I can’t comment on your specific system but adding a super tweeter is not as simple as you might think. To do it right, you will need to make sure the super tweeter has similar or very close sensitivity; dB/1m/1w, so the volume matches the panel’s output. You may also need to build a simple crossover network so the frequencies don’t interfere. I tried adding a super tweeter to my single driver full range back-horn loaded speakers but I had hell of a time finding the right brand/model and getting them to blend well.
I hope more experienced speaker builders will chime in with better guidance.
I hope more experienced speaker builders will chime in with better guidance.