Newbie suggestions

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Hello,

I need to create an active circuit for a course at my high school for my summative project. If you guys have any suggestions for what I could build and links to the project it would be appreciated very much.

My ideas are these:
sub-amp...probably too costly
Baffle step compensation
Adjustable EQ (ie. adjust 200Hz. +-12db. not peak but, a gradual climb in response)
Pre-amp.

TIA
 
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