Hi @rauliruegas
Couple of things. I meant that I would expect a 6.5" woofer to have a -3 dB point around 40 Hz. That doesn't mean that there is no output below that. In fact, upon reflection I realized that when I made these speakers I cheated in a couple of ways. I already had bass traps, and I always intended these speakers to be used near the rear wall, so I designed the crossover accordingly. This flies in the face of "best practices" for speakers which is to make speakers that are measured as if in an echo-free world. My measurements and test location were HUGE cheats and I'm sure the good Dr. Joe D'Appolito would be very unhappy with me.
What I mean by subwoofers being tone controls is that there is by merely introducing a subwoofer we are altering the tonal balance of our system, and that the end result must be set by personal preferences. There is no such thing as an objectively neutral subwoofer installation.

