Here we compared the 2435 with the 435Be, the 2430 and 2431 drivers all on the H9800 horn. The response of the 2435 and the 435Be were essentially identical. The effects of the larger back cap and lack of ferro fluid of the 435Be was not noticeable in the frequency response measurement. It is quite possible that a subjective listening test would show a difference, but from strictly a frequency response measurement, they do appear very similar.
This series of measurements has shown us that there are potential hazards in buying used and untested merchandise, luckily JBL was able to come to the rescue. It also shows us a nice comparison of almost the full line of JBL's current crop of 1.5" exit 3" diaphragm drivers.
Originally Posted by
Mr. Widget
Here we see that the low end performance of the 435Be, 2435HPL, and 2431 are all quite good. It would seem that the larger back cap isn't necessary for performance below 1000Hz. We did not do any listening tests or power tests measuring distortion, but the initial measurements were surprisingly encouraging. I am not sure if it is due to the back cap or other tweaks, but the 435Be did exhibit, albeit by a small margin, the flattest overall response of the three.