Variables? Let's not forget that each person's ear, from outer to inner ear, is made slightly differently. Some people have large pinnae, others small. Some have large auditory canals, others have them long and sinuous. That is why some companies offer custom earspeakers, aided by wax molds...

Hey Kouzelna,   Thank you for your reply. I spoke with Len at History of Recorded Sound and he confirmed that they service the Glow amps. He said replacing the headphone socket would cost $120 and it would remove most hum but not necessarily eliminate it because of the way it was wired. Since...

Exactly. MP3 files are lossy, compressed files. They've already thrown away a lot of information. If you're going to use top-end equipment you must have the best music files. At the very minimum import CD's into your MacBook as Apple Lossless files.

Hey, I'm new here and I've spent most of the last few days reading and learning from you guys at Head-Fi. Thanks, lots of collective knowledge and information!   And, browsing through Head-Fi I came across the two threads on the Amp Glow One, an amp that I've owned for several years. It powers...