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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: Unity design MR freq limits of 1000Hz. posted by freddyi on January 24, 2007 at 15:36:14:
Hi Nicolas, Freddyi, allSorry for the delay.
A number of things conspire to limit the hf response of all drivers and some extra things are added with the Unity and Synergy horn drivers.
As with any horn driver, both moving mass and series inductance impose a roll off slope somewhere.
Additionally, in this configuration as the mysterious V suggested, there is a notch, which is cause by the reflected signal from the closed end of the horn.
When the frequency is high enough so that the total path equals 1 / 2 wl, there is a cancellation notch (and a pattern of cancellation notches repeating above at 180 degree intervals.
The sum of those notches alone produces a roll off of acoustic power above this F, a lumpy acoustic low pass filter..
Lastly, the trapped air volume under each cone, combined with the air mass in each connecting port, form an acoustic low pass filter as well.
These two acoustic low pass filters (unlike electrical series L which is on the pre-acoustic leg) combine to greatly attenuate the inevitable harmonic distortion present in all drivers. Many of the harmonics the driver produces, fall in the range where the low pass filter is, hence they are reduced while the fundamental level is unchanged.
Best,Tom Danley
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Follow Ups
- Re: Unity design MR freq limits of 1000Hz. - tomservo 07:37:14 01/26/07 (0)
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