FRFR Spec Explanation

[Wizard of Wailing]

    I'm planning on buying a Kemper or Axe Fx III soon.  I'm looking at FRFR speakers and I've seen one that says:  Reference Class:  Absolutely Linear Frequency Response (+1/-2dB).  Then it goes on to say:  80-25,000 HZ (-6dB).  I'm just learning about FRFR, so I don't understand the two different -dB levels listed. If anyone has an explanation I sure would appreciate it.
    While I'm on the topic, I've noticed that with the exchange rate I could get a new powered Kemper (with shipping), from Andertons UK for about $300 less than I would pay for one in the USA.  I'm holding off on my decision for a while though because I'm curious about the cabinet Kemper is planning on releasing.   
    Also, how loud is  the fan is in the Axe FX?

 

[TBurst Std]

The fan in the AXE-FX is very quiet

 

[stratamania]

I would say you need a broader range for FRFR.

Here is a good place to start with the topic regardless of which device you use.

https://wiki.fractalaudio.com/axefx2/index.php?title=Connections_and_levels#Full_Range_Flat_Response_.28FRFR.29