Good Afternoon everybody 😁. So am going to build a box for a friend of mine. So around the cut off frequency from the manufacturer of this driver is 60 HZ. The box design program said It’s minis .9 DB at 60 HZ. That’s the program’s recommendation of the driver in this box. I reworked the numbers and got 0 DB at 60 hz but, the box went from 2.1 liters to 4.3 liters. Everything else stayed the same. Now at 47 Hz it went up to 1.5 DB and then back down to the 0 and then into the minis of DB’s after 45 Hz. So The box is front ported with Normal stuffing. A square box nothing fancy. The question is? Is it okay to have it at zero DB on the drivers manufacturer’s cut off frequency? Or will it cause more damage to it? I was told by a engineer years ago to match the Hz with the F3 and then your box will be the golden rule of a box design? Again am asking for my own curiosity and for knowledge in this subject of building a box. Sorry if it’s been asked before. Thanks Jeff