>> I would say that HOA start to be usable for focused point source around
> the 5th order, and gets better higher up with > the problems of then having
> the speaker setup to fill it
> 
> This is also very interesting! Can’t Ambisonics be decoded to almost any
> loudspeaker array?

Not optimally. There is an ideal coverage (nb and pos of loudspeakers) that 
would decode optimally each setup. There are a few papers (and threads on this 
list) talking about that.

> Did you find that adding more speakers to an Ambisonics
> system helped as much as increasing the Ambisonic order?

There is, as I said above, an optimal amount of speakers for each order, with 
too many starting to give diminishing return. The real Ambisionic specialists 
on this list will give you the reference I cannot find

> How did you encode
> and decode to 5thorder Ambisonics?

The Paris 8 tools.

> Did you compare to a comparable
> channel-based array?

Always ;-) It is never as sharp as point source. You get something with 5th 
order almost as sharp as the phantom image you get. That’s my experience in the 
3 studios and many live settings I’ve listened them in. Jorn’s experience was 
very useful as I said.

> Another question that came up reading these replies: what is the ideal
> Ambisonics playback system?

Do you mean gear, and/or position, and/or room, and/or decoder ?
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