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In Reply to: RE: I would stop worrying about 'theory' and accept what you have and go with it. posted by 3+4=5 on December 26, 2016 at 20:24:16
I agree with much of what you are saying. I do not have much confidence in the quality of the headphones they use for the test. There was another issue that really bothered me during the test. I could actually hear my own breathing and other random body noise such as swallowing, etc.
These extraneous sounds were very distracting to me and I told the audiologist that. Of course, she had no reply. Many times it appeared they were masking the test signals. I am not really confident I accurately reported what was intended to be heard as a result.
I also fully agree with you on demonstrated and detectable changes after a new equipment acquisition. Last year I replaced a 20 year old Wadia DAC with the Berkeley Reference and TARA Labs RS-1 interconnects with the very pricey Zero Evolutions. Both times the changes were dramatic and not subtle at all. I could list the differences each time without hesitation and I was very pleased with my choices.
The brain may be compensating for any differences or shortcomings in our senses. That would help to explain why both you and I can still detect the defintion changes you mention.
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If the tests were not made under proper conditions including an acoustically-isolated enclosure and sealed sealed over-the-ear calibrated headphones, the results are unreliable. Your ability to hear extraneous sounds is indicative of inadequate test conditions.
Clearly, however, you have reason to be concerned and the best possible procedure would be to have a full assessment at a major specialized medical hearing clinic/insititute, like House Ear Institute, to get this resolved. There are similar others in the USA.
The distracting sounds I was hearing were my own internally generated bodily noises not those external to the control booth. The chamber itself was very quiet with a door that sealed. I was not aware of any environmental influences.
I do not know what could be done about this. Was it a fault of the headphones? The audiologist had no response to my complaint. This does cause me concern regarding valid and reliable results however.
I misunderstood. Hearing your own internal sounds is an indication of good environmental isolation. There is no way to suppress such perceptions.
Nonetheless, I would still suggest a work-up at a major hearing center. Bilateral loss of that degree is something one can deal with but you should determine if it is just one point on a progression and if that progression can be slowed or stopped.
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