01 Honda Prelude engine knocking, have audio clip?

This started about a week ago and it really has me worried. I had my oil changed today but it still makes the knock so that's something that could be crossed off the list. I would really appreciate any help in identifying the problem because i'm at a loss. I would have revved the engine but i'm to scared, but when the rpm's do climb the knocking noise just gets faster with it. It is an automatic base trim if that helps any, thank you for the help in advance.

Sorry to say IMHO you more than likely have a very serious problem. The sound I hear is a severe knock. This is normally caused by severe wear to the rod or crankshaft bearing. Time to have a professional listen to this. You are more than likely going to need a complete engine overhaul. But until you have a professional diagnose the problem you will not know for sure. There are other things that can cause this sound.