Not a huge surprise, really. It's a fairly oldschool design for a cheap bread and butter driver. The 6, 8 and 10 PR-8 all seem to share the same motor, and I almost like the 10 more which has almost the same highs extension, even if Qts is starting to get concerningly high by this point (0.97 - magnet could use some doubling up, I guess). What can you even use that one in as-is, open baffle (but with only 3 mm Xmax?) or maybe TML?
The same motor assembly also seems to be used in the "cheesy spec" 6PF-8 (paper cone, foam surround), and I actually like that one even if it would be no help in the tuning department here (fs 73 Hz / Qts 0.79 - that makes a Visaton W170 @ 57 Hz / 0.69 look downright high-tech). Things get increasingly dire with the 8 and 10" versions.
The same motor assembly also seems to be used in the "cheesy spec" 6PF-8 (paper cone, foam surround), and I actually like that one even if it would be no help in the tuning department here (fs 73 Hz / Qts 0.79 - that makes a Visaton W170 @ 57 Hz / 0.69 look downright high-tech). Things get increasingly dire with the 8 and 10" versions.