Just a quick update:

I picked up a speaker cable and now the cabinet sounds fine.
Luckily, it wasn't an expensive lesson! 

Thanks again for the help!

I used a guitar cable to connect the amp to the cab, which I now know was a monumentally stupid move.   :grr

I guess my next step would be to get a speaker cable and find out how much damage I caused to the speaker cabinet...

I'm not sure how the cabinet is wired. I will have to check to see if it is wired series/parallel or not. How should I go about testing the speakers to see if they are blown? Also, would there be a transformer in the speaker cabinet or only in the amp?

Thanks again for the help thus far, I greatly appreciate it-

Sorry, I mean it sounds the same with both amps- fuzzy and muted.

I guess that means I blew out something in the cab right?

I tried the amp through a Peavey 4X12 cab (4 peavey speakers rated 50W@16 ohms) and it sounded fine.

Tried the cab with a Crate B160XL and the cab sounds the same-

Hello all-

I am a total beginner and have a quick question

I recently picked up an old Peavey standard head (130W@4 ohms) and today I bought a 4X10 cabinet with 4 carvin ps10 speakers (200W@8 ohms).

Everything sounded fine at 1/4 volume until I played a high note. Now the cab sounds really fuzzy and muted- What did I do wrong?

Thanks in advance for any/all replies!