bearortiger

If you check out the Sony Uk site (www.sony.co.uk) you'll see both models listed there. The only difference between the two according to the site and Sony's own catalogue in their shops is that the 520 comes with the new version of sonic stage and also has a digital amp. However I don't know what they really mean by 'digital amp' in a non-hi model such as this, given what I read in one of the recent posts about the amps available in all models. Whether it makes much difference in sound output remains to be same, and according to the listing on www.avland.co.uk, the output remains at 2.5mw. Hope this helps.