I'm using the fiio l3/l9. Stock 4r cable. When I said "small", I suppose that term is relative. It's big enough that I would never want to listen to my ipod without the amp, even if it was a little more inconvenient. ha. So, to me it's noticeable enough. But I think some people comparing them side by side might think "oh that's not really much better". But then again, I suppose I "am" on an audiophile forum. :-P haha.