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Multi-Way Conventional loudspeakers with crossovers

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Old 20th September 2021, 04:15 AM   #171
hifijim is offline hifijim  United States
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Location: St Louis, MO
So now let’s talk about why the baseline filter and the Sound Power Optimized v7 filter sound so similar on the majority of material. Here is my theory...

Several months ago, I made a room response curve. I used 5 different microphone positions and 2 different speaker positions for a total of 10 separate measurements. The 5 mic positions were spaced out quite a bit further laterally than the normal listening position, at different heights and distances from the speakers. When all 10 curves are averaged together, the result is smooth and even. I show this in the first graphic. The next graphic shows the same thing, but with 1/6 octave smoothing.

The third graphic shows the average room response curve compared to the measured left and right on-axis curves. I was pleased to see the close correlation between the room curve and the on-axis curves.

The fourth graphic compares the average room response curve to the VituixCad2 simulation. My measured room response curve is much closer to the simulated listening window curve than it is to the predicted in-room response or the power response. So, this is the explanation. Since both the baseline filter and the new filter have very similar on-axis responses and listening window responses, they tend to sound very similar in my unique room. Optimizing the sound power response had no effect on my listening experience because in my room, I don’t hear the sound power response.

This is not so surprising in hindsight. In his book, F. Toole discusses how the sound power response is a good indication of how a speaker will sound in an average room, but he acknowledges that every room is different, and some are quite different. Does this make sense? or am I completely dished ?

j.
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Last edited by hifijim; 20th September 2021 at 04:38 AM.
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