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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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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: flawwed logic posted by Sam P. on June 29, 2002 at 17:50:08:
Man, I really hate it when someone like Tom, who has a very deep understanding of acoustics, takes the time to explain something and then someone, who either doesn't understand or didn't take the time to think about it, tries to rip his response apart...>Maybe w/ dsp, but a two way horn system aligned per Altec AN-9 does >not exhibit the distance changes as you move from side to side. If >fact, the obvious time differences between your HF and LF drivers do >not exist either:)
With any vertically stacked two-way system you can get time alignment for a plane of points in the horizontal axis. The problem doing that with horns is the differential lengths of the midrange and treble horns means that if you are time aligning in the horizontal axis you have to increase the vertical spacing between horns, thereby increasing the lobing problems in the vertical axis. This is why most multi-way horns don't bother trying to time align.
>Hmmm, conical horns where the driver output is bounced a few times >before exiting also seem to smooth the response...I call >that "cuisinart smoothing" where the myriad of reflections prevent >the undue emphasis or cancelation of any specific frequency. Now >tell me those side entry drivers are not bouincing sound off the >horn sides opposite them...
The sound is not "bouncing" off the side of the walls. The radius of the horn at the midrange entry holes is less than a quarter wave--think pressure propogation, not wave propogation.
>BTW, the posted graph on the unity site showed THD over 1% at 2kHz, >I hope that is not what was considered "midrange distortion 1/10 to >1/100 of any speaker" you measured.
For any given 1" compression driver, the Unity horn will exhibit the same distortion as other 60x60 conical horns above the crossover point. The Unity has lower distortion above the crossover point than horns with a lower cutoff frequency. Below the crossover point, the Unity has FAR less distortion than any 2" compression driver.
>"Because the compression driver and each mid driver are less than >1/4 wavelength apart, there output combines fully and coherently"
>
>Only when they are completely in phase. At 90 apart, they WILL NOT >COMBINE FULLY. Not at 45 apart either.You are missing the point here, he is talking about lobing problems off axis. The Unity does not have lobing problems.
>"Unlike all multi driver multi frequency band speaker systems, there >is no self interference between the various ranges at crossover"
>
>You are in denial here. There are still specific separation >distances between the drivers that are cooperating. In the Altec >4508 enclosures, the 16 inch or so mounting distence causes a dip >around 817 Hz. ANY two woofers installed show the dip. Those same >kind of fixed distances are present in your design, and the laws of >physics would imply that SELF INTERFERENCE must be occuring.They are not present and Tom is not in denial. Your comments (eg. "sound bouncing off walls") make it pretty clear that you don't have a full understanding of the principles of operation. Don't be so stinking rude and do a little homework before you start attacking people. It's posts like this that chase all the true experts like Tom away.
Sincerely, John
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Follow Ups
- Re: flawwed logic - hancock 01:27:18 06/30/02 (0)
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