Their subs are 4 Ohms and have a 150Hz high passed output for an 8 Ohm main. Thus as far as running the amp bridge mono, the PV 1500 they have is only rated for an 8 Ohm load in bridge mono mode, so running it with a 4 Ohm load, much less a 2 Ohm load as they would be doing, is probably not a good idea. And because the mixer apparently does not have an EQ Out/Amp In processing loop like some powered mixers do in order to allow you to insert a signal to the internal amplifiers, using an active crossover would apparently require a second amplifier that they do not have.
As it happens, both the PV 1500 and the EMX512SC are rated at 500W per channel into a 4 Ohm load. Thus the simplest setup would be to not even use the amp and come out of the EMX512SC amp outputs and into the "Full Range Input - 4 Ohms" subwoofer inputs. Then out of the "High Out - 8 Ohms" outputs on the subwoofer and to the Club S115V mains.
The next simplest alternative would be to come out of the line level "Main Outs" on the EMX512SC and into the PV 1500 amplifier inputs. Then from the amp outputs to the subwoofer full range inputs and on to the mains as above. Run the amplifier in stereo mode and engage the "Low Cut" filters but not the X-Over.
That is how you could use the subs with what you have. However, as I mentioned before, the drawback to this is that you have no way of adjusting the relative level of the mains and subs. Your mains are rated at 99db at 1W/1m and your subs at 98dB at 1W/1m so they actually match relatively well if you wanted equal level from both, but if you wanted to turn up the subs relative to the mains then you have no way to do that.
You could look at options such as using the Main Outs on the mixer to the amplifier to drive the subs and using the mixer amp outputs to drive the mains. That would give you control over the relative sub-to-main balance and maybe a bit more overall output, but it is also a bit more complex setup and has the mains run full range.
If you're willing to invest in the system then the next step would probably be to get a crossover/processor and a second amplifier. That would allow for greater flexibility and better performance.