Outside the box idea....

I flew the shorts, very loud. I bought the Halo from Quiet Technologies, then got custom ear molds (for shooting ranges) drilled a hole them, and put the speaker tube into it. I did this because it was more comfortable than using foam ear plugs, especially for long flights. But then I wondered after a few years if Bose was better, so i bought the Bose X. Brought both on the flight, tried them one after another, side by side, did this for a few flights, and the Halo with the plugs was just as quiet, no differences in the sound cancellation. 1/4 the cost, and way more comfortable. This is in agreement with reviews I've read about he halo vs. the bose on different forum threads. So I sold the bose. Also wore the telex 850 in the citation, couldn't stand how loud it was at lower altitudes, brought in my halo the next day. You could also do this with any in-ear headset.