In this video I finally break down something that confuses almost everybody at first: dome selection. The little silicone tip on the end of your hearing aid is way more important than most people realize. If your aids are whistling or squealing (feedback), or if your own voice sounds loud, boomy, hollow, or like you’re “talking in a tunnel,” that usually comes down to the dome type, the dome size, and whether the aid is actually inserted all the way into your ear canal. I explain occlusion (how much the dome seals the ear canal) and why it matters. The worse your hearing loss, the more volume you need, and the more you typically have to “trap” sound in the canal to prevent the feedback loop—sound leaks out, hits the mic, gets amplified, and repeats forever. I walk through open, tulip, closed, and power (double) domes, and my general rule: stay as open as possible with the least occlusion you can afford. Then I show a live demo in Philips fitting software so you can actually see the feedback margin. With a severe loss and an open dome, leakage is huge and the software has to kill your high-frequency gain to avoid feedback. Swap to a power dome, the leakage disappears, and you can keep that “beautiful” high-frequency amplification. OTC users especially need this, because you don’t have clinic software—your best fix is physical: the right dome and a proper insertion.