Amps/subs can be easily hooked up to oem radio.
What you need;
Amp + install kit
Sub + box
Multimeter
Hi>Lo RF converter
Took hook up amp / sub into euro with oem radio first buy what's called a hi/Lo rf converter, usually around $15 online or from Jaycar.
What that does is takes two channels of high rf (normal speaker) and convert to low rf (RCA) which you use to aus the amp.
Wire the converter off the rear parcel shelf speakers, then re-power them with the amp. (4 channel amp) x2 channels to re power parcel shelf and two bridged at 4ohm for the sub.
Wiring the amp is easy, main power off the battery, remote wired off the "switched" +12v line at the ignition barrel and then the earth for the amp.
The whole lot should only take you about an hour to install. At least that's how long mine took.
Never removed the parcel shelf though.
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