Dave Hachadorian wrote:
>
> There are two major problems with turning off the K3's AGC:
>
> 1. There is very little dynamic headroom until the AF Limiter
> causes severe distortion on even a moderately loud signal, even
> if the AF Limiter setting is max.
>
That's not necessarily true, although probably true with most headphones on
the market. Assuming non-impaired hearing, the effective dynamic range will
be highly dependent on your baseline (ambient) noise level and subsequent
gain settings. That's why K3NA strongly emphasized the need for high
isolation headphone schemes in his original treatise on AGC-less contesting.
The higher the isolation, the greater the ability to hear low audio levels,
the lower the needed gain setting, and the greater the dynamic range before
onset of distortion/clipping/painfully Loud levels. With the highest
isolation schemes, distortion/clipping rarely occurs while the weakest
signals are still rendered audible. I know that in-ear type phones ("ear
buds") can be very successful in this regard, but long term comfort is
suspect. Every over-the-ear headphone I've tried so far that was touted as
"high" or "extreme" isolation didn't quite deliver the degree of isolation
that was hoped for, and weren't any better than my Sennheiser HD-280. I'm
still searching for more isolation without compromising comfort.
73, Barry N1EU
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