Do you know if Academy of Ancient Music records in studio?
No, I don’t know. As they are based at Cambridge University, I would think they often record there because there are potentially numerous rooms appropriate for recording.
Wonder if it's ever preferable to have period instruments in another venue (or if not if your placement of microphone is closer)?
Preferable to whom? For the recording engineers, probably not but for the ensemble it’s probably preferable to use a room of the period or earlier. Period instruments were designed for relatively small rooms or churches. Orchestras were really just medium or large ensembles at that time, typically only a dozen or so musicians in the early baroque period but up to as much as 40 by the end of the classical period.
Again, I don’t have much experience with period instrument recordings but I would guess mic usage is broadly similar to modern orchestra recording, although the old questions of “what do we want to and up with and how do we want to get there?” is very relevant. So, we could use either a very well placed array over the orch plus some room mics or the same thing but with additional spot mic’ing, although the former would likely be preferable in many cases.
When you're mixing for period instruments, do you try to add in reverb/delay to give a sense of acoustics?
There was quite a vociferous argument raging when I was a music student (and later) between those who were fairly hardline/fanatical about period instruments and those who argued that not enough was known about performance styles and other factors (such as tunings for instance) of the period to justify strict adherence to period instruments/practices. The Academy of Ancient Music was at the forefront of that argument (on the hardline side) and assuming that’s still the case, I would guess they’re philosophically opposed to the idea of studio recordings with artificial reverb, etc. Although, Air Lyndhurst is one of the top two or three studios in the UK and is a converted church so probably would be acceptable.
Modern convolution reverbs would be a potential option along with more emphasis towards spot mics, especially with a custom recorded impulse response but might again be a step too far for some. Again though, I have little experience working with period musicians and what I do have was many years ago, before the existence of modern convolution verbs, so I don’t know the current attitude towards this type of production.
Incidentally, we wouldn’t use delay in orchestral/classical music recording to “give a sense of acoustics”, although we might delay certain mics due to timing differences or to give a sense of a larger acoustic space when applied to some of the room/ambience mics.
G