Apologies I've caused some confusion here!
I had Goldenboy over yesterday to have a listen to my setup and to work on his new tune. Personally I don't think Res 2s can be beaten in terms of dynamics. Their efficiency means they can reproduce transients beautifully with the drivers never sounding stressed. Also, unlike a lot of other PA companies F1 are pretty purist about designing cabinets that don't need much or anything in the way of EQ. I think this is a pretty big factor in their sound as EQ to tends to inducing phasing which smears transients.
Anyway, Golden's tune came over great. We did both agree that the cabs, as I have them set up are a bit bass light. When I say bass light, I'm not talkin about an absence of bass, just not trouser flapping low note reproduction.
This isn't an issue with the F1 R2s per say, particularly as they're often just run as mid/tops (as in my setup) but to do with the complexities of horn loaded bass bins. Essentially horns are super efficient, often giving twice the SPL per watt of reflex bins. However they come with a drawback, which is that they have a very steep roll off beyond a frequency defined by the length of the horn, unlike reflex bins which roll off more gradually. This can be countered by either having bloody great horns, or lots and lots of them. ImageShack® - Online Photo and Video Hosting
SPL aside, it's often said that F1 horn subs tend not to sound that amazing when you've only got 3 or so per side compared to other subs. They shine better in big stacks (which is unsurprising because big events are more F1's market anyway).
As for my setup, I've got a pair of TCS-215 (turbosound) dual 15 inch bass bins, which are 'ok'. They're technically a great sounding cabinet, but they don't exactly leave a brown stain on your underpants playing sines at 40hz. Pleasing and accurate I would say. I've got some custom built horn loaded subs designed for the task which should be arriving any day now.
Reptil - it's very difficult to underpower F1 in this kind of setting, because it's all so damned efficient. 100 watts of power would be enough. In the PA world amplifier power matters far less than speaker efficiency. To increase SPL by 10db requires 10x the amplifier power! Basically you can't make an inefficient speaker loud by giving it more juice, it will just melt at the voltages required. With PA we tend to give each driver 2x more RMS watts from the amp than its RMS limit to prevent such a situation. Under powering is considered pretty much as dangerous for your drivers as overpowering - I've experienced first hand the nasties of driving amps too hand. A few months back some ****** DJ decided it would be sensible to turn everything up the max on the mixer... the amp produced DC current, melting a crossover inside a full range cab and blowing a compression driver... leaving the circuit fully open on that channel causing the amp to overheat and fail and take out the other stacks. Fortunately that was at the end of the night, and was not on my res2s.
To the op - I think Res 2s are excellent for mixing. But you definitely want a pair of mushy as **** floorstanders or the like for the opposite end of the spectrum!