If he is using the adapter I mentioned with the USB input on his Vincent SV 237. Then he isn’t using the iPad’s DACs. However, I am not sure which adapter he bought, so you could be right.I believe iPads use Cirrus Logic dac's. I have studio dac's that use Cirrus Logic chips and I also have units with Burr Brown chipsets and Wolfson Chipsets. I prefer the sound of the Burr Browns, then the Wolfson chips. The Cirrus chips come in a wide variety and I imagine the ones in the iPad are the same used in the new iPod Classic (good but not outstanding). Older iPod Classics used Wolfson chips. I own both a new iPod and the older classic and the difference is very noticeable to me. I put together a dedicated media pc (Burr Brown chipset) which I have hooked up currently to a Sansui 5000X. Its usually hooked up to a Sansui 9090db, but its getting ready to get overhauled. Anyway a dedicated pc with a great soundcard containing Burr Brown chipsets can be built very inexpensively. And the sound quality is outstanding. Plus a dedicated media pc offers much more than an iPad hooked up to your receiver or amp..