It is okay to run at 4 ohms into an 8 ohm load and vice versa, as long as it is not more than double the load (4 into 16 is 4 times and probably not safe for long/at volume) then it is perfectly fine even for the long haul. Companies like Mesa and Hughes & Kettner will put it into writing for...
Yeah it is basically just for different channels so you can hit the switch and have the other channel dialed in differently for more or less gain/volume. So your example would be great to have the volume set higher on one to really punch in for solo work.
I think the Ritchie Blackmore sounds great at low volume, plenty of eq to dial in whatever sound you want. However, you would probably want to adjust it real quick as the volume goes up. Out of the other 3 you mentioned the Bogner is probably alright at low volumes, but the others like a...
Pretty sure Fantom is right here. It is loaded with 16 ohm speakers, in mono it is @ 8ohms, if you use the "thru right" input jack you need to go into another 8ohm cabinet into 4ohm input on head (but 8ohm input on the head is technically safe as well).
Does the volume on the savage have like a ridiculously good and useable sweep to it? I just got a V2 Blackmore and it has the most controlled volume of any head I've ever seen. Smooth gradual increase until about 8 on the dial *3 or 4 oclcok before all hell starts to break loose. I know it is...