Jmagee, I do not believe that Audyssey corrects for timber. However, the speakers in our delivery use yellow drivers (4102) and black drivers (4881) and they timber match to my satisfaction. YMMV and this is only heuristic when it comes to predicting timber matching with the 8” in-walls.
I want to correct a detail I failed to mention in my box design numbers before. Those boxes were designed using heavy internal stuffing. Changing the stuffing has a measurable impact on the response.
We decided not to construct boxes for the 4881's due to surprises behind the drywall and satisfactory response during test fitting. Cheif among the reasons to not build boxes was that audio contamination of other rooms was negligible in our test fitting trial.
I have composed 6 different box designs for PID 4102. Boxes 1 and 2 are designed for maximum output at the lower end, with no versus heavy stuffing. Boxes 3 and 4 are designed for maximum fidelity, with no versus heavy stuffing. Boxes 5 and 6 were designed for a target F3 of 85Hz. This was not possible with heavy or even medium stuffing, so they use no versus minimal stuffing.
The response boosts in Boxes 1 and 2 occur at too high of frequencies to be desirable. Boxes 1, 2, and 4 have F3’s above 99Hz. These are not desirable since home theatre low frequency crossovers occur around 80Hz (typically).
Boxes 3, 5, and 6 have virtually identical response graphs. Their F3’s are 84.6 Hz for box 3, and 85Hz for boxes 5 and 6. Their stuffing is none or minimal. Their volumes range from 10.45 L to 12.7 L. So you can see that they are fairly similar boxes. Our chosen box will be box design 3, or something reasonably close to it.