So...when you say your target looks good, you didn't mention your opinion on how far down you would recommend to go with the bass before I complete the target. I'm really interested in people's experiences with that.
It is always good to inspect the actual correction filters themselves (i.e. chart view details: correction) to see if:
a) you are getting any narrow band artefacts in the frequency response, and if yes, then reduce the amount FDW cycles in the TTD sub window unitl it goes away.
b) with the frequency scale showing down to 1 Hz, where is the correction frequency response reaching 0 dBFS (actually Bernt limits to -1 dBFS to prevent any overs). What you are looking for is there any unnecessary "boosting" at the frequency extremes that is causing unnecessary filter attenuation. Typically seen at the frequency extremes.
So for both frequency extremes it is good practice for the target to follow the natural rolloff of both the bass and treble of your loudspeakers. There are some caveats, e.g. ones speakers can go lower and have the power (i.e. watts) to extend the response. Or you are using constant directivity waveguides and the room correction is also providing the necessary constant directivity HF eq boost.
Specifically to answer your question, I often go down to -60 dB or even lower below 10 Hz and straight line to the left to 1 Hz. There is no good reason to pass any significant signal below 10 Hz in the correction filter.
Another pro tip, once you have determined your target preference and CPD settings, a fine tuning step most people miss is to keep reducing the amount of max correction in the CPD down to like 3 dB or even 1 dB max. There is a sweetspot there that one can "bracket" and compare filters. It's a tradeoff between smooth frequency response and how dynamic the music it sounds.
Have fun and experiment!
