Yes, the amp's manual has a block diagram that shows a built-in 2nd Order HPF, but no details about it are given. [Proprietary?] "2nd Order" means 12dB per octave roll-off. Each incremental increase in the order number adds 6dB to the roll-off, so 3rd order is 18dB/8ve. It
can negate the advantage of some external HPFs.
Lots of other tech specs are discussed in the
Fender Rumble Talks linked on the
Rumble Club Wiki page
(which is linked in my signature).
Fender's patented Delta-Comp Limiter is an adaptive compressor that reacts to your settings and the way you play. It
can negate the necessity for some external compressors.
The "need" for external compression, HPF, and EQ is very subjective, so the answers to these questions are not the same for everybody. Unfortunately, you -need- to try various settings with and without your pedals to determine for yourself if they are really needed any more. See the
Fender Rumble Club TONE POOL linked on the Rumble Club Wiki page for various settings contributed by our members.
Welcome to The Club, and good luck!