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Sorry for the delay, it’s been crazy here with work and then yesterday a nasty storm came through that took out our electric and cell service. Yeah, it was bad.
‘Nough of that.
Going with 4 ohms on your drivers, and the general specs on most amps that aren’t specifically designed for automotive use, I’d say wire them in series to make them 8 ohms equivalent. If you were to wire them in parallel, they’d be 2 ohms equivalent, which could be too low for the amp.
This link does a rather good and thorough job of explaining the wiring of multiple drivers.
In essence, if you look at your 2nd pic, use the top 2 for wiring. Amp + to 1st speaker +, then 1st speaker – to 2nd speaker +, then 2nd speaker – to amp -. That will be double both the driver ohm rating and power rating. That’s the easy explanation. Reading that link above shows it can get a lot more complicated the further you go into multiple driver setups. For now, that would be the safest route for you to go.
Reply To: RE: Attempting to reuse old Bose Subwoofer for my first speaker build.