T75s arent as bright as V30s, and swamp thangs are pretty dull imo.
Both speakers are quite scooped, the 75s more so. 75s and V30s blend well together in the room, they smooth each other out. Both are also quite a lot bassier than V30s.
The best speakers for 5150s are mesa V30s imo. Very different speaker. This is a test of my 6505+ through my mesa recto standard and then ubercab: both are ostensibly V30s (2 V30s in the uber, 2 75s, I miced a V30).
https://soundcloud.com/mdv/mesa-rectocab-vs-boger-ubercab
I'll give this a listen when the rest of the people in the house aren't asleep ... it's nearly 2am here. I tend to think that the 5150/6065 & 5150 II/6505+ are very different in the mid-range from my 6534+, and that perhaps I have suffered somewhat from taking recommendations for the 6505+ too uncritically. My amp seems to have a LOT more mid-range cut on the same settings through the same cab as my friend's 5150 II. To be honest I had trouble hearing his leads against the other guitarist (Krankenstein through Rev 1 cab) but when he switched to my amp the leads suddenly stood out. This was in a practice room with no pedals (all he had plugged into it was the footswitch) and no mixing. I was blown away by how much midrange cut it had with the mid control severely scooped. I think this indicates that the EQ - taken from the 6505+ - reacts very differently with the 6534+. Some people have said that the EQ is really low, low mid, and high mid, with the presence control affecting the highs. This might be why he was getting so many upper mids on the same setting as his 6505+.
I thought the Bogner Uberkab has a V30/T75 x-pattern? I'm seriously considering pulling out two of my V30s and installing T75s in those slots. I find that the V30s tend to overemphasize the already strong upper mids of the 6534+ - the T75s should add in more lows and highs, while the two remaining V30s will still give me those mids.
I'm still interested in the V30/CL80 mix in a 412 though.
In this comparison I preferred the CL80s to the V30s by a considerable margin.
Marshall AFD100 - Celestion Classic Lead 80s vs Vintage 30 speakersIt's interesting because in some other clips - I think done with a modeller - I consistently preferred the V30
The 'added highs' of the T75s worry me - I feel that I have more than enough highs with the V30s