| Re: Help me pick a fun/easy DIY sub project
No driver you buy in this price range will have enough displacement to warrant a tune below 20hz, so focus on >20hz.
A cylindrical port is better than a slot port in minimizing turbulent air flow, so unless you've already built in a slot port, you should seriously reconsider cardboard tube. A 12" driver typically warrants a 4" diameter port.
Not sure what the price difference is on those plate amps you are considering, but if it is marginal, go for the beefiest one.
Lastly, temper your expectations on performance with a $300 subwoofer - whether it be DIY or commercial.
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