We already established what level of digital player I think bests a WM D6. An ipod. Your results with an ipod suggest you're doing something wrong. Either using lousy source files, headphones that are a mismatch with the amp, or something else equally glaringly wrong.
Good digital: Well recorded music stored in digital format, without glaring errors in recording or analog to digital conversion.
My budget isn't that high, but I was fairly involved in live music recording in the early to mid 90s. Until good portable analog to digital converters were affordable, I used portable cassette recorders. The only one I really liked was the PMD-430.
The trick is you're testing with tones, instead of with music. Music is affected by how the speaker transitions from one frequency to another. You need to pick a challenging piece of music, and plot it over time to get the whole picture.
No, the Nak 550 was a full sized cassette deck, made portable.
The PMD430 was stereo, wtih DBX.
I've owned all 3 of these portable cassettes, and good digital is still worlds better. If what you're hearing from your ipod is thin and lifeless, then the problem isn't the ipod, it's somewhere else.
We'll just have to disagree. The inherent problems in cassette aren't improved with a D6 (yes, I've owned a few), and an ipod with good source material can sound a hell of a lot better than anything the D6 can manage. The only "portable" cassette that comes close is the Nak 550, and well. That thing was a monster. The Marantz PMD430 can sound VERY good, but it's still not going to outperform an ipod with good source material.
I'm sorry, a WMD6 is not a better source than an ipod if you use a decent amp with the ipod. That doesn't mean portable audiophile rigs aren't silly, tho.
I've never thought frequency response would be impacted by going balanced. Control, slew rate and power, which are hard to show in a static graph, are what I thought was improved by going balanced.
It has been a good year to be a caps fan. Every game is something new. It's like the "who did we lose today" lottery each week. When the team is healthy they're awesome, and they still manage to win most days when they're not.
I'm not sure why you think the fan running is a concern. As long as the laptop doesn't overheat, there's no risk other than a few decibels of noise. It's an annoyance with open headphones, but that's not really the target market for the duet, and even then, you'll only hear it if there's no actual music playing.