| A few ideas:
Try the old driver in the good speaker, the one that has always worked. If it sounds ok, then obviously there was another problem all along.
There might be an intermittent problem in the crossover or in the wiring that temporarily cleared after you replaced the driver.
If you can, connect both speakers to the same amp output and send a 500 Hz or 1k tone into the amp input. Use a AM meter and measure the voltages at the terminals of each drivers. The voltages should be the same. If they are the same and the sound levels are different, you have a bad driver. If they are not the same the fault is probably inside the speaker. In that case, for further confirmation, you could swap drivers. If the voltages do not change, the problem is definitely in the speaker. |