This is Celestions own guidelines to their speaker models. Not much good info in it, but yours would be under the category "60's rock":
As to what each is best for, here's a rough guide:
Blues - G12M for warm and laid back sweet and smoky, Vintage 30 for more aggressive, modern blues
60's rock - G12M, V12-80, Vintage 30
70's rock - V12-80, Vintage 30
80's rock - G12T-75, Classic Lead 80, Vintage 30
90's high gain shred - Classic Lead 80, Vintage 30
Warm, rounded jazz - V12-80
Clean - G12T-75, Classic Lead
Metal - G12T-75, Vintage 30, Classic Lead, V12-80
Industrial / death metal etc - G12T-75
Good all rounders - G12T-75, V12-80, Classic Lead, Vintage 30.
I hope this gives you some ideas, but remember that the best sounds often come from those who use things differently to conventional wisdom, creating new sounds and styles. Our website has further guidelines on cabinet design.
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Everyone seems to like the Greenbacks, the V30 or the G12-65.
Most folks are 70 and 75 haters.
80s have a few more fans. Seems like Bill Z Bub or Cleveland Metal liked them.
I have to admit My G12M70s seem to be a little harsh sounding to me right now, but they seemed fine when I has just "jamming" in the Garage/Living room with a bassist, guitar player, and drummer. I'd like to try the 65s - supposed to be like greenbacks with more power handling.
I have a set of the 70 watt Celestions in my Laney cabinet, I think they sound pretty good and it is a very "metal" sounding cabinet-real tight lows, good amount of highs without being brittle and kind of less mids. Cool speakers.
They refer to the G12M- 70 as "MODERN LEAD 70W (available in 16 Ohm) Greatest when pumping out hard rock or metal, this modern lead speaker is the standard replacement in all 4x12 Marshall amplifiers."
It may be the open back combo that loses some of the low end for me?
Yes it is. A closed, well proper designed cabinet will definitely go lower.
A feature with a small baffle, open back system is that low frequencies will go out the back and find its way to the front, hitting the front of the speaker, often with signals in reverse phase and "nulls" out the movement of the speaker. Thuss less low frequency output.