605B with GPA Cones, measurements

I've been contemplating pulling my 605B off the shelf and actually do something with them. I've had the for some time now. Sent the to be re-coned a couple/few years ago and GPA installed 604E cones in them.

Soo.. I have no idea hot or anybody that does know how to measure the theile paramters. Anyone here measure them? Anyone in Houston want to volunteer to help me measure mine?

Thanks
Steve

Steve
Can you measure the impedance of the woofer?
Do you have an Ohm meter?
What is the resistance of the HF Driver,and the Woofer?
Don

I have measured my GPA recones via the PE WT3. I have 3 of them and the following is representitive after a couple of hours of break in. The data was taken at a 3,000 ft. elevation in the Sierra Nevada foothills.


*
* Manufacturer:
* Model: Altec 605-A GPA 604E recone
* Piston Diameter = 322.6 mm
* f(s)= 25.57 Hz
* R(e)= 12.45 Ohms
* Z(max)= 116.90 Ohms
* Q(ms)= 3.215
* Q(es)= 0.383
* Q(ts)= 0.342
* V(as)= 742.800 liters (26.230 cubic feet)
* L(e)= 2.31 mH
* n(0)= 3.09 %
* SPL= 97.00 1W/1m
* M(ms)= 48.93 grams
* C(ms)= 0.79 mm/N
* BL= 15.98

It will be interesting to see if others post their data and how different units compare. BTW, this data is about 4 years old.

Good luck with your project

Quote:

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Originally Posted by donaldpatten

Steve
Can you measure the impedance of the woofer?
Do you have an Ohm meter?
What is the resistance of the HF Driver,and the Woofer?
Don

---

HI Don,
Are you looking for the pure resistive measurements for the drivers? I can certainly do that easily, if your looking for the impedance including inductance i'll have to rig something up and measure it indirectly.

Steve

Manzanita!!! thanks much! Exactly what I was looking for! Did you ever do anything with your 605's?

Yes, I have used them several ways, in a 5 cu. ft. sealed box, and twice in OB trim at the Lone Star Audio Fest. Also once in a very simple OB with small sub at the Northern CA DIY meeting in 2005 I think. You can see some LSAF pics and write ups here:

Lone Star Audio Fest 2008 - Event Reports - Dagogo

lone star audio fest 2008

http://www.hifizine.com/2010/06/lone-star-audio-fest/

Just scroll down until you find them.

What do you plan on doing?