Does the BluBOX have a load/resistance?
No. The BluBOX does not represent a load resistance and is completely neutral in terms of impedance and therefore also in terms of sound to the amp or power amplifier. It can be neglected or ignored with regard to the calculation of the resistance to be connected to an output stage.
Delete
Danger!
For operation with a classic tube amplifier, this means that a load resistor (guitar cabinet, load box) must always be connected to the SPEAKER THRU of the BluBOX. See here for more info:
" Is a load resistor necessary when operating the BluBOX on a classic tube amp? "