Didn't find the xmax of these subs in these thread, could anyone provide?

1500fe http://www.audioheritage.org/vbullet...p?33566-1500fe
2216Nd http://www.audioheritage.org/vbullet...p?33565-2216Nd
1501al http://www.audioheritage.org/vbullet...p?33564-1501al
1501al-2 http://www.audioheritage.org/vbullet...33557-1501al-2
1501al-1 http://www.audioheritage.org/vbullet...33556-1501al-1
1501fe http://www.audioheritage.org/vbullet...p?33555-1501fe