Most 1x12 combo amps seem to cost about as much as their equivalent heads. Is there any downside to running a combo into a 4x12 cab rather than running a traditional head/cab? What I'm thinking is that I can buy a combo to use for rehearsals and then for gigs - if I choose - I can hook up the combo to my 4x12 cab - sweet! Would this essentially be the same as running a head and cab? Just trying to determine if this is safe to do! Thanks!