

Yeah, when I saw the manual had a recommended setting for "Metal", I was like..."Hmmm"... :fing2:
The Fullback is a killer speaker. I would expect a ton of clean headroom in that amp. You are going to be very happy with it. Here is a review I wrote on mine.
http://www.tmrzoo.com/2016/69493/gear-review-celestion-g15v-100-fullback-15-inch-guitar-speaker
I got a Delta Blues 210 a month or so ago and I love it.
Finally dropped it off for the JJ Tubes "Blues Re-Tube" - premium matched quad of JJ EL84's in a hotter grade for power along with a standard ECC83S for V1, an ECC832 for V2 which drops the gain and makes the drive channel sound more open and natural, and a graded high current ECC83S for V3 with biasing and swapping in a Celestion Fullback 15" Speaker.