Further, re Neo10 freq performance
... the pdf specs is based on open (dipole) driver performance (without a box). As it is, considering +/-3db deviation, Neo10 is considered at 700Hz-2.4KHz (almost).
But as pointed out in discussion, giving it a 2-liter volume (3'inch back box) will boost 300Hz-up output - probaby within +/-3db of 92db average, probably making usable freq from 300-2.4KHz (probably reason why Z92 still maintain cut-off at 2.4khz between N3 and N10). Take note that at this design, the below 300Hz will have a steep roll-off already (hardly usable).
Since this is DIY, and the proof of performance is in listening, we can still be a little forgiving on deviation. So if we consider +/-4db deviation, it is possible to really extend the freq response from 300-5.5K hz. In the mid range, this is a very good range.
In my book, the magic of any speaker is in the mid range. Thus, in many high-end design of vintage speakers, the choice of mid driver and the cross-over freq is seriously considered. In my my SB501, this is set at 500-5K hz. To me and my bro, the high and the low are icing on the cake, to enhance the palatability of the whole sound.
However, Neo10 should not be mounted on a baffle with its back open to the volume where the woofer also utilize the volume of air inside. Physics 101 tells me it might be damage by the excursion caused by woofer excursion.
