Relaxs man, our friend just don't know sometimes... Learning path are great, most of the time....

I am on the learning path boss. You walked the learning path before as well, aren't you?
That's why I need people to guide me. Would you mind to share more information about this topic?

From my noob point of view, getting lower tolerence value will be good, say +-5%, when you buy a batch of capacitors say value of 100uf, it can only be either 95uf or 105uf..... Anything more than that consider off spec.... If you are getting caps with tolerence level of +-20%, it will be 80uf or 120uf.....
Just imagine you use this batch for your amp's output where 1 side 80uf and another 120uf, what will happen?
That's why you can see why certain amp that are super expensive, that's because they need to match a pair(extra manhours)... Or another good example are the performance RAM vs value RAM, every spec are the same but price are totally different....

i using 4 channel 4x75watts amp to push my front ,a 2 channel AB push my sub SVC,should i find another pair of speaker to put at rear,so the 4 channel can be more powerful when 2 pair using by it..???or i just doing to nothing just let the 4 channel push the front?can bridge it?i mean at the front