how to upgrade this digital front end ?

Acouple suggestions. First I think you are wise to get the most from your red book CD's . The new foremat wars are not settled yet and unless you plan to dump all of your 44.1 CD's, get good playback equipment.

I went from a Krell kps 25 i/l to a wadia 27 i/x and 270 transport. Two units but they are connected with ATTglass cables. Wadia upsamples fron 44.1k to 256k. BIG.....I mean BIG DIFFERENCE (and the Krell was pretty good too.)

Others to consider are the new Krell unit. ARC has a CD3 player now for $4995 (new). Linn is great and so is accuphase. Except for ARC, you need to buy them used to get them for near $10,000

In a one-box unit under 10K, certainly don't overlook the Electrocompaniet EMC 1 Mk 2. Outstanding redbook for about 5K. Add a great platform (Mana/Neuance) and a FIM Gold power cord and you're up to a total of about 8K. Beyond this, separates will be required. They can easily tip the scales around 20K on up. Goodluck.

fatparrot: it's the accuphase 85v that plays sacd's. the 75v uses upsampling, unlike the earlier dp-75. the 75v can be upgraded to serve as an sacd dac, but its transport will not output an sacd signal. -cfb.

1) Get a Naim CDS2. Better and completely different than any digital I've heard. If you want more traditional CD sound, try the new Accuphase DP 85. 2) Try putting an ExactPower or Power Plant on your CD unit; a precisely controlled AC feed does wonders for digital.

Thanks for your reactions so far. With regard to the AC power: I'm already using a PS Audio Ultimate Outlet and P300 Multiwave PowerPlant with powercords from Wireworld, BMI, Electraglide and Marigo. Analogue front end: SME 20A turntable with SME V arm and van den Hul Black Beauty cartridge.