Re: For thickness - semi open or closed?
Thanks again Archer! You know, I like variety and the G12K-100s sound magnificent in my Stone Age 212, very versatile, big and clean! Since these speakers have a lot of natural lows and sound so big, I think having a 4" slot opening in the back works fine. That is my Stone Age 212.
My Bogner 212 has V30s and I keep that closed.
I also have a Splawn 412 and plan to buy another THD 212 woon so I should have enough to provide a lot of variety in speakers and cabs.
Thanks again for the input.