Did you try this in your other post? http://www.cnet.com/forums/discussions/sound-2/
At 79, my hearing is failing and I find Internet audio too low and generally hard to hear. Can Cnetters help? Would a small amp do the the trick? An amp would increase volume of course, and it would also give me bass/treble control which is important when you find the bass drowning the treble (common with seniors). I listen with wireless earphones and use an aging iMac (2006-7). How may I get more volume, bass/treble control and still enjoy wireless earphones?