Those things are meant for home cinema. There's minimal DSP processing and even then it's a matter of a couple of milliseconds max.
So latency shouldn't be a problem really. Just check your levels.
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Wut? What do you mean? You mean the processing of the video? Because with the last 3-4 generations of panels that has gone down to very, very low. Take gaming for example. You're talking about something like 30ms from input to output, depending on the panel and the processing. Considering some home cinemas have considerable distance between the speakers, speed of sound also comes in the equation. So i believe that audio has to be low latency even with this kind of products.
AFAIK bose doesn't use anything more than just an eq on most of their range except the ADAPTiQ stuff, which has phase and delay compensation in software. I still don't believe that would add so much latency that he could not do basic mixing (it's his first time, come on, do you think he's going to scratch and cuejuggle? :P)
Also, isn't audio delay a function that can be applied to different speakers placed at different distances from the listener differently to make timing coherent between the speakers?
I'm not familiar with Bose a/v. I'm just saying I've used home theatre equipment that has added enough latency that has made it impossible to mix with one ear in, one ear out, that I've remedied this by changing the a/v to a source direct mode. This has happened on more than one occassion, and I thought it might be of use to the OP.
Well he should be good to go then