2) Yes - I do all cals out of the room from my laptop wirelessly
3) I presume - once power is connect, the preamp lights up. One cable to the 80.3 PC input and one to the mic and you are ready
1 - yes it is a good idea to leave that cable hooked to the 80.3. It will make it much easier to connect up when you run Pro again (and you will run Pro again :))
2 - theoretically wireless is good and will work, but I have never trusted it personally for a calibration. One dropout for one second and you could ruin the cal and have to start over. And as it can take up to 2 hours to do a 12 point cal, you don't want to have to do it twice. I dug out an old router from my 'retired gear' closet and have permanently wired it to my 5509, so all I need to do to run a calibration is connect that router to my laptop. The router doesn’t need an Internet connection or a wireless connection or anything - all it does is act as a link between the laptop and the prepro.
3 - yes - one connection is the mic, the second is to the 80.3 and the other is for the power jack from the supplied PSU. When you plug the preamp into the power, an orange light illuminates and you are good to go.
Not at all a PITA - it's not all that intuitive and the Audyssey instructions are hopeless. Note that the in-app instructions cannot be relied on - as it says in the FAQ, they tell you to connect the Onkyo 5509 via the PC input but in fact it needs the AUX input.
Good luck. Be sure to come back and tell us how you get on. BTW, do you have any independent measuring gear, such as REW or OmniMic?
EDIT: If you can tell me what wasn't clear in the FAQ answer you refer to, or what else you think should be added, (eg the wireless thing) I will be happy to amend appropriately - thanks.
Roger that... I will amend that FAQ answer to make it more clear. Thanks for the heads-up.
WRT to that, take a look at this post and see what happened to one guy when the cal was interrupted unpredictably...
I'm using the DHC 80.2 with the Oppo 95. The biggest differences between using Audyessy and Direct with music to my ears are the mid range comp of Audyessy which I don't like but the bass is superior with Audyessy engaged. I've recently picked up the Audyessy Pro Kit but haven't really had any time to play around with it yet. Some may find the benefits of Audyessy outweigh the benefits of the better analog stage in the Oppo, I'm still undecided.