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Just carrying on with the audio tinkering.

I have a new REL T Zero to provide some low end support for my DIY Helium Micro Monitors. I set the system up with REW and can definitely hear the improvement in sound reproduction (bass) but wanted to tinker with a simple DIY passive high pass filter between the preamp and integrated amp (or integrated amp and speaker), that I recently built. The REL currently takes a parallel signal from the speaker terminals in the integrated amp and it has its own crossover controls (perhaps this can be changed to the preamp outs, before any filter).

My intent would be to see if the Dayton ND91-4 would benefit from removal of some of the work at around <50Hz or so. I have seen single capacitors used in this type of application with claims of improved sound. Is it worth trying? The data for my REL integration testing is attached with some brief explanation included. These are in room measurements with mic at listening position.