Re: What are the differences between Greenbacks and G12H30's??
I think the Greenback sounds best in a sealed 4 x 12 cabinet...like a Marshall cab. In an open back cab it lacks bass. It's a very chunky sound speaker with alot of the honky, chunky, slightly distorted midrange that's cool for a certain kind of crunchy Marshall tone.
The G12H30 has more bass and clearer bass and a more balanced and versatile tone, IMO. Sounds great in Fenders or Marshalls. I use them in my Deluxe Reverb amps.
I'm not a huge fan of the Greenback now that we have other choices...like the Vintage 30 and G12H30. I like both of those more than the G12M Greenback.
The Greenback is still a great speaker though, and IMO, usually better than most 12's that might come stock in most amps.
Lew