Quote:
Originally Posted by
InFn-0 
I see that you have a K601 also, could you please check out its performance with the CD5003 and compare with other amps you got? That would be very helpful!
OK. I listened for about 20 minutes to bits and pieces of 3 songs ("And It Stoned Me" - Van Morrison; "Mayor of Simpleton" - XTC [non-re-mastered version]; "IGY" - Donald Fagan). I felt the CD5003's headphone amp was pretty good - at least it stood up to my HeadRoom Micro Amp/Micro DAC combo.
First, the basics - loudness. No problem for the CD5003's jack to push enough volume through the K601.
Second, the sound. This is not a "warm" headphone jack. The HeadRoom Micro is a warmer amp, and the CD5003, while not something I'd say is "bright," does not convey the warmth of the Micro. The highs were nice and crisp, the mids maintained their texture in all songs - from the edginess of horns in "IGY" to Van Morrison's vocals - whether edgy or smooth. Bass was there, but it was not overwhelming. I think the CD5003 is a pretty neutral to slightly crisp amp, and when paired with a very neutral (probably very mid-range friendly if anything) K601, I got a technically satisfying music, but it wasn't anything that made me want to jump up and dance - not a negative, listening is a very, very pleasurable event. Maybe I should throw in some Public Enemy or Gorillaz to see what happens.
Separation was good. Nothing seemed smeary or mushed together.
I don't want to sound like some kind of equipment matching guru, but how much you enjoy the headphone jack is going to be driven by the cans you drop into that jack. A brighter can like the DT880 will be OK, but maybe you won't find it complimentary with the CD5003. Now, I've listened to the CD5003 extensively (well several hours, anyway) with the HD650, and to me, those two components make sweet music together. The D2000 isn't bad with the CD5003. If I picked my main cans to listen with the CD5003, I'd reach for them in this order:
1. HD650 (9 out of 10 points)
2. D2000 (8 out of 10 points - especially with "fun" music like hip hop and dance stuff)
3. K601 (6.5 out of 10 points)
4. DT880 (5 out of 10 points)
Just as another subjective reference, if I am listening to my turntable through my TX-8555, I'd reach for the headphones in reverse of the list above. The brighter DT880 works great with warmer vinyl and the TX-8555, whereas I find the HD650 way too warm, when combined with the warmth of vinyl.
Of course, all of this is one guy's opinion, and I have to add this disclaimer: YMMV! :-)