Invader - a pair in a closed back - or better semiopen?
Will it be warmer than the Celestion Greeny tone?
Not really, they are prety much on-par with a pair of green-backs, tone-wise. The big diference is that they will not begin to compress and distort early like the 25-watt GB's do. I personally find the Invaders work just as well open, closed, or semi-open.
Retro and ET 65 in a mix, this is often recommend for the best mix in a closed cab, but I still like more 2 of the ETs in that cab, bacause the Retro sounds sometimes a little bit too trebly against the ET 65 which is better in overdriven tone. ????
Yes, the Ret has a lot of top end ... I now prefer the ET-90/Ret 30 mix ... because the ET-90 slightly over-powers the Ret30 and becomes the more dominant voice ... whearas the Ret 30 could slightly overpower the ET-65.
Veteran, the Vintage 30 competitor??? Alone or in a mix with the ET65??? What type of cab then - closed or semiopen???
If you find the Ret 30 a bit too bright, you might prefer the Vintage 30 ... almost the same sound, but with a little less sparkle and a bit less low-bottom. Open/closed ... Could go either way. I prefer open, myself.
At least is the Invader a more open focus soundkeeper and warmer with less high peaks than a Green Beret or Greenback????
Vaughn, you've got me thinking about yanking out the Vet30 in my SS22 (used with a Retro 30 in a closed back cab) and replacing it with the ET90. From your SS22 demo the 90 sounds nice and spanky and the combination of the two seems like it would be a winner.