Power Conditioners


Not sure if I placed it in the correct topic but here goes. I was just wondering how power conditioners work, as I want to buy one. There are conditioners with only filtered inputs and conditioners with some filtered inputs and some unfiltered. I believe the unfiltered ones are for analogue devices. But why should these go into the unfiltered part? If I buy a power conditioner for example with only filtered inputs, will I not be able to put my class A amp in? Or will it have a negative effect?
sjeesjie
Sooo all devices go into the conditioner and the conditioner itself goes into the surge protector? 
I was thinking of doing this: having two plug outlets with each having a conditioner with built in surge protector. One will be the dirty zone, as per @erik_squires example, the other the clean zone. The clean zone will handle the amplifier, the dirty zone will handle the rest (DAC with wallwart, CD player with grounded cable, record player with wallwart, streamer without grounded cable).
There are two outlets on a normal 15 amp outlet. Use one for the conditioner, maintainer, suppressor and one for just a surge suppressor. Not one into the other. Same outlet (circuit) different plug.

Regards
Maybe I don’t understand how a surge protector works then.. I thought it would only protect the devices that are plugged into the surge protector?
Hi OP
....different input types (filtered vs unfiltered).

on my APC  power conditionner,  ´´  unfiltered  ´´   is for power amp.
or  subwoofer  .  Where a lot of power is immediatly needed.

´´ filtered  ´´  is for pre amp, Dac , blueray,  etc.