Audio Aeros

I suggest calling or emailing Globe Audio Marketing, which is the US distributor for Audio Aero. They are very knowledgable and helpful folks and can answer all your questions.

http://www.globeaudiomkt.com/

The suggestion to contact Globe Audio is correct, Jody is a great guy and wether email or phone ,he will get back to you.
I have owned the AA Capitole MkII SE for about a year and the major difference between that and the previous MkII is that the SE features a $700 upgrade that replaces the D/A board capacitors, mounts the new ones on special Symposium pads for resonance control and swaps the stock 6012s with cryo'd versions. A noticeable and nice sonic difference.
The other difference is that not all of the MkII's were set up with the same back panel.Where as the SE version is a CDP/DAC/PRE with both XLR & RCA inputs & outputs, not all of the MkII were set up this way.(some do not have the XLR input).
I am not certain but I believe that the current
Reference player is the same as the MkIISE without the SE upgrade but the same in that it is fully functional as a cdp/dac/pre.
They are all capable of supurb redbook playback.
I'm sure that Globe can answer with more certainty.

Ludimagis is correct about the diferences, but I have one AA capitole mk2, I did not make the upgrade to SE version yet, but I listened to AA reference for some days and the AA capiloe mk2 was better in all aspect, besides has 2 or 3 kgs more, I listened with two friends the two AA, and all of us noted the diference , The AA capitole mk2 is fenomenal,I ask abou this diference to the AA seller and he said that after a period of burn the reference will be better, I did no understand this because the AAs were news , and if depend of burning the AA cmk2 was getting better too. All I can say is that AA capitole is the best cd player I listened, pristine and clear.

The MKII is oldest version before some minor revisions to the transport and tubes. The Reference is the new name for the latest version with all the goodies. The MK II SE is the same mechanically as the new reference, just old cosmetics, but sonically identical as the new reference.