Well, where to start, hmmmm...... IMO
A 1 x 18" cab will sound horrible (especially Carvin) without at least a 8" or 10" somewhere in the mix. 12" are the largest I go on a 4 string, and I may use a 15" with a 5 string. To be honest with you all you need is a well designed ported 2 x 10" cab. 18" is too much, there is almost no deffinition in the audible energy wave untill about 20 ft away from the cone (try it). Try a well designed 2 x 10" you will be pleasently suprised.
