Two new 18" Offset Horns

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Threw together two new horn designs for the P.Audio E18ELF driver. One is ~1000L and gets around 104 dB/2.83V/m and the other is just over 550L and gets 102 dB/2.83V/m.
 

Attachments

  • E18ELF_Big.jpg
    E18ELF_Big.jpg
    140 KB · Views: 373
  • E18ELF_Big_4P800W.jpg
    E18ELF_Big_4P800W.jpg
    115.8 KB · Views: 358
  • E18ELF_Small.jpg
    E18ELF_Small.jpg
    136.7 KB · Views: 344
  • E18ELF_Small_4P800W.jpg
    E18ELF_Small_4P800W.jpg
    112.1 KB · Views: 337
Interesting you should say that.

I'm not an expert on this, but, at port tuning, a driver almost stops moving (need to shove a lot of power in to get it moving the same amount). 18" speakers get used in ported cabs all the time, and I've never heard of one shredding.
 
Take this high comp ratio scenario and equate it to a 4th order( rear sealed) bandpass box. I see many 12" bandpass boxes built with a 4" port on the front chamber( 6 to 1 ratio). Is the reason the cone doesn't break because of the increased box volume(air compliance) in front of the driver?,as opposed to a smaller compression(front) chamber used on a tapped horn. Or is this still not the same situation?
 
Last edited:
In a BR or BP the pressure have time to equalize and avoid high pressure bumps and vibrations.

In a horn with high CR you can get pockets with high pressure that will flex the cone, uneven loading due to taper will make it worse, this can make it rip. HOM is probably bad for it as well due to it's chessboard standing pattern. Water is a factor that will make it a lot easier to break.
Sort of like an aluminum can. You can stand on it without a problem. But as soon as it flexes or get a ding it will rip and collapse.

That's my theory at least.
 
Over 10:1 compression on an 18" driver? wow, I've gone against the conventional wisdom and have used up to 8:1 on an 8" driver, but never an 18.....

Planning on a cone shredding party?

Compression ratio is only 2:1, so not too worried about any shredding.
Through together some new designs for an Ande LB1560 15" driver to be used in banks of 4.

Volume of 469L all up.
 

Attachments

  • LB1560.jpg
    LB1560.jpg
    135.2 KB · Views: 196
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.