Question on Emm labs Dac6 vs Dac6e

Kgturner is correct. The differences are the added RCA connections and one less fan. Some of them had rackmount ability and some did not. Sonically there is no difference.

I don't see a fan outlet at the back panel of the Dac6, is it just a small fan inside the unit like what we have on a computer cpu?

Unless your heart is set on EMM, you may also want to have a look at the new single box Playback Designs MPS-5. Fellow audiogoner DCSTEP, oneobgin, and mikelavigne have commented extensively on its sound qualitys. The latter 2 preferred it over their own EMM multi-box rigs and have replaced their EMM with brand new MPS-5s. . . . at a fraction of the cost of EMM rigs.
Here is a review by Mike Lavigne:
http://forum.audiogon.com/cgi-bin/fr.pl?rdgtl&1212275915&openfrom&1&4#1

In mid September I will have the opportunity of comparing directly the MPS-5 with a TEAC P03/D03/G0s combo and a DCS Puccini stack. G.

What is the website of PD?

Guidocorona - I too have heard great things about the MPS-5 and read Mike Lavigne's review. But I question your comment about the price of the MPS unit being a fraction of the EMM labs rigs. I think I recall seeing "used" EMM labs rigs selling for $6 to $8K vs. the MPS-5 which has an introductory price of approx. $10K, but soon to increase to $15K. Please set me straight if my assumptions are innaccurate.