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Thread: Benefits 16 channel vs 8?

  1. Default Benefits 16 channel vs 8?

    Hi, while I'm new here I've been on boards for years and I hope it's ok if I jump right in with my questions. I've done a lot of reading here and elsewhere and haven't found answers to these questions. I have a very professional audiologist and a relative is an audiologist. I'm looking at the Unitron, which is owned by the Dainish firm, Sonova Holdings. The latter also owns Phonak.

    I'm told Unitron gives more bang for the buck in terms of features.

    I'm also looking at the Zon on the recommendation of my relative audiologist. My audi called my relative who is 1,000 miles away, and we talked on the speaker phone. She wound up saying the unitron would be fine and not to worry about the water proofing issue. I didn't get to ask her the question I'm asking here. She's a long time audi with a nursing degree and works in her husband's office. He's an ENT. They don't sell aids.

    The question my audiologist couldn't really answer is, given that an 8 channel Unitron costs $3,000 and a 16-channel $4,000, what is the marginal benefit of the 16 over the 8? What is the percentage improvement in performance, etc. Is it worth it. He says the 16-channel gives him the ability to tune the aid better.

    Thoughts?
    Last edited by Steep slope; 07-24-2008 at 10:40 AM.
    67. Tinnitus since about 11. Haven't heard humming birds for 55 years. Normal low sounds. Right ear: srt 15 speech discrimination 100%@60 db; left 10, 96%@55db.

  2. #2

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    i like the Next 16 with auto pro 3
    it is a nice instrument...

  3. #3

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    This is what my Audi told me too. The more channels helps her fit better. I just trialed the Next 16, and it is a good aid. I still have it and have not TOTALLY ruled it out, even though I do like the current Widex Passion. Good Luck.
    L 250 - 45 R -50
    L 500 - 50 R -45
    L 1000-45 R -45
    L 2000-55 R -50
    L 4000-55 R -30
    L 6000-20 R - 0

    SRT: L - 55 R - 50
    MCL: L - 65 R - 65
    UCL: L - 85 R - 80
    DIS: (%) L - 88 R - 72

  4. #4

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    t he next 16 has auto pro 3 which means it has 3 automatic programs so the instrument switches automatically to each program - i believe are quiet, noise and speech in noise.. i

  5. #5

    Arrow

    Quote Originally Posted by Khenkels
    This is what my Audi told me too. The more channels helps her fit better.
    I have to take issue with this overly simplistic view of the situation. Now sure, your audiologist may have 'dumbed it down' for a patient, but I don't really accept that this is true.

    For starters, a really thorough hearing test considers results at 250Hz, 500Hz, 750Hz, 1000Hz, 1500Hz, 2000Hz, 3000Hz, 4000Hz, 6000Hz and 8000Hz. That's 10 different frequencies. If it were truly critical to a good fit to alter the frequency output at 16 frequencies, wouldn't a test typically include a test of 16 different frequencies?

    Next, we need to consider the issue of bands. These split the channels down further to provide more fine tuning.

    Finally, at least for this answer, we need to consider how adjustable each channel is. If you get a 16 channel aid and adjusting one channel affects maybe 1-4 other channels when making adjustments, then you don't truly have the flexibility of certain other aids. You also need to consider what adjustments can be made with each channel, along with a massive variety of other factors.

    To put it in other terms; can you state unequivocally, that a eight cylinder engine is ALWAYS better than a six cylinder engine? Is American NTSC television that updates 60 frames per second superior to European PAL television that updates 50 frames per second?

    There is so much more to a hearing aid than how many channels it has.

  6. #6

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    Yes, maybe over simplified; but I do trust her as she has be dead on with everything she has told me so far. Kinda hard to understand why they would sell and 15-20 channel aid if it were not something that worked?? When I went to the higher channel and additional bands, I seen better results. Just a HA user opinion..
    L 250 - 45 R -50
    L 500 - 50 R -45
    L 1000-45 R -45
    L 2000-55 R -50
    L 4000-55 R -30
    L 6000-20 R - 0

    SRT: L - 55 R - 50
    MCL: L - 65 R - 65
    UCL: L - 85 R - 80
    DIS: (%) L - 88 R - 72

  7. #7

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    I like the next 16 better than the next 8 because the 16 has auto pro 3 which means it has 3 autimatic programs its shifts to while the next 8 has the auto pro 2 to automatic destinations, this i think is more important than the number of channels / bands. By the way speech int. is maximize with about 4 channels....

  8. Default

    I've seen some have 20 and 24. Are they a bit too much or never too much?

    Just curious.

  9. #9

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    I am going to ask my Audi this question...and show her the responses to help me understand....nothing more. I know which aids (that I have tried) work better than others). It seems just by reading that the channels are useless...just a marketing hype.
    L 250 - 45 R -50
    L 500 - 50 R -45
    L 1000-45 R -45
    L 2000-55 R -50
    L 4000-55 R -30
    L 6000-20 R - 0

    SRT: L - 55 R - 50
    MCL: L - 65 R - 65
    UCL: L - 85 R - 80
    DIS: (%) L - 88 R - 72

  10. Default

    You only need 4 or 5 compression channels, according to the researchers.
    (Compression changes the real-time non-linear behaviour of the aid in a frequency region)

    There are however sometimes also equaliser style bands overlaid on the core compression channels.

    These extra-fine gain adjusters are useful for:

    * profiling unusual audiogram shapes more accurately than usual
    * notching out frequency resonances which seem to feedback too much
    * notching out fixed environmental frequencies: for example if you work in a gas turbine hall

    The other advantage of fine bands is that the automatic noise reduction software can adjust the gain and noise reduction algorithm and also the directional microphone steering for each frequency. So, the more bands the more chances you have of quieting frequency specific noise sources.

    One point: a hearing aid has to filter frequencies using banks of digital filters in software. These filters cannot say stop 100% of all sound below 1100 Hz and allow 100% of sound between 1100 Hz and say 1200 Hz, and then block 100% of sound above 1200 Hz. Filter have 'soft' edges not right angled edges.

    This means that if you boost the gain drastically at a certain narrow frequency you will either 'drag' the neighbouring bands with you or possibly the fitting software will simply prevent your dragging the gain bar too far away from the neighbours.
    My professional details can be found in the 'Hidden Content ' section of the forum

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