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In the Forum: Horn-Loaded Speakers
In the Thread: Adding one more spherical to Macondo.
Post Subject: The ordinary honk of the bad horns owners.Posted by Romy the Cat on: 8/20/2006
 hagtech wrote: |
| Interesting. I'm wondering here if this is the key to eliminating the honkiness I hear in most horn installations. From your experiments, it seems that the low frequency extension is key. Push it too far and it honks. Is that correct? |
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Oh, yes, sure. In 80% of all cases people try to push out more LF out of their MF hours. An extra 20-30Hz threw a horn into honk and you are done. Particular it is applicable with light rectangular horns, typical for Altec-JBL-Klipsh-Votavox. The typical rule of sum that a crossover should be one full octave above the horn’s cut off. However, from there is it necessary to look further as frequency at which horn honk has to do with other aspects as well: ugliness of profile, imperfections of expansion, type and quality of cone damping, absolute frequency, amont of front chamber compression relatuve to the air-mass of horn, relative mass of horn to the horn rate and few others...
| hagtech wrote: |
| My guess is that folks often do the math for cutoff frequency and then run the horn too close to that point, or worse, include it in the transition (handoff) to the next driver down. |
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Yes, it calls greed, total luck of any sensibility and total luck of any sensitivity to realty. Do you want me continue with my typical adjectives or they would be predictable? As I always say: audio is not about machinates but about people….
| hagtech wrote: |
| I'm sure everyone here realizes the lower cutoff of a horn is quite abrupt. I'm not sure what function it is, but the slope is steep. That should correspond to some nasty phase shifts. Maybe this is very simple. Push the thing too far and it will honk. Treat it with some respect and don't ask to much, it can sing. |
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Usually horn decays with 2-3 order and when a crossover point hits the horn rate it begin to roll off sharper. The abrupt roll of at my Lover MF horn is die to 3 factors:
1) Own roll off of the horn mouth
2) Second order filet kicks in
3) Own roll off of the driver
Rgs,
Romy the Cat
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