Hello !
The comparison analysis between dipole and monopole bass loudspeakers in a small listening room continues !
I give emphasis on temporal fidelity of the reproduced signal. Real music signal contains time domain energy variations that must be reproduced accourately before high fidelity is achieved. This is also true for bass.
Temporal variations are best seen in the time varying envelope. I created modulated wavelet for this purpose. (Inspired by Linkwitz Dipole vs Monopole woofer)
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/modulation3_wavelet5_50Hz_ideal.PNG[/IMGDEAD]
In the time-frequency domain it looks like this for ideal impulse response (20Hz-100Hz, 40dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/ideal-impulse_modulation3_wavelet5_20-100Hz_40dB.PNG[/IMGDEAD]
Then I measured monopole and dipole bass loudspeakers in a small room at the listening position. Here are the results.
Monopole (normalised, 40dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/100-1_2m5_modulation3_wavelet5_20-100Hz_norm40dB.PNG[/IMGDEAD]
Dipole (normalised, 40dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/Vuage1-Hbasso_2m5_modulation3_wavelet5_20-100Hz_norm40dB.PNG[/IMGDEAD]
Ideal impulse response (10dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/ideal-impulse_modulation3_wavelet5_20-100Hz_10dB.PNG[/IMGDEAD]
Monopole (normalised, 10dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/100-1_2m5_modulation3_wavelet5_20-100Hz_norm10dB.PNG[/IMGDEAD]
Dipole (normalised, 10dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/Vuage1-Hbasso_2m5_modulation3_wavelet5_20-100Hz_norm10dB.PNG[/IMGDEAD]
It appears that in a small room a dipole is superior over a monopole in it's ability to reproduce temporal finesse at bass frequencies.
Full report:
http://dl.dropbox.com/u/2400456/html/Elias_Pekonen/main.html
- Elias
The comparison analysis between dipole and monopole bass loudspeakers in a small listening room continues !
I give emphasis on temporal fidelity of the reproduced signal. Real music signal contains time domain energy variations that must be reproduced accourately before high fidelity is achieved. This is also true for bass.
Temporal variations are best seen in the time varying envelope. I created modulated wavelet for this purpose. (Inspired by Linkwitz Dipole vs Monopole woofer)
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/modulation3_wavelet5_50Hz_ideal.PNG[/IMGDEAD]
In the time-frequency domain it looks like this for ideal impulse response (20Hz-100Hz, 40dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/ideal-impulse_modulation3_wavelet5_20-100Hz_40dB.PNG[/IMGDEAD]
Then I measured monopole and dipole bass loudspeakers in a small room at the listening position. Here are the results.
Monopole (normalised, 40dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/100-1_2m5_modulation3_wavelet5_20-100Hz_norm40dB.PNG[/IMGDEAD]
Dipole (normalised, 40dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/Vuage1-Hbasso_2m5_modulation3_wavelet5_20-100Hz_norm40dB.PNG[/IMGDEAD]
Ideal impulse response (10dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/ideal-impulse_modulation3_wavelet5_20-100Hz_10dB.PNG[/IMGDEAD]
Monopole (normalised, 10dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/100-1_2m5_modulation3_wavelet5_20-100Hz_norm10dB.PNG[/IMGDEAD]
Dipole (normalised, 10dB scale):
[IMGDEAD]http://dl.dropbox.com/u/2400456/diyaudio/Vuage1-Hbasso_2m5_modulation3_wavelet5_20-100Hz_norm10dB.PNG[/IMGDEAD]
It appears that in a small room a dipole is superior over a monopole in it's ability to reproduce temporal finesse at bass frequencies.
Full report:
http://dl.dropbox.com/u/2400456/html/Elias_Pekonen/main.html
- Elias