Just had to share these results... this is pretty awesome!
I've been working on a project for Cosmos here... he sent me a pair of JBL 2226H frames, that I converted to a "super 2235"... replaced the fabric-edge PA-woofer cone with the foam-edge "subwoofer" cone used by the 2235H. At the same time, I used an copper wire (instead of the aluminum-wire of the stock 2226) edge-wound voice coil with slightly longer winding (7/8" winding pack length, as opposed to 3/4" for the stock 2226) and a softer suspension (spider) than the stock 2226.
Well, the proof is in the pudding.
Tested the woofer using the Dayton WT3 this morning... here's the parameter set I got:
JBL 2226 Frame with 2235 cone and custom VC setup:
Fs= 30.95 Hz
Qes= .4164
Qms= 7.41
Qts= .3942
Vas= 5.607 cubic feet
Re= 5.264 ohms
Le= 1.18 (pretty admirably low for a 15- should have good HF extension!)
Mms= 171.5 grams
X-max= .35 inch (one-way!)
Sensitivity (1w/1m): 92.43dB
Sd= 132.7 square inches
To put it in perspective: in a 6.5 cubic foot enclosure tuned to about 28 Hz or so, this woofer is capable of 28.5Hz bass extension in freeair, BEFORE room gain is factored in! A stock 2235 only goes to 30.5Hz in this application.
Also, since this woofer has a GREATER X-max than the stock 2235, AND twice the power handling (2226 Vented Gap frame allows for 600w power handling, where as the stock 2235 frame with vented pole piece only allows for 300 watt RMS rating)... you can do the math there too.
Great thing is? It only costs a dead 2226 frame (from "that auction place" or wherever), and about ONE THIRD the cost of an OEM JBL 2235 recone kit, to build one of these! In fact, you CAN'T EVEN USE a stock JBL 2235 kit (C8R2235H, in JBL part number terms) in the 2226 frame (it won't line up- you'll wind up with an alignment train-wreck!)... but, by being able to pick-and-choose components, I was able to create a kit that was a PERFECT fit, and actually EXCEEDED the performance of the stock JBL driver!
I think this thing is going to be a true monster. I am looking forward to getting these woofers back to Cosmos, and getting reports on how much he's shaking stuff around in his house, using 'em...
Regards,
Gordon.
I've been working on a project for Cosmos here... he sent me a pair of JBL 2226H frames, that I converted to a "super 2235"... replaced the fabric-edge PA-woofer cone with the foam-edge "subwoofer" cone used by the 2235H. At the same time, I used an copper wire (instead of the aluminum-wire of the stock 2226) edge-wound voice coil with slightly longer winding (7/8" winding pack length, as opposed to 3/4" for the stock 2226) and a softer suspension (spider) than the stock 2226.
Well, the proof is in the pudding.
Tested the woofer using the Dayton WT3 this morning... here's the parameter set I got:
JBL 2226 Frame with 2235 cone and custom VC setup:
Fs= 30.95 Hz
Qes= .4164
Qms= 7.41
Qts= .3942
Vas= 5.607 cubic feet
Re= 5.264 ohms
Le= 1.18 (pretty admirably low for a 15- should have good HF extension!)
Mms= 171.5 grams
X-max= .35 inch (one-way!)
Sensitivity (1w/1m): 92.43dB
Sd= 132.7 square inches
To put it in perspective: in a 6.5 cubic foot enclosure tuned to about 28 Hz or so, this woofer is capable of 28.5Hz bass extension in freeair, BEFORE room gain is factored in! A stock 2235 only goes to 30.5Hz in this application.
Also, since this woofer has a GREATER X-max than the stock 2235, AND twice the power handling (2226 Vented Gap frame allows for 600w power handling, where as the stock 2235 frame with vented pole piece only allows for 300 watt RMS rating)... you can do the math there too.
Great thing is? It only costs a dead 2226 frame (from "that auction place" or wherever), and about ONE THIRD the cost of an OEM JBL 2235 recone kit, to build one of these! In fact, you CAN'T EVEN USE a stock JBL 2235 kit (C8R2235H, in JBL part number terms) in the 2226 frame (it won't line up- you'll wind up with an alignment train-wreck!)... but, by being able to pick-and-choose components, I was able to create a kit that was a PERFECT fit, and actually EXCEEDED the performance of the stock JBL driver!
I think this thing is going to be a true monster. I am looking forward to getting these woofers back to Cosmos, and getting reports on how much he's shaking stuff around in his house, using 'em...
Regards,
Gordon.