Hi!
Can anyone please give me fair idea of how cone excursion for simultaneous playback of multiple frequency works?
Say a woofer is to play a sine wave of 50Hz requiring 5mm excursion together with a sine wave of 100Hz requiring 3mm excursion for particular SPL levels. When played together, will the woofer need total 8 mm excursion or just 5 mm maximum excursion?
I know real music playback cone excursion requirement is a very complex sum but the answer to this very simple question will let me know the basics.
Thanks.
Can anyone please give me fair idea of how cone excursion for simultaneous playback of multiple frequency works?
Say a woofer is to play a sine wave of 50Hz requiring 5mm excursion together with a sine wave of 100Hz requiring 3mm excursion for particular SPL levels. When played together, will the woofer need total 8 mm excursion or just 5 mm maximum excursion?
I know real music playback cone excursion requirement is a very complex sum but the answer to this very simple question will let me know the basics.
Thanks.
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Does this image help? One rides on the other. BTW, I simply Googled 50Hz wave plus 100Hz wave and this image was the closest.
An externally hosted image should be here but it was not working when we last tested it.
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According to the 'one wave riding another' logic, a woofer would hit x-max pretty early if called upon to play a track with multiple simultaneous sub bass frequencies. However this is not readily noticeable, maybe because usually audio tracks rarely contains simultaneous multiple sub frequencies of same level.
Thanks for your reply.
Thanks for your reply.
the sensation of loudness will mostly correlate with the envelope of the sum of the individual tones for tones in the same critical band - there is just one critical band for everything below 100 Hz
and the relation between SPL and excursion is complicated at frequencies where room modes dominate
and the relation between SPL and excursion is complicated at frequencies where room modes dominate
To reproduce a given SPL at a give frequency the driver cone must move a certain amount. For each octave lower the cone must move 4 times farther. More info here:
SPL vs. Frequency vs driver movement
See post #4 for the exact relationship.
Because of the 4-times dependency of excursion versus frequency, it is mostly the frequencies at the lowest end of the driver's passband that limit the SPL that the driver can produce within it's physical excursion limit. The higher frequencies, say higher than 2 octaves above Fs, can essentially be ignored.
SPL vs. Frequency vs driver movement
See post #4 for the exact relationship.
Because of the 4-times dependency of excursion versus frequency, it is mostly the frequencies at the lowest end of the driver's passband that limit the SPL that the driver can produce within it's physical excursion limit. The higher frequencies, say higher than 2 octaves above Fs, can essentially be ignored.
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