For those who have doubts or just refuse to even consider this, how intelligent is that, I have a couple of ideas you can easily apply (in certain cases) to visualize your speaker's output. The first and easiest way is by using an APP for cell phones called ‘Decibel X’ or just ‘DB’. It is a free tool that you can use just like a frequency analyzer. Yes, it will depend on the microphone of your phone, but that can easily be remedied by using a better microphone. It takes some time to learn how to see the rapidly changing frequency charts but it works well.
The second means of testing is IF you have a system that is tuned by 'Dirac' (Diraclive and DiracLE). This tool lets you RECORD the output of a specifically tuned sound that scans a multitude of frequencies and then provides you with a printout of the response. This uses THEIR microphone, which can also be used in the previously mentioned test with ‘Decibel X’. It will not tell you what is musically pleasant to hear, but it will provide you with an accurately tested and documented report. And I think that anyone who has utilized Dirac will tell you, that it does wonders on 'Room Corrections'.
Ok @esarhaddon - do you have the before and after graphs of the cable riser from ^that^ DIRAC report?