Very good speaker for low watt amps. If you own an amp 1-2 watt, look no further. It is a mistake to use low watt amps with big speakers, because they don't give a good response.
I own two small tube amps, a Vox Lil Night Train 2 watt and a Palmer Eins 1 watt. First I tried a 12 inch Celestion Greenback 25 watt with them, but I didn't like the sound, because it didn't have good response.
Now I am happy with Celestion Eight.
I think the Greenbacks does well with amps up to 5 watts.