My ER4Ps are over a decade old. Rarely do I need to change filters, but my spouse borrowed my headphones and completely clogged one side, given that there was no sound. It almost seemed like the channel went bad, but the test is removing the old filter and listening for sound.
If you still have the case that came with your headphones, you may have the tool already. I see on their website you can buy just the filters, but purchasing here with the tool was more convenient for me. They sound much better, as I had been listening with partial attenuation for some time. Parts look authentic.
If you channel is actually bad, you can send your headphones to Etymotic Research for repair. I did that once years ago, and it was something like 50.
|商品尺寸||4 x 0.5 x 0.5 cm; 5.67 克|