I was thinking of getting one of these but I'm not sure EXACTLY how it works. Will my amps run at 1ohm and then the one signal coming out be a 1ohm load still, or would it become a 2 or 4ohm load? I'm sure it has to be matching amps, but what load would they have to do power in for me to get power at a 1ohm load? What are the drawbacks of these?