MA PRD 500.1, How did I do?

[joeshmo 10+ year member]

So I recently bought a memphis audio PRD 500.1 amp off this guy at a garage sale for ~10$. I hooked it up and played with it for a minute, seems to work pretty well. It only amplified things below ~300hz, I'm not sure if that is normal or not. The rest of the frequencies were simply not present.

So assuming this is a working amp, how did I do pricewise?

Also, why in the world does it have an RCA output? Do they make subwoofers with RCA inputs?

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