APEX C Center channel measurements

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Above is the measured Frequency response for the Apex C. In-room response on-axis is the yellow line and the red line is the off-axis 45 degree horizontal (left to right)

For measurements the speaker was placed 30" off the floor to the center of the tweeter (this would allow for some floor reflections in the measurements). The mic was set at a height of 30" off of the floor at a distance of 65" from the speaker for the on-axis measurement.

The Yellow line was taken on tweeter axis with the mic at 30" from the floor at a distance of 65"

The Red line was taken with the mic moved to 45 degrees off-axis "horizontally"

See the sensitivity across the board slowly falling off. In the midrange area, this is from the 2 midrange drivers over lapping. Notice the small amount of off-axis upper end roll (from the tweeter) of less than 5db at 20k at 45 degrees off-axis.

Below is an in-room off-axis vertical measurement up to 45 degrees (up and down).

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This measurement was done with the speaker in the same location; 30" off of the floor, then moving the mic in a true curve retaining the 65" distance for the 15, 30 and 45 degree off-axis tests.

Notice that the yellow line (on-axis) and red line (15 degrees off-axis vertically) are very flat out past 20k.

The red line shows the measurement at 15 degrees off-axis with the mic over 48" off the floor and 65" from the speaker.

The teal line shows the measurement at 30 degrees off-axis with the mic over 68" off the floor.

The blue line shows the measurement at 45 degrees off-axis with the mic at the ceiling height of 8 feet from the floor.

Both the 30 and 45 degree off-axis vertical measurements really are not even in the real world due to the fact that no one listens to speakers this high or this low. The most important measurement is the off-axis horizontal measurement.

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