I am experimenting with the woofers (4") from an Andrew Jones SP-C22 center channel. Having the speaker parameters would be useful. I am hoping Pioneer will share the info, but if not I was wondering if anyone here could help. Thanks
Posted Oct 30, 2017, 12:56 AM UTC
You may have to measure them yourself. Something like a WT3 or DATS system from partsexpress should do the trick.
What are you looking to do with them?
Built a pair of bookshelf speakers modeled after the bs22lr based affordable accuracy monitors (improved tweeters and xovers in similar custom cabinet). Additionally I wanted to move the port to the front baffle as I intend to have them fairly close to the wall.
The result was ok, but I felt the bottom end was a bit thin/lacking. Want to model alternative cabinet size and port tuning to see if I made poor assumptions about the specific drivers I used.
Finally got around to making the measurements (2 woofers). Here are the results just in case someone is looking for this in the future.
Woofer 1/2
Fs: 102.1/107.1 Qes: .83/.90 Qts: .70/.74 Vas: .84/.74 Sens 1w/1m: 82.2/81.9
Using the info, it looks like the cabinets I had built have about 1/3 too much volume and are tuned about 20 Hz too high - likely cause of too much roll off or thin low end. I am hoping a redesign and new build will help these reach expectations.
You can measure T/S parameters using REW aoftware for basically free. This method has extreme accuracy using only a resistor, computer souncard input/output and multimeter.
You need to measure 2 impedance plots, one freeair and one with added mass to cone. You then combine them to get T/S parameters.
Impedance measurement:
https://www.roomeqwizard.com/help/help_en-GB/html/impedancemeasurement.html
T/S parameter:
https://www.roomeqwizard.com/help/help_en-GB/html/thielesmall.html
Thanks, I was aware it was an option but prompted me to order the right resistors to do it. Would still prefer some official numbers to compare.