Is it equal to camp alnico compression drivers behind other divers?
because of the magnetical field??
This gets asked from time to time.
Lets look at the JBL Alinco construction.
The Magnet sits inside a heavy cast iron cup, this cup serves to direct the magnetic field to the outside pole piece. There is very little stray magnetic fields around the cup.
The pole pieces are very thick and focus the magnetic flux into the gap, this is very thigh magnetic circuit, very low flux leakage.
There could be a problem if the one speaker was a ferrite magnet since they do have a leaky magnetic design. And if a ferrite speaker was packed VERY close or touching an Alinco the might be problem. Also the inverse square law applies here, if the magnets a inches apart the flux drops off very fast.