Today I got one RCF NX-12SMA. Spent the whole day tweaking and testing, also doing a new, more thorough profile of my amp and then I did the toughest test:
GUITAR
> LEHLE SWITCHER
>> KPA+RCF NX-12SMA
>> just my amp (FENDER EC VIBROCHAMP)
Now, seven hours later, I am just tired...
What I can say so far:
- Especially those parameters in the amp section (sag, bias, definition) and cabinet section (high-shift, low-shift, character) need still a lot of time to get used to. Some of them might be subtle each on its own but in total they can bring you far away from where you started ... whether this is good or bad depends on your luck or on your knowledge of the KPA.
- I can only agree with what has been said before here: trash in > trash out. Your profile has to bee pristine! And this really is a difficult process, an art, just like recording an amp is anyway. Also for me there are a lot of unanswered questions on what the KPA does during profiling - it is more than just "recording". After all it is much more recomendable to avoid problems (by using a good profile) instead of solving them (by tweaking the parameters later on).
- It is way much easier to do this "amp standing there in a room right before me" feeling with the KPA plugged into a clean amp. A KPA+FRFR setup sounds more like a well (or badly) miked amp in the monitors of a control room. This is nice too, but it is not the same. Not even whith an expensive speaker.
- Especially on the high end sparcle of guitaramps with alnico speakers the balance between muddy and shrill is very fine line in a KPA+FRFR setup. Just a little bit too much makes it sound metallic and harsh compared to the Champ alone.
- This whole process is very subtle and fragile ... and psychological, psychoacustical and whatever ... certainly exhausting! But that is all too logical: many parameters to change offer many possibilities to get lost. It just needs more time than just picking up a Champ, plugging in and enjoying. Time will tell...
Ok, so much about my toughest test today. But the RCF NX-12SMA really seems to be a good speaker! Not much hizz, even response when you walk around it. And it still sounds quite nice when you look directly into its face - no harsh yelling.
It's just that they are a bit big and ... pricey.