I must report, that i was not totally fair with the EF5. It turns out my interconnects had some kind of short and it was injecting some noise into the amp. I hadent realized or even suspected the interconnects. So my previous comparisons are pretty well invalid at this point. I have to start over... Still, the O2 is incredible for the money!
Im thinking about getting some Orthoydynamic's in the near future, so im not so sure im in that much of a hurry to get rid of EF5. It does, afterall have way more gain then O2(almost twice as much). Might come in handy with HE-5.
Edited by MikeW - 2/12/12 at 3:33pm