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What would be the difference in tone between four Retro 30's in a 4x12  and two  ET65's and two  Retro 30's in an X pattern?  

These will be going into an old Peavey cab that seems a little bassy no matter what speaker I put in, so a brighter speaker does help.  Also, I have two Retro 30's.  

I had Vet30/ET-65 in X pattern. I play low volumes. It sounded waay too topsy-turvy to my likes. I was really unhappy until I put ET-65s on top.

 

Now it blends for a perfect tone. It's not one speaker fighting against the other, either. It's ONE BIG FULL FAT SOUND.

 

But that's just me. It was my first.