That amp seems to support 2ohm and 4 ohm loads. You cannot get down to 2ohms with 2 8ohm loads (subs).
So, you need to wire them in parallel so that the load is divided among the resistance of their voice coils (2 8ohm paths means the driving circuitry (amp) experiences 4ohms of resistance because ... physics, basically). Wire the + and - terminals of the subs together and attach them at the amps + and - speaker output terminals.
DO NOT run them in series. 2 8ohm loads in a row means the amp sees the loads added together, 16ohm. And its not rated for that, you could blow the amp by making try to drive a load that is too 'heavy' for it.
the turn the amp gain all the way down, turn the head unit up until you hear the normal sprakers start to distort (that f@rty worbbly muddy sound), then turn the volume back until it goes away and the full fidelity (faithfulness to the input signal) returns. Then turn the amp gain up until the subs distort, and back a touch until they stop. Turn the system back down at the head unit. Your system is now balanced to the maximum volume it can reproduce, adjust to taste from there. And remember to thump responsibly.
So it will take 2 ohm speaker loads, therefore you can parallel 2 speakers together, that is to say connect 2 speakers to the + and - terminals of the left channel and 2 to the right.
4 ohms paralleled with 4 ohms = 2 ohms
So you are OK
Take the peak to peak power rating and multiply it by .727
that should be the RMS watts.
You don't have to worry too much about new stuff, but if you are using an older stereo amplifier that is rated for 8 ohm speakers then you should not use 4 ohm or they will pop the finals in the amp.
You could use 2X 4 ohm speakers in series on every channel and it should be ok.
The radio code is a security feature that's meant to deter theft, and it's unique to each vehicle. If you've lost your code, you'll need to contact a Nissan dealership or service center and provide proof of ownership. They should be able to help you retrieve the code. Please do not attempt to use codes from the internet as incorrect attempts may lock your radio.
Unfortunately, no one knows or is telling. Companies rarely state power in RMS because Peak Power is a much more impressive. 1000 watt amp, 200 watts RMS x 2 channels at 8 ohms. Look for a sticker on the unit.
https://www.google.com/search?q=Xplore+Amp+5553
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'year make model' of the vehicle is needed in questions like this please?
Modern vehicle radios are controlled by the Body control Module (BCM) and are used for broadcasting warning beeps and indicator clickers. The beeps an be as innocuous as "do you know your radio is still on"? It can also be caused by your cellphone pinging local transmitters and receiving a confirmation back, or checking in for emails.
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