I'm using a Fuchs Blackjack 21 and my other cabinets are loaded with WGS Speakers. So I have a full size 1x12 with an ET65 in it, a closed back 2x12 Feiten Fuch Cabinet that I loaded up with a pair of Reapers. Now I have this Fuch MINI 1x12 that with its current Eminience RWB sounds like a box with a speaker in it. I want to get a big sound with a wide spectrum. I'm playing blues, rock, what ever strikes me.
Sadly ... the sound you describe is typical in a too-small cab.
Nothing is going to make it sound like a properly sized box ... but the ET65 will get you the closest.
Well I have two ET-65 here so i'll give it a whirl.
Since I have two here i'll give it a whirl!