Daniel Johnston
Headphoneus Supremus
It would technically be distortion, wouldn't it? Distortion can affect frequency, amplitude and time all at once.
Yes. That is what I've done in my own multichannel system. You can balance response with any kind of speaker. But there's more to it than just response... there's dispersion patterns too. What works well in the mains may not work as well in the rears. I have both directional and broad dispersion in different places for different purposes.
So you essentially "timbre matched" your system. The goal is to have seamless acoustic blending of the speakers. I once tried an all Magnepan home theater. Never could get it to sound right. You could always tell what was coming from the center channel (all dynamic driver) and what was from the maggies (I didn't have the space or money for the maggie center channel at the time). Don't get me started about blending in the sub.
You accomplished timbre matching (I assume) by using different speaker types in different places based on their characteristics with room correction. I did this by sticking with one style of speaker, speaker position and room EQ. If I had the room, I would've used 4 more RF 7 IIs for the surrounds. Mains make great surrounds, overkill, but great.
Unless there is another obscure audiophile definition of timbre matching, we are talking the same idea but with different methods.