I am also thinking of changing R17 to a 50kohm potentiometer such that the amp would have some kind of volume control. Since the value of R17 changes this time, I do not know what value should I use for R19. I did read that they should indeed be equal in order to minimize the DC offset.
And for the Zobel network resistors, I am planning to use a 1W resistor for them, I did measure the power on them and found that they are even barely reaching 50mW, only L1 is reaching 400mW ( I did the test on 20kHz).
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Unity loop gain frequency. It is the frequency at which the loop gain becomes 1. To put it simply, it represents the frequency up to which feedback is applied.
If the phase shift exceeds 180° at that frequency, it will oscillate.
Therefore, it is a metric that should be considered not only for this amplifier, but for all amplifiers with feedback.