I've two different devices, a first one with s/pdif (optical) output and a second one with simple mini-jack 3.5 output. I want to 'mix' sound from both of them and make output for simple headphones. The actual problem is that I'm not sure how to get it done. I will try to describe couple solutions imho should work, but due to my poor experience I'm not sure what to choose. Help me please. So:
Behringer MX400 + s/pdif to analog converter + cable (3.5 - 6.35). I don't actually like the idea with this converter, and I prefer all-in-one solution.
External audio card, like NI Komplete 6 (this card has s/pdif input (but digital)). I'm not sure this will work without PC. And this card require USB power, maybe I can use USB 'travel adapter' instead?
DJ mixer. Sounds good but models with s/pdif inputs are extremely expensive and hard to find.
AV-receiver. I'm not sure will it work the way I want, but it has s/pdif inputs as well as analog LR inputs. It also has headphone output. But will it 'mix' sound from 2 inputs or I just have to choose one?
Or headphone amplifier like FiiO E17 with s/pdif and 3.5 input. But I'm not even sure will it output from 2 inputs simultaneously.
What solution can you suggest to me please.
Thank you for any advice.