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The plot above is from Eminence. It shows the Beta 8A extends to 4kHz after which she dies off abruptly.
Fig 1 is my measurement of the Beta 8A in a 24 liters ported box tuned to 58Hz. It is encouraging to see my Beta 8A shares the same bandwidth as in the manufacturer’s specs.
Fig 2 is the Waterfall plot. It recorded a strong artifact at 3kHz and 6kHz.
The Toneburst plot is another view of the Waterfall. In this plot, the z-axis is in cycles. The light blue slices represent the artifacts. We can see a bunch at 3kHz and the next one at 6kHz.
The Spectrogram in Fig 4 is a 2D representation of the Waterfall. In this plot, the Y-axis is in time (msec). We can see a bit of streak at 3.2kHz and 6kHz. What is interesting is a hotspot at 10kHz. All of them are benign because they don’t last more than 2msec.
The Distortion at 1kHz~2kHz (Fig 5) shows about -50dB below the fundamental. It rises slightly at 3.5kHz but is still well managed. Summary From the measurements, the Eminence Beta 8A can easily be crossed between 2.5kHz~3kHz. This makes her a good candidate to match with smaller compression drivers like the Peavey RX14 and the JBL2414. Unless otherwise stated, all measurements were made in Full Space (4 pi) with the mic at 36 ins, tweeter axis. Impulse Window=5ms. No smoothing applied. |
October 28, 2025PRO DRIVERS
