It should work fine, but be aware that speaker amps do not always have good headphone jacks. From what I've been able to tell from other related threads (I also have several amps with headphone jacks), the design of the headphone out can be significantly different from amp to amp. There are at least two mainstream ways this is accomplished:
1: The headphone output uses the actual speaker amplifier circuitry but has additional resistors in the path so the headphones are seen as a suitable load for the amplifier. This is (IMO) the best way sonically, and was common on vintage amps (it also allows the amp to drive high-impedance 'phones). Search these forums for "Vintage Marantz" and you will find many people use old amps this way.
2: Separate Op-amp based output stage dedicated to headphones. I prefer all-discrete circuitry, so I dislike this approach - also, driving high impedance loads can be a problem. I think this is more common on newer/surround amps.
Which is your Aurex? You may need to open the case or consult a circuit diagram to tell definitively (often headphone output info/specs are neglected on manufacturer data sheets), but I would recommend hooking it all up and seeing if you like it. Remember, no matter how much we talk here, ultimately the only thing that matters is how much you like what you hear. Let us know how it works!
