Ghost resonance

[ICG]

It's an easy test. Just mute each band and listen for a change in the next.

No. It isn't. Because

1. The page tells it's a phenomenon (if it's a thing anyway) on active filters.
2. The peak in the response is from a port, so there are no xo filters at all. You can easily see it's a bassreflex by the correlation between the bass and the port, at the peak of the port it's parasitic to the bass driver (dip of the bass at exactly the peak of the port) and the driver response rises again below.
3. The page tells the phenomenon appears on steep filters and assumes the slopes are identical (graph; no mention otherwise). Look at the response, the red line drops with 12dB/oct, the green much, much steeper, not in the least symmetrical.
4. The phenomenon said it's the lower and the higher harmonics. Harmonics are multiples of the base frequency. The phenomenon said harmonics of the filter frequency. The xo is at ~290Hz. The peak is at 250Hz. That's definitely not a harmonics.

That said, not even one single criteria of the phenomenon is fulfilled. That, per definition, excludes it multiple times in this case!

Well the real name is sideband distortion, and that seems to be a real phenomenon.

Yes, it is. In high frequency technology in conjunction with a. a carrier and b. much, much steeper filters.

 

[Viper_user]

Ghost resonance finally solved!
Have done a lot of testing lately and went back to this problem, fully audible.

"When you compare the two power responses you'll notice they have the same amount of dip at the crossover frequency but above and below that point the 4th order crossover has a stronger power response."

Power response comparison with Linkwitz-Riley crossovers

! Be sure to flip the polarity of one driver set in the LR2 if testing.