The horn plot from the P-Audio site does not mean much when it is not using the BMS driver as the reference driver.moo wrote:Heres the Horn plot from the P-Audio site:jeffbabcock wrote: Perhaps the P-Audio horn used is not a good candidate.
Here's what you should be seeing in terms of raw HF performance on a 90x75 horn:
http://bmsspeakers.com/fileadmin/bms-da ... curves.jpg
Certainly the typical CD/horn roll off is expected, but not to the extent in the measurements taken. I've measured many good HF drivers and they usually look smoother than this even unprocessed. It is expected that you need to EQ the CD, but this seems extreme, suggesting either contribution of the LF driver in the measurement due to crossover inadequacy, or the PAudio horn not being ideal.
On a related note however, I happened to be looking at the unprocessed response charts of the VTC EL210 line array which happens to use a pair of the BMS in its Paraline HF lens. It seems to have a similar response on the paraline lens as yours does on the P Audio horn. VTC publicly shows the measured electrical response of their DSP, so if you look at the spec sheet for the EL210 you can see the EQ they have applied. That might be a good place to start as a reference. You will see they have applied a very large HF boost on the BMS. Given the efficiency and power handling of the BMS and most other good CD's, you can safely boost quite a bit while still staying within the safe operating range of the driver.
