There are times when installing to many speakers can overpower an amplifier and damage it.
Understanding the wattage available and what tap to set will ensure the performance of those TOA speakers is up to par.

In this case, yes you can connect 4 F-122C speakers to a BG-235.  I would recommend using the 1.5 W tap and that should keep you under the rated 35W available.

 The image above shows what coverage and performance would look like based on a 10’ ceiling.