Well I got quite a few comments back on the CM500.
Firstly, I have extreme hearing loss. Without my Phonac-Silvia
hearing aids the world it very quiet. I have something like 30-dB
loss in both ears so not wearing them with headphones is not an
option. As many of you may know, hearing loss is not simply lack of
volume. I have a lot of problem with speech recognition.
For instance even wearing my hearing aids (which cost me $5200) I
still need closed-captioning when watching TV (at any
volume). Hearing weak-signals on ham radio I use my headsets a lot
(while wearing the hearing aids). My (now pretty old) Sony MDR-V600
stereo headphones do pretty well. Never any feedback with my over
the ear aids). Unfortunately the acoustic design of the CM500
produced immediate and continuous feedback.
I bought them along with the AntLion boom mic for comparison. The
AntLion installed on my "old" Sony headset work just fine and I got
great audio reports with the boom mic. So that made an easy decision
not requiring engineering solutions or "fixes" by my
audiologist. Main purpose was acquiring a boom mic for portable
operating situations.
Also hearing SSB with either NB or NR causes enough distortion of the
sound to make it harder to understand speech (yes I have tried all
the different settings). My hearing rolls off at 1000-Hz so I lose
the consonant sounds. Lake/take/bake/make... all sound like eight or ate.
Digital modes work well for me: I can read FB; volume can be set to
zero. When I run my 1500w amp for eme I do not wear my hearing aids
to lower blower noise (probably > 120 dba). CW I would need 40-dB or
higher isolation in the headset. I'm moving all my QRO amps out of
the shack for this reason (and for less coax line loss).
Thanks for all the helpful suggestions. Simple solution was to sell the CM500.
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubus...@gmail.com
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