Theil and Small Parameters for the AudaxPR170MO

Also tested with the WT3 while it was in my possession, here are the T/S specs.

* Piston Diameter = 133.3 mm
* f(s)= 97.57 Hz
* R(e)= 6.14 Ohms
* Z(max)= 27.44 Ohms
* Q(ms)= 1.754
* Q(es)= 0.505
* Q(ts)= 0.392
* V(as)= 10.820 liters (0.382 cubic feet)
* L(e)= 0.25 mH
* n(0)= 1.90 %
* SPL= 94.88 1W/1m
* M(ms)= 6.74 grams
* C(ms)= 0.39 mm/N
* BL= 7.08

Theil and Small Parameters for the University C15W woofer (silver frame)

I recently had access to a Datyon Woofer Tester 3 to test the T/S parameters of this excellent vintage woofer. When I can, I'm also going to post comparative measurements using my ARTA jig. Of note, .. I consider the dual voice coil C15W to be a highly excellent woofer for my Karlson K-15 enclosure. Despite what literature would have one believe, I've sen Karlsons to be picky about what drivers they like (they prefer low mass cones, low Qts drivers). This driver+cabinet enclosure didn't just make the walls shake. It literally moved the whole first floor of place up and down. I don't think it made much bass below 50 Hz, but this is a real 50 Hz, not 50 Hz produced by some "subwoofer" you buy in the big-box store.

What does a Karlson look like? Here's a picture (not mine)


Series Voice Coils

* Piston Diameter = 330.2 mm
* f(s)= 69.98 Hz
* R(e)= 6.63 Ohms
* Z(max)= 74.00 Ohms
* Q(ms)= 3.708
* Q(es)= 0.365
* Q(ts)= 0.332
* V(as)= 91.420 liters (3.228 cubic feet)
* L(e)= 1.41 mH
* n(0)= 8.19 %
* SPL= 101.20 1W/1m
* M(ms)= 58.27 grams
* C(ms)= 0.09 mm/N
* BL= 21.58

Parallel Voice Coils

* Piston Diameter = 330.2 mm
* f(s)= 69.98 Hz
* R(e)= 2.32 Ohms
* Z(max)= 18.89 Ohms
* Q(ms)= 3.965
* Q(es)= 0.554
* Q(ts)= 0.486
* V(as)= 91.420 liters (3.228 cubic feet)
* L(e)= 0.36 mH
* n(0)= 5.39 %
* SPL= 99.42 1W/1m
* M(ms)= 58.27 grams
* C(ms)= 0.09 mm/N
* BL= 10.35

Unlocking Iphone Saga

Not really audio related in the strictest of senses, but since an iphone is a fairly handy multimedia device, I figured this saga was blogworthy.

In short, I bricked an iphone whyile trying to install the 3rd party App Installer using the excellent program Ziphone. Had to crawl through tonnes of ill described articles and many juvenile youtube "how-to" guides.

I'm linking to the article that worked for me . I also found the following youtube useful to follow along in real time when trying to get the phone into DFU mode (timing is critical)