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I'm posting this for a acquaintance of mine. He is a speaker aficionado and actually talked me out of a prospective sale because he didn't think the speaker fit my application well enough. He is extremely honest and knowledgeable. He has woofer testing equipment and gave spec sheets to me for each woofer, which I will post below. The drivers are modified slightly. He epoxied a "bucking" magnet onto them since he desired them to be at least "half-shielded." The woofers have been tested after this modification.


Official Specs
http://www.datasheets.pl/SPEAKERS/AUDAX/hp170z2.pdf

Specs after modification:
Driver 1

* f(s)= 54.51 Hz
* R(e)= 5.65 Ohms
* Z(max)= 23.54 Ohms
* Q(ms)= 1.651
* Q(es)= 0.521
* Q(ts)= 0.396
* V(as)= 27.560 liters (0.973 cubic feet)
* L(e)= 0.91 mH
* n(0)= 0.82 %
* SPL= 91.22 1W/1m
* M(ms)= 8.48 grams
* C(ms)= 1.01 mm/N
* BL= 5.61

Driver 2

* f(s)= 53.83 Hz
* R(e)= 5.69 Ohms
* Z(max)= 23.35 Ohms
* Q(ms)= 1.649
* Q(es)= 0.531
* Q(ts)= 0.402
* V(as)= 27.070 liters (0.956 cubic feet)
* L(e)= 0.92 mH
* n(0)= 0.76 %
* SPL= 90.90 1W/1m
* M(ms)= 8.85 grams
* C(ms)= 0.99 mm/N
* BL= 5.66
 

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I would get them as I've been looking for a set (again) but that magnet means bigger mounting depth and they won't clear the window when it's down... :(

Free bump, these are very musical drivers everyone. Definitely worth the money.
 

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Discussion Starter #3
I was very impressed with some of my 4" Audax drivers and I thought these would be a steal, but they probably aren't best suited to my car. I'm sure they would make for a hell of a set of bookshelf speakers.

Thanks for the bump
 
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