Another "solution" if you wear headphones is to try a set of noise
canceling ones. I've not tried the Heil cans, but have used the
Noisebuster FX and Solitude as well as a Sennheiser HD 280 passive
set. The former at $69 work the best with the Centaur and are very
comfortable. My daughter, a musician, now has my HD 280's and I wear
the Solitudes when I'm cutting the grass!! That's not to say that
the more expensive Solitudes and Sennheisers wouldn't work best at
what they seem designed for, airplane travel.
I also bent the intake louvers to the horizontal plane which seemed
to reduce the "howl." So, I wear the Noisebusters all the time and
when I crank up the Centaur, I just flip a switch on the headphones.
Gary W7TEA
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