The issue with the Bravo amps and high sensitivity cans is that it has a ton of gain (+30dB), where the gain on the LD 1+ is both lower and adjustable. With high sensitivity and a fixed line level input, you'll barely have any adjustment in the volume pot on the Bravo.
thanks for your quick response. besides what you've said about the volume, are there any other potential issues or inadequacies based on the specs? I am just primarily worried about sound quality.
I've also read somewhere that you should have the output impedance of the amp 1/8 of the headphones, but from my experience a 4ohm impedance headphone amp must be truly rare as I haven't found anything like that.