Ok, I am a bit new at the bass playing thing. Only been playing bass for a couple of years. So I went out and got an Ampeg 410 Classic used. I have, or am having, a few issues with it. I have searced the web and these forums best I could to find some info, but posting a thread seems to be the quickest way... The cab has 4 10" eminence speakers in them. Seriel number is: 10401A and they are 4ohms. Are these stock Ampeg speakers that usually come in these cabs? Also, on another thread I read that someone elses Classic 410 is sealed...well mine has 3 ports in the bottom of it. About 2 or 2.5" diameter. Is this normal? The reason I am curious is because the guy I got it from works on amps, cabs and guitars...and I was told he may have modded this cab. It still has the tweeter in it...and it is physically hooked up...but I cant seem to hear it or get any difference from sound when I turn the knob on the back. So, in conclusion: Do I have a true Ampeg Classic cab? Or one that has been tampered with? It seems that it is wired in series? Is this correct? For 4 4ohm speakers seems like it would have to be. Any info, helpful advice or solutions is more than welcomed. Atm, I cant stand the sound I am getting from this cab. It sounds nothing like the ones in stores or anyone elses rigs. So I would like to fix it if it is a cheaper solution than getting an entirely new cab. Thanks for anyones help.