I’m not comparing my own fitting vs the OP, and I don’t need to, either.
That’s because it’s not about me, it’s about another poster who started a different thread who wondered why he was still having so much issue with noise despite using the More 1 and expecting that the More 1 to do a good job reducing the noise for him. So I opined that it looks like he uses open domes and that’s probably why -> the noise enters in through the open domes’ vents, so no matter how great a job the More 1 does at noise reduction, it’s probably all for naught.
It looks like the OP in this thread (@bumbrlik) is in the same boat, so he wanted to try the double vented bass dome because of what he read in the other thread mentioned above. It seems like it’s an acceptable compromise to him because he didn’t feel too much occlusion with the double vented bass domes.
When you pointed out to the OP that he made a mistake in using the double vented domes and should have used the open domes, perhaps you missed the point he made that he was willing to make a trade-off of foregoing the advantage of the open domes in order to gain more benefit from the More’s noise reduction. It was a deliberate choice from the OP.
So I wasn’t comparing my hearing with the OP. I was just reaffirming that the double vented domes is not completely closed, so it’s not a mistake to forgo the open domes for the double vented domes like you pointed out to him. You said:
Open domes should not be the de facto fitting choice for people with normal hearing in the low ends for all cases. If all they want is amplification to compensate for their hearing loss in the high, and they can manage the noise just fine without needing any noise reduction support, then yes, open domes makes sense. But if beside amplification for hearing loss compensation in the highs, they also need assistance with noise reduction, then they will not get that noise reduction assistance from the HAs if all the noise is let in through the open domes’ vents just the same.
You opined that “open domes might give you much more lower frequency sounds than the aids which would improve your speech in noise”. I find a number of things wrong with this statement:
Being able to hear more lower frequency sounds than the aids can deliver does not guarantee speech in noise improvement. Not if the lower frequency sounds are not just solely the components of the speech, but also included a lot of noise. And in a noisy environment, there are for sure plenty of lower frequency sounds that are noise.
The other fallacy of your statement is that the aids cannot deliver the lower frequency sounds the OP would need to get the sufficient SNR for speech in noise improvement, and only the natural low sounds through the open dome’s vent can deliver this. For sure the aids can deliver low frequency sounds, maybe not as low as 20 Hz, but hearing aids are designed to go to as low as 125 Hz, or 250 Hz at the worst case.
And whatever low frequency sounds between 20 Hz and 125 Hz that the aids can’t deliver, don’t forget that the 2 vents in the bass dome should let them through. Maybe the 2 vents can’t let them through as completely wide open as the open dome’s vents, but it should suffice. And guess what, the sounds between 20 Hz and 125 Hz that can’t be amplified by the aids, they’re most likely not components of speech sounds anyway. They’re most likely components of HVAC fan noise or something like that. Nobody can talk that low, even folks with a low voice.
- As long as the OP’s HCP specifies the correct fitting (double vented bass dome) when doing the programming, Genie 2 will take this into consideration and boost the gain in the lows and mid slightly to compensate for whatever gain the OP might have lost from the difference between fitting an open dome and a double vented bass dome. So it’s not an automatic that by switching from open domes to double vented bass domes, that the OP would lose out on some of the low and mid hearing. Genie 2 will compensate for this such that whatever arrives into his ear canal (the combined amplified HA sound and the ambient sound) would be very close in terms of output gain between the 2 fittings.
The bottom line is that the main concern of going from an open dome to a double vented bass dome is NOT loss of gain in the lows and mids. Like I said above, Genie 2 will make sure the HA will compensate for that. The main concern going from an open dome to bass dome is how much worse occlusion may be to the wearer. Is the wearer going to be able to tolerate and accept it as a trade-off for other things (like improved noise reduction)? If yes (like the OP has mentioned), then in theory, using the double vented bass dome is usually more advantageous.
So it’s not about comparing my hearing loss and acoustics to the OP’s. I’m not saying that if double vented bass domes works for me, it should work for him. I’m only telling the OP that if the theory of the trade-offs between bass domes and open domes (as discussed before) sounds right, and if he tried it and found it to work, then stick with it.