Home / Measurements / 8” Visaton AL 200 – SEALED
8” Visaton AL 200 – SEALED
Note: these are only a subset of the measurements available. You can download the ZERØMASS™ Technology Paper and the ZERØMASS Annex–Measurements–8” Visaton AL 200-SEALED to see all measurements done.
Amplitude
A sealed 8” Visaton AL 200 drivers’ Amplitude vs Frequency response without and with the ZERØMASS™ technology measured with a WenglorMEL laser. We cut it at 200Hz because above 200Hz the excursion of this driver is so small that it can´t be measured with accuracy with this laser model. Lasers’ measurements are known to be more accurate than microphone’s. Input voltage: 2,83V emulating 90dB, 1W @1 meter. Note: from the displacement measurements provided by the laser, a calculation is made to obtain the cone’s acceleration; then another calculus follows to obtain the dB@1m.
Phase
A sealed 8” Visaton AL 200 driver’s Phase vs Frequency response without and with the ZERØMASS™ technology measured with a laser (20mm model). Input voltage: 2,83V emulating 90dB, 1W @1 meter. We cut it at 200Hz because this laser model can´t measure with accuracy beyond this point.
Waveform integrity/distortion
Triangular Waves
A sealed 8” Visaton AL 200 driver reproducing Triangular waves at different frequencies without and with the ZERØMASS™ technology. Measured indoors with a Microphone in the near field.
Red: input signal – Blue: output signal
(High resolution images. They can be zoomed in for closer detail)
Sine Waves
A sealed 8” Visaton AL 200 driver reproducing Sine waves at different frequencies without and with the ZERØMASS™ technology. Measured indoors with a Microphone in the near field.
Red: input signal – Blue: output signal
(High resolution images. They can be zoomed in for closer detail)
Bipolar “M” waves
A sealed 8” Visaton AL 200 driver reproducing Bipolar “M” waves at different frequencies without and with the ZERØMASS™ technology. Measured indoors with a Microphone in the near field.
Reference is a triangular wave of frequency (f) synchronized at the peaks with a smaller double triangle wave of frequency (6 * f). For example, reference is a 20Hz triangular wave synchronized at the peaks with a smaller 120Hz double triangular wave.
Red: input signal – Blue: output signal
(High resolution images. They can be zoomed in for closer detail)
Square Waves
A sealed 8” Visaton AL 200 driver reproducing square waves of different frequencies, without and with the ZERØMASS™ technology. Measured indoors with a Microphone in the near field.
Red: input signal – Blue: output signal
(High resolution images. They can be zoomed in for closer detail)
Excursion
Drivers’ excursion vs Frequency of a sealed 8” Visaton AL 200 driver without and with ZERØMASS™, measured with a laser. Input voltage: 2,83V emulating 90dB, 1W @1 meter. ZERØMASS™ gets the extra excursion needed to get 90db SPL at lower frequencies while keeping zero-phase.
Here is the free-air 8” Visaton AL 200 Excursion for comparison:
Drivers’ excursion vs Frequency of a free-air 8” Visaton AL 200 driver without and with the ZERØMASS™ technology. We can see ZERØMASS™ gets the same extra excursion needed in both cases, in free-air and sealed, while the non-corrected driver excursion is even shorter when sealed (than in free-air).
Power consumption
A sealed 8” Visaton AL 200 driver’s Power consumption vs Frequency without and with the ZERØMASS™ technology. Input voltage: 2,83V emulating 90dB, 1W @1 meter.
Here is the free-air 8” Visaton AL 200 power consumption for comparison:
A free-air 8” Visaton AL 200 driver’s Power consumption vs Frequency without and with the ZERØMASS™ technology. Input voltage: 2,83V emulating 90dB, 1W @1 meter.
