This was recently perfectly illustrated in a shootout conducted by the excellent UK magazine, Sound On Sound, where they compared the new Avid HD Omni, and original Digidesign 192 IO, a Prism Sound ADA-8XR and a new Apogee Symphony I/O in a blind test.
While there were some differences heard between the interfaces, just about all the people involved admitted that they were splitting hairs to hear them, which I think is a good thing. While this may seem like a recipe for buying the cheapest unit possible the next time an opportunity presents itself, keep in mind that:
1) the sound of your system is culmination of your entire signal chain, not just the converters. Certain gear plays nice better with certain gear than other gear, which means that one unit might just sound better than anything else.
2) the feature set of each unit has now become more important than the sound quality, if they're all pretty much in the same audio quality ballpark.
3) you can still use the same components in different interfaces, but the way they're used can make a big difference. For instance, a bigger, better designed power supply with allow the unit to provide more headroom before distortion.
4) converters might not mean that much to your setup if you're mixing in the box.
Ten years ago convertors made a huge difference; today not as much. For once, quality gets better as time marches on.
Read the entire Sound On Sound article here.
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