Please search the forums. Every question you have asked has been exhausted in the forums. Once you put in the time you will have all information necessary to finish your system.
The stock head unit powers all 5 channels including the stock subwoofer (there is no external amplifier. Every experience in this forum will indicate to you that there is no external amplifier that you can provide signal to from an aftermarket head unit. The "B" harness that you are describing does contain + (WHT/GRN) and - (BLK/WHT) for the sub...they run directly to the sub as speaker leads (not through an external AMP). All other connections in that harness are for the Active Noise Control Unit (ANC). Some people have mistaken this for an amplifier but it is not.
Since you replaced the head unit you must now purchase a separate sub amplifier and you must replace the stock sub (of course you can decide to power the stock Alpine paper weight that Honda provided but it will sound lousy. I am sorry but there is NO way around it.
Good Luck.
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