@joentell Thank you for taking the time to explain it to yet another person on the internet.

Right. For this part the penny seems to have dropped. The core of the theory is that deviations from this ideal speaker will show up in the MLP MMM,

*but not in the room transfer function*. Thus, the RTF is a stable reference, informed by

1) the room, and

2) the MLP, the MMM of which we seek a correction for.

Because the RTF represents the response of an ideal speaker in a given room at a given MLP, and won’t change as long as the room and MLP stay the same, one can view the RTF as the

*ideal response *of

* any speaker *in a given room at a given MLP. Above Schroeder and for all intents and purposes.

With this out of the way, what you propose is a way to find this RTF.

Most interesting.

Why the RTF is also valid reference below Schroeder is still a bit of a mystery to me. A nice one for me to chew on today.