I decided to get to the bottom of this. I used the SPLnFFT app on my iPhone 6s with 10 second measurements using a of the built-in speakers of my late 2012 MBP.

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Every Mac blog and help page out there overwhelming suggested the BOOM Volume Booster so I immediately went to Amazon & discovered it was only $6 & change. I thought, hell what is there to lose, I'll give it a try.

1st round was sans Boom 3D. Max DB was 80.5. The second round was Boom 3D enabled and overdriven to the max with flat eq settings. Max DB was 79.2. Did a repeat with earphones plugged in. 1st round sans boom 3d, max DB 65.3, 2nd round Boom 3d enabled and overdriven to the max, max DB was 64.6.

Tested as of July 31st, 2018. Disappointing results for this hard of hearing fellow. – Jul 31 at 9:08. A should do the trick so long as you output to something other than the built-in speakers. That includes headphones, earphones, in-ear headphones, speakers, and all the Bluetooth equivalents. There are highly portable ones that are powered completely by the USB port.

The is compatible with Mac, Windows & Linux, but not mobile devices. The works with Mac/Windows (unfortunately not Linux) but does work with mobile devices such as iOS and Android phones/tablets with adaptors. Note that the red one outputs higher voltage than the black one according to this. This means more gain, and/or that headphones that require more power for the same Decibel can be used compared to the black one.

There are others out there to explore too at varying price points. These are just a couple of popular examples.