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You don't need much.
It's just a 4" full range driver and 2 connectors and bit of wire. Because it's full range, there are no crossovers to worry about and the amp is separate - these are just passive speakers.
Some example parts on this instructable...
https://www.instructables.com/id/3D-Printed-Nautilus-Speakers/?utm_source=newsletter&utm_medium=email