FL_GuyI don't know but you can take the Schiit audio Jotunheim as a comparison. Take note that they are not the good specs of the amps and they are just informative infos to just gave you an idea.
With just the infos about 50ohms, this amp is let asume '' 7% ''less powerfull in XLR and '' 13% '' less powerfull in SE ( I know this is not how it work, but still... )
So, XLR 4650mW at 32 ohms / 837mW at 300ohms
So, SE 1305mW at 32 ohms / 304.5mW at 300ohms
Schiit Audio Jotunheim specs:
Balanced Headphone Output:
Maximum Power, 16 ohms: 7500mW RMS per channel
Maximum Power, 32 ohms: 5000mW RMS per channel
Maximum Power, 50 ohms: 3000mW RMS per channel
Maximum Power, 300 ohms: 900mW RMS per channel
Maximum Power, 600 ohms: 500mW RMS per channel
Single-Ended Headphone Output:
Maximum Power, 16 ohms: 2500mW RMS per channel
Maximum Power, 32 ohms: 1500mW RMS per channel
Maximum Power, 50 ohms: 800mW RMS per channel
Maximum Power, 300 ohms: 350mW RMS per channel
Maximum Power, 600 ohms: 175mW RMS per channel