Not sure about the current 4400 models though. Would be interesting to know.