Do you mean the (infamous) AN-1192 application note from National? It sounds like you did not have the gains matched closely enough - this is the biggest trouble when paralleling. Simply using 1% resistors in the gain network (as AN-1192 says may be used) is not nearly good enough - they need to be matched to at least 0.1%.
I can share the schematic I have for 8 TDA2030s paralleled and bridged if you like?
the LM1875 amp is going to be in my bed room so high power is not a issue.
but is running very hot at normal listening .
I ON the amp without a heatsink and the protection did kick in.
the heat is coming slowly.
"Use an amplifier which can deliver more than your required current."
"Do please explain why?"
chipamps are designed to drive higher impedance, higher efficiency loads.
All the BPA versions are simply a ploy to sell more chipamps for a duty for which they were never designed.
........... btw I prefer the LM1875 cause the sound quality is so much better than the LM3886 and TDA7294 ...............