A purchase after that of HD 600

I own the HD 600 for many years and the rave reviews the HD 650 describing him as a worthy successor in top quality made me take the plunge.
For now, I compare the HD 650 (break 40h) with the HD 600 (several hundred hours of running).
Both headsets are very similar from the point of view of comfort. However, I note that the greenhouse HD 650 more and I think it will soften to join the HD 600 since the structure is the same.
The HD cable 650 is larger than that of the HD 600 is a plug and 6.3 mm instead of 3.5 mm. I prefer this configuration.

I listen to these headphones via a CD player headphone output Marrantz CD 5004. I have not yet yielded to the charms of the headphone amp vendors but I've done a comparison between an amp 800 and the headphone output the 6004 CD Marrantz not particularly excited about the relatively limited differences for me against the investment ...

Both headsets are very good (pitch for 2 gold), but quite similar but with some differences.
At first listening I was rather disappointed. The HD 650 is less neutral than the HD 600 and less detail means. The frequency response curve clearly shown: the HD 650 is highest at low frequencies but of the HD 600 passes above that of the HD 650 from 2000 Hz and is not very pronounced hollow to 12000Hz . All these technical differences are and agree that I prefer the HD 600 for all the music like variety, rock ...

So I began to regret this purchase (even though I had originally planned to have uses in 2 different places) until I listen to an opera extract (the chorus of slaves in Nabucco by Verdi). On this type of music, the HD 650 is better. More heat is felt in the voice. It's like in the field of photography: it seems that the HD 650 creates a soft focus in the background (in fact suppressing certain details kinds of public noise or musical instruments) but the voices seem enhanced.

In conclusion, if you really want to hear recordings of the details, if you rarely hear opera music (or jazz or voice is often an instrument) rather take the HD 600. I think he rendering close triangle pregnant (type zérius 202) but with additional details and voice further.

Maybe lapping me change my habits but for now, I often start listening with the HD 650 and then I leave for HD 600 I can listen to full hours so I appreciate it.

The prices are similar, only the differences in expectations of each can intervene in the choice.

One last detail: I sometimes plug the HD 600 on a Realtek HD audio card) to listen to music on Deezer. The result is more than acceptable (despite the 300 Ohm impedance). He even gives better results (with the volume set low!) That my Philips SHP 8900 which has a 32 Ohms impedance.
By cons forget the headphone outputs of players, telephone or other digital tablets. Here the result is really bad and helmet 15 Euros give better results.