i was looking at the bogner site and it said that when you switch the power to half mode on uberschalls and bogner amps you change the output ohms to half too. now i read the jcm900 manual and it doesnt say anything about doing this. now my question is im running a 16 ohm cab with my jcm 4100 on 50watts outta 100 on 16 ohm mode should i actualy be using an 8 ohm cab? or does this not apply to this amp design?