Originally Posted by noah katz
My original intent was to just make the point, seemingly considered rarely, that having a CD speaker does not guarantee that reflections have the same spectral response as the speaker.
The input to the system is the speaker. If you start off with a speaker that has really varying response as opposed to on-axis, you make the problem worse. So in that sense, speaker like M2 "guarantee" that whatever coloration you are getting is less than using speakers with worse off axis response.
The transfer function by the way is time dependent. A single impulse will bounce around the room thousands of times before dying. Those reflections combine with the next set and so on. This is at higher frequencies. Below transition you get interference patterns resulting in room modes. Due to high complexity here, we model the impact of the room two ways:
1. Below transition frequency the measurement of the speaker in the room more or less gives you the effect of the room (the room dominates).
2. Above transition frequencies things get very complicated. Yes you can measure them but this will NOT be what you hear. You have two ears which means each one picks up a different signal. The brain then interprets those signals and delivers the final message. No transfer function of the room can tell you these complicated effects. The answers then reside in the realm of listening tests that instruct us on the effect of various walls. The M2's great response by the way is in this domain. At lower frequencies the room dominates per #1.