Any advantage using 4 monoblocks?

Does anyone know the advantage of using 4 mono blocks to run speakers over the convential two mono blocks,or would it be better to run them in bi amp form as the amps can be run as stereo amps? I tried all the configurations and to be honest cant really tell any difference just looks nice with four amps sitting there.  It does seem a waste to use two amps on a little HF Unit.

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