I was looking at GPA's parts list today for another reason and saw the 604-16LN and 604-16HPLN listed there.

Parts – Great Plains Audio

the 604-LN has the same LF as the 604E

There is no HF listed for it, so maybe it is the same as the 604E - 34852?

Or maybe the HPLN - 35153?

They both have Note 11, "For superior HF reproduction, use original diaphragm. If high power handling is required, and excellent HF frequency response is also needed, use diaphragm #26421 (16 ohms). Call us if you need advice on the proper selection of a diaphragm for your particular application."

I dont understand what "Less Network" would mean in context of this driver? Weren't the crossovers a separate p/n anyway?