Just a brief update on my “what type of dome vs. going to a custom mold experiment”.
For me ReSound medium power domes were too large, definitely larger than ReSound medium open vented domes. Pretty hard to remove from ear, gave a strong occluded feeling, could be uncomfortable when chewing, yawning, etc. Definitely improved speech recognition but lessened sense of sound directionality.
The ReSound small power domes are definitely a mm or two smaller than the medium vented domes. They are easy to insert and remove, give no sense of occlusion and I would say restore most but not quite all of the degree of spatial sound directionality lost with the occluding medium power domes. I would say that speech crispness, sensitivity is better than with the unvented domes, less than with fully occluding domes but maybe I’m at a relative sweet spot - need much more trial in a variety of environments to decide.
According to the UK site hearingdirect, the size of small power domes is 8 mm in diameter, medium 10, large 12. If anyone knows of a “power dome” from a different HA OEM likely to weigh in at 9 mm diameter and stay on a ReSound receiver, I would be much obliged to learn.
Would it be safe to say that dome fit on the receiver ought to work across the board for any major HA that uses Cerustop wax guards, as that consideration necessitates a certain inner diameter to the receiver nub a dome goes on?
Another question about domes is what type of material are they generally made out of. Can’t find ReSound stating for its domes but I presume the material is some sort of silicone compound. One of the reasons that I’m interested is to find out the approximate sound transmission/sound reflection properties by frequency for silicone material and thus by implications for domes. If anyone knows of a good table of sound properties of domes or dome material by frequency, I would also be much obliged for a link to that.