It could be if the rest of the design was done correctly. We don't typically design 15" drivers for 1K crossover points..... we focus on 1st/2nd octave performance where they are designed to operate. You will be into cone break-up in any 15" driver once you get up that high and you have all the obvious dispersion characteristics of a 15" diameter driver. On an open baffle it is wider than in monopole use but you still have the cone break-up to consider.
All of those are system design constraints that any 15" driver will have. You don't exactly get a pretty response that high so you may need to plan for notch filters or other crossover work to deal with the response anomalies which you would need to measure in the design to determine the appropriate network needed. If it were me.... I'd aim for a lower crossover point where you don't have to worry about the break-up of the 15" driver and the dispersion pattern better matches what you are matching above it.
