Hi all, since I've gotten my Zilla 2x12 Fatboy Pro I was in two minds about it. This has a Celestion V30 and K100. I had read that this combination gives the perfect blend of midrange and low end thump. I've only played either T75's or V30's and was curious about the above combo. At that point of time I had two amps and thought to have a cab for each. I have an ENGL Pro 2x12 with V30's that sounds tigh and focused and I was thinking of getting something with a different sound and maybe a bit more thump to it. When I got the Zilla I was immediately in love with the bigger sound and increased bass response and even contemplated selling the ENGL. I wanted though the honey moon period to pass and see objectively if the Zilla was superior to the ENGL, as I initially thought. After a while I kind of saw that there was a weird midrange and felt the Zilla could not cope with darker amps as it made them sound a bit muddy. Plus all my amps sounded great on the ENGL but nnot so much on the Zilla. I thought about swapping a V30 from the ENGL to the Zilla and see how the Zilla sounds with 2 V30's and the ENGL with a V30 and a K100 but the Zilla has two 8ohm speakers and the ENGL has 2 16 Ohm speakers. I saw the construction of the ENGL cab and it seemed superior to the Zilla, plus the ENGL cab seems aimed to be quite directional (front loaded speakers and padding on the sides) while the Zilla seemed more of fill the room with sound cab. I then checked by shifting from side to side while playing to see which speaker was giving that undefined sound and weird midrange and it turns out it's the V30! So I finally found a K100 in a good used price and got it! The speakers where soldered on the Zilla and I initially tried to unsolder them as to not cut the wires (they were quite neat and tight in length). But the soldering was so tight and good (wire looped around the contact) that while I managed to get one wire out, I opted to cut the other wire as I faced the danger of damaging the V30. I put in the K100, soldered it and put everything back in place and hooked it up and the annoying midrange has disspeared lol! In first instance it felt a bit dull but playing around with it a bit more and adjusting the amp settings slightly I got it to were I like it. Definetely a smoother sound but so much tighter and deeper! It seems the cab plays an important role with the speaker a lot more than I thought. Also while the Zilla is a well made cab I'm not sure how much the Zilla guys have tested speakers with their designs. The ENGL seems a lot more engineered and thought out because even if it has V30 speakers I'm not getting the annoying midrange I was getting from the Zilla. The Zilla is more modular but the ENGL is more engineered. Plus the ENGL has thicker wood than the ENGL and is quite heavier lol! On another note I put the V30 in my Marshall 8080 combo replacing the T75 Celestion aaaaaaand I'm taking the V30 out as soon as possible. Like I put a can of bee's in the amp. Just yuck! TL;DR: I replaced the V30 in my Zilla cab for another K100 and it improved the sound dramatically!