Erik wrote:
"don’t most listening rooms have too long of an RT 60 to begin with, not to mention, it is usually pretty uneven.’
In general when we move into a larger listening room the RT60 will correspondingly tend to be longer, but the larger room STILL sounds better! So clearly RT60 is NOT telling us the whole story.
Making the RT60 more EVEN is of course desirable, BUT I have a question about the unevenness you mention: Is it based on measurements using loudspeakers whose off-axis energy is uneven? If so, is that uneven off-axis energy what’s showing up as "uneven decay"? If that’s the case, then the problem originates with the speakers, not the room.
The problem with a room acoustic approach which focuses on RT60 is that it does not target those reflections which are most likely to be detrimental (the early ones), but instead tends to have a heightened effect on the beneficial later reflections ("beneficial" assuming we’re talking about spectrally-correct reflections). This is because the early reflections will only be attenuated by the absorptive material ONE time, while the later reflections will bounce around the room enough that they may well strike the absorptive material MULTIPLE times, especially if there is a lot of it.
Imo minimizing detrimental early reflections is best accomplished by loudspeaker design and set-up, and if we still need to address the in-room decay smoothness, we can do so without the additional challenge of trying to compensate for the speaker’s uneven off-axis response.
Duke
"don’t most listening rooms have too long of an RT 60 to begin with, not to mention, it is usually pretty uneven.’
In general when we move into a larger listening room the RT60 will correspondingly tend to be longer, but the larger room STILL sounds better! So clearly RT60 is NOT telling us the whole story.
Making the RT60 more EVEN is of course desirable, BUT I have a question about the unevenness you mention: Is it based on measurements using loudspeakers whose off-axis energy is uneven? If so, is that uneven off-axis energy what’s showing up as "uneven decay"? If that’s the case, then the problem originates with the speakers, not the room.
The problem with a room acoustic approach which focuses on RT60 is that it does not target those reflections which are most likely to be detrimental (the early ones), but instead tends to have a heightened effect on the beneficial later reflections ("beneficial" assuming we’re talking about spectrally-correct reflections). This is because the early reflections will only be attenuated by the absorptive material ONE time, while the later reflections will bounce around the room enough that they may well strike the absorptive material MULTIPLE times, especially if there is a lot of it.
Imo minimizing detrimental early reflections is best accomplished by loudspeaker design and set-up, and if we still need to address the in-room decay smoothness, we can do so without the additional challenge of trying to compensate for the speaker’s uneven off-axis response.
Duke