Like many, I find the price point of noise cancelling headphones pretty high. I recall literally 15 to 20 years ago yet, listening to Bose noise cancelling headphones, and they were very good way back then at cancelling exterior noise. Being an akg k702 owner, I already have a fairly decent pair of headphones that are not noise canceling. I was looking around to try a noise cancelling pair , but had no intention to spend some 300 to 500 on them.
I ended up buying some Boldtune on Amazon for 57.00 CAD. Limited time special. For 57 bucks, not only do they do a pretty good job at noise cancelling, have a great charge time and length, but they actually mimick the look of the new bose.
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A Good amplifier requires a adequate power supply, It does not matter what the amplifier is capable of if the power supply will not provide the power required. Most amplifiers have under rated power supplies. It is up to you to make sure you get the ones that are least under rated if at all.