
Let's measure the frequency response with pink noise using "Audio Frequency Analyzer" iPhone app.
First, I measured only the main cabinet after sound aging.
It seems to be different above 10 kHz than immediately after assembly, but it may have been slightly off axis when I first measured it. In the low-frequency direction, the peak at 160 Hz seems to have dropped and the damping has become smoother.
Next, I joined the main cabinet and the legs and measured the results:
The 80-100Hz frequency range was increased, and the 50-63Hz frequency range was also slightly increased.
Originally, I thought that the main cabin was designed as a bass reflex and the legs were an extension of the duct, but the main cabin is 1.2L and the legs are about 2.5L, both doubling the volume to 5L, so it seems to be operating as a double bass reflex.
If I assume a double bass reflex, I can roughly calculate fd1=81Hz and fd2=66Hz, but I will have to check the impedance characteristics to see if it is working as it should.
Next, let's change the elevation angle and see how much the high-frequency characteristics change.
With the main cab fixed at the measurement position, the elevation angle is 0°, 15°, 30°, 60°, 90°, and so on. The elevation angle was measured using "ClinoScope - Dynamic Inclinometer and Gyroscope" app.
- Elevation angle: 0 degree

- Elevation angle: 15 degrees

- Elevation angle: 30 degrees

- Elevation angle: 60 degrees

- Elevation angle: 90 degrees

The 15 degrees elevation angle had a flat characteristic. At an elevation angle of 30 degrees, the area around 12 kHz dropped. At 60 degrees and 90 degrees elevation angles, the characteristic gently dropped above 6 kHz.
The unit is probably designed so that this characteristic can be obtained by setting the speakers at a 15 degrees left-right angle. If the distance between the left and right speakers is 120 cm, I should be listening at about 220 cm from the speakers.
Now let's talk about the sound quality.
I had imagined a soft sound like that of ScanSpeak from its appearance, but the response is much faster and tighter than I expected, and the mid-high range is free from muddiness and distortion, probably due to the effect of the 10cm square cab.
The tendency of this SP system is overall sharp sound quality with not much volume on the low-frequency side. The rise and fall of the sound is fast, and the drum snare and guitar picking can be felt realistically.
The baffle area is small, so the center localization of vocals seems to be well contoured. I had underestimated the sound of this unit, but it is quite to my liking. If I had the budget, I would like to use it for the mid-highs of a multi-system.
This upright biped (not walking) type is quite unstable when it is installed with elevation adjustment and leg removal during measurement work.
It would be vulnerable to earthquakes, and from a safety standpoint, it would be better to fix it to the pedestal.
Since there were no boards of appropriate size, I gathered boards of about 300 mm in width and fixed them with wooden screws.


In the future, I will be listening to a variety of different sound sources for sound aging.
.s