I’ve just began a trial of Marvel M90 Rs and I’m finding them unusable. My current aids are Phonak Audeo S, about five years old. Those are far from perfect and old enough that I’d like a replacement/ backup.
The trial aids came with closed domes. I’m told I would need to purchase the aids and have molds made to try something different. I have only two weeks for the free trial period.
The fitting seemed very thorough to me — basic audiogram, bone conduction, first fit, speech mapping with adjustments at three sound levels, etc.
I do notice the occlusion with the closed domes, but try to ignore that to evaluate speech recognition. My impression (after two days) is that it is close to my old aids in soft speech, but is much worse with a noisy background.
But the real killer is when I sing with an A_Capella group. Neither my voice nor the voices of other singers sound real, to the point where matching pitches is difficult. There comes a point as the music dynamic is increased where the sound just “shatters.” Other words to describe this might be overload or distortion. The result in any case is a loud, non-musical cacophony of sound that is impossible to sing against.
I’ve read the discussions that talk about 16 bit A/D converters that fail to capture the full dynamic range. The statement is that if the ADCs can’t handle the input, nothing you do downstream can correct it. While I have the general concept, I don’t know how or if modern aids cope with this (or if that is even the problem.) At any rate, this shattering with increasing volume seems like what you would expect if this were true.
At this point, I’m not sure what to do. Even if I knew the cause, I’m not sure that adjustments would help.
My next project is to upload an audiogram. But in the meantime, my loss curve is relatively flat at about 55 db up to about 1,500 Hz. It then slopes off to about 72 dB at 6 kHz. Both ears are close to identical over that range.