More mids = G12H into Marshall 1936?

[Thelastninja]

Hello.

I have a Marshall 1936 2*12 closed back cab equipped with 2 GT12-75. I want more mids, so I have an idea about exchanging the GT12-75s to G12H anniversary edition speakers. I'm hoping that the cab won't sound as scooped as it does now.

I also wonder if the closed cab construction itself contributes to the scooped mids, compared to an open back construction.