I originally thought like you, but Jitters is the enemy of Digital audio. It not only come from Clock oscilliators, but also come from Capacitors of Surface mounting Caps, especially Tantalum and ceramic capacitors. Regardless of how good your equipments is as long as you are using it, there are Jitters
If you have DAC desktop and it only uses Electrolytic capacitors then it is good, but it still can not outperform Polymer Multi Layers capacitors or PML. It was made for this purpose, to eliminate Jitters. Most of sensitive devices such as clock oscilliators regulators or frequency reception IC will need it.
The DMP uses virtually Electrolytic that is newly developed with the mean to also eliminate jitters, and the PML everywhere , also F-Resistors at each resistors. This alone is the reason to buy DMP, a done right Digital Source by itself. Everything else can be put for debate or whatever. I had been refusing to buy a DMP, but since I heard it at Canjam, the sound haunted me, and I wanted to find out more....technically....and the more I found out....the more I wanted it. Especially for my Stax system
PML are made by your very well known Rubycon, who made the legendary BlackGate caps. You can see this spec sheets it only available in very low capacitances. In order to build the DMP virtually with all caps to be PML, Sony had to customize and special order/engineers it into specs. Something only Sony can do and no one else
Beside the 0 Jitters benefit, these PML is also preserving original frequencies very well, or very high frequencies retentions
*please allow me to also give special note, even Expensive Desktop DAC will not be built with this many different PML caps and F-resistors*. Those are technical informations. However, you have to listen to it and decide for yourself of what you want. IMO, if you loved the 1Z, and not prepared to rob a bank, do not try DMP....because you will regret it
http://www.rubycon.co.jp/en/catalog/e_pdfs/pmlcap/Outline_Eng.pdf
http://www.rubycon.co.jp/en/products/pmlcap/technote.html