I have used my DT50 112 and DT25 head a lot of different ways....Yes, these days I very much like running the DT50 Class A and the DT25 Class AB...But I generally only use that setup for shows...I rehearse with the DT25 quite often and it works quite well...I never use it with the stock cab in a rehearsal...I have a 4 ohm 212 sealed cab that works great with it...I also have an 8 ohm 212 sealed cab...the DT25 works much better with the 4 ohm cab...Too cranked with the 8 ohm cab as the power is reduced a bit with that load...On the 4 ohm cab the DT25 works a lot better, but the DT50 kills it for the Fenderish cleans...The DT25 simply isn't enough power to get those dynamics...Even the DT50 is under powered to render a true to life twin, but it's close enough...

taking full advantage of the power section...Not sure how to answer that one...But I tend to take a slightly different approach for live vs recording situations...I am not into using an attenuator...While it can really help get the master up and help with getting a most awesome crunch, lead, dirt or what ever it is where you are want that tone that is pushing the crap out of the power section I find that it compromises clean tones...I don't want my Fenderish clean attenuated...I want the spank to jump out of the speaker box and grab me around the neck...

I find that most of the time I end up running the DT50 around 10 o'clock...When I use my DT50 112 alone, I use it with my 212 sealed 8 ohm cabinet...My DT50 is loaded with a 16 ohm Jenson Jet Tornado...the combined load is 5.3 ohms and I run that on the 4 ohm tap...This is actually a very slight attenuation as the speakers I am using have an SPL rating that is slightly lower than the stock speakers...1.3 ohms higher on the load takes tiny amount off also...My channel volumes vary from 10oclock to full...depends on the model...Using a 16 ohm speaker when I take the DT50 alone to rehearsal I can crank the master a bit more than with the stock GH90 8 ohms speaker...higher load means just about - 3db on output, so I am attenuating the amp...just doing it by selecting the speakers that match what I want...sorta like selecting pickups...It's a personal preference...

recording I definitely work with the channel master relationship...anyway, I have not found a need to add load resistors to my chain...I am not into that...I would rather use lower SPL speakers and move it in the right direction...

there is something to that GH90/V30 combination...I loaded one of my 212s that way...It's a cool vibe...But I am not the right person to ask about Celestions...I can't stand them for myself...Jenson Jet Tornado is my speaker of choice these days...

The DT50 112 is a heavy amp...I think the 212 is pushing 80 lbs...I am a 112 combo with a 212 sealed cab underneath kinda guy....I run my SVs that way and my DT50 that way...So I would tell you to get a 112 and add a cab if you need it...But then what works for me might now be right for you...I can just tell you what I like...