Bonsoir Pascal,
La revue Voice-coil est une revue extrêmement sérieuse avec des mesures de type Klippel également.
Il est vrai que je n'ai pas mentionné comment étais effectué les mesures j'en suis désolé !
En voici la méthode :
Wavecor WF120BD04:
Wavecor woofer was mounted rigidly in free- air, and the SPL set to 94dB at 1m (10.6V) using a noise stimulus, and then the distortion measured with the Listen Inc. microphone placed 10cm from the dust cap. This pro- duced the distortion curves shown in Fig. 30. I then used SoundCheck to get a 2.83V/1m impulse response for this driver and imported the data into Listen Inc.’s SoundMap Time/Frequency software. The resulting CSD waterfall plot is given in Fig. 31 and the Wigner-Ville (for its better low- frequency performance) plot in Fig. 32. For more on this well-crafted driver, visit www.wavecor.com.
Scan-Speaks 12MU/473100:
For the last body of testing on the Scan-Speak 12MU midrange, I used the Listen, Inc. SoundCheck analyzer (courtesy of Listen, Inc.) and the SCM microphone and power supply to measure distortion and generate time-frequency plots. Setting up for the distortion measurement consisted of mounting the woofer rigidly in free-air, and the SPL set to 94 dB at 1 m (4.8 V) using a noise stimulus (SoundCheck has a software generator and SPL meter as two of its utilities), and then the distortion measured with the SCM microphone placed 10 cm from the phase plug. This pro- duced the distortion curves shown in Figure 14.
For the last test on the Scan 12MU, I used the SoundCheck analyzer to get a 2.83 V/1 m impulse response for this driver and imported the data into Listen, Inc.’s SoundMap Time/Frequency software. The resulting CSD waterfall plot is given in Figure 15 and the Wigner-Ville (for its better low-frequency performance) plot in Figure 16.
What attracts high-end loudspeaker manufacturers to Scan- Speak products is not only their musical sound quality, but the overall precision and consistency that goes along with Scan’s manufacturing culture. It was fun to examine this driver, compare it with data I took nearly two years previously, and end up with the results I expected. For more information, visit the Scan-Speak website at www.scan-speak.dk.
SB Acoustics Satori MR13P-4:
to measure distortion and generate time-frequency plots. Set up for the distortion measurement consisted of mounting the woofer rigidly in free air and setting the SPL to 94 dB at 1 m (3.06 V), using a noise stimulus. (SoundCheck 14 has a software generator and SPL meter as two of its utilities.) Next, I measured the distortion with the Listen microphone placed 10 cm from the dust cap. This produced the distortion curves (now being displayed on a log scale) shown in Figure 15.
Last, I employed the SoundCheck analyzer to get a 2.83 V/1 m impulse response and imported the data into Listen’s SoundMap Time/Frequency software. Figure 16 shows the resulting cumulative spectral decay (CSD) waterfall plot. Figure 17 shows the Wigner-Ville logarithmic surface map plot (used for its better low-frequency performance). After reviewing all the data collected for this transducer, I would conclude that this is a very well-designed midrange, especially given the fact that the design comes from the very capable engineers at Danesian Audio!
Cordialement,
Jérôme
La revue Voice-coil est une revue extrêmement sérieuse avec des mesures de type Klippel également.
Il est vrai que je n'ai pas mentionné comment étais effectué les mesures j'en suis désolé !
En voici la méthode :
Wavecor WF120BD04:
Wavecor woofer was mounted rigidly in free- air, and the SPL set to 94dB at 1m (10.6V) using a noise stimulus, and then the distortion measured with the Listen Inc. microphone placed 10cm from the dust cap. This pro- duced the distortion curves shown in Fig. 30. I then used SoundCheck to get a 2.83V/1m impulse response for this driver and imported the data into Listen Inc.’s SoundMap Time/Frequency software. The resulting CSD waterfall plot is given in Fig. 31 and the Wigner-Ville (for its better low- frequency performance) plot in Fig. 32. For more on this well-crafted driver, visit www.wavecor.com.
Scan-Speaks 12MU/473100:
For the last body of testing on the Scan-Speak 12MU midrange, I used the Listen, Inc. SoundCheck analyzer (courtesy of Listen, Inc.) and the SCM microphone and power supply to measure distortion and generate time-frequency plots. Setting up for the distortion measurement consisted of mounting the woofer rigidly in free-air, and the SPL set to 94 dB at 1 m (4.8 V) using a noise stimulus (SoundCheck has a software generator and SPL meter as two of its utilities), and then the distortion measured with the SCM microphone placed 10 cm from the phase plug. This pro- duced the distortion curves shown in Figure 14.
For the last test on the Scan 12MU, I used the SoundCheck analyzer to get a 2.83 V/1 m impulse response for this driver and imported the data into Listen, Inc.’s SoundMap Time/Frequency software. The resulting CSD waterfall plot is given in Figure 15 and the Wigner-Ville (for its better low-frequency performance) plot in Figure 16.
What attracts high-end loudspeaker manufacturers to Scan- Speak products is not only their musical sound quality, but the overall precision and consistency that goes along with Scan’s manufacturing culture. It was fun to examine this driver, compare it with data I took nearly two years previously, and end up with the results I expected. For more information, visit the Scan-Speak website at www.scan-speak.dk.
SB Acoustics Satori MR13P-4:
to measure distortion and generate time-frequency plots. Set up for the distortion measurement consisted of mounting the woofer rigidly in free air and setting the SPL to 94 dB at 1 m (3.06 V), using a noise stimulus. (SoundCheck 14 has a software generator and SPL meter as two of its utilities.) Next, I measured the distortion with the Listen microphone placed 10 cm from the dust cap. This produced the distortion curves (now being displayed on a log scale) shown in Figure 15.
Last, I employed the SoundCheck analyzer to get a 2.83 V/1 m impulse response and imported the data into Listen’s SoundMap Time/Frequency software. Figure 16 shows the resulting cumulative spectral decay (CSD) waterfall plot. Figure 17 shows the Wigner-Ville logarithmic surface map plot (used for its better low-frequency performance). After reviewing all the data collected for this transducer, I would conclude that this is a very well-designed midrange, especially given the fact that the design comes from the very capable engineers at Danesian Audio!
Cordialement,
Jérôme