Well it's fair to say I haven't played one. But for you know what's and giggles, I just plugged my bass into my studio setup and put an 18dB filter at 68hz to simulate the effect of that cab. Obviously the E string doesn't just disappear. But you know what sounded a LOT better than playing with an 18dB filter at 68hz? Playing the same lines after turning the EQ filter off.
Your rig has a rolloff in the low frequencies - all bass guitar cabinets do at some point. Adding another rolloff will change the sound, but you certain can't think that the cabinet you have is perfect, and that the filter you added perfectly replicates what the Ampeg cabinet would do. If you started with the Ampeg cabinet, and added the filter that your cabinet has, you'd likely come to the conclusion that your rig sounds like manure as well.
What you did in no way replicates what the Ampeg cabinet does - there are too many things you just don't understand about the situation to make the definitive statement you did.
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