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Bass Amp and power amp question

Use the slave out, should sound great!

You'll have to use two cabs (or a stereo cab) both sides of the 50/50 must have a speaker load on it.
If you choose to run it with one cab follow the instructions from the manual, but user error is easily accomplished this way so I wouldn't recommend it.

From the manual of the 50/50:

SPEAKER OUTPUTS
The Fifty/Fifty provides one 8-ohm and two 4-ohm speaker outputs for each channel. When
using a single 8-ohm speaker or 8-ohm cabinet on a channel, connect the speaker or cabinet
to the 8-ohm jack. If using two 8-ohm speakers (assuming they are wired in parallel) or
cabinets on a channel, plug them both into the 4-ohm jacks. (The logic here is that two 8-ohm
loads connected in parallel add up to a 4-ohm total load). Mismatching of speaker
impedance will not cause damage or severe loss of power. (Extreme mismatches will
decrease tube life, however). If you opt to use only one channel of the Fifty/Fifty with speakers
connected to only one channel's output(s), you must turn the unused channel's Level control
to zero! Otherwise the channel will be operating without a load, and damage to the tubes
and/or the transformer will result.

The M pulse should be fine running without a speaker load.