+1 to all the above. I'm not familiar w/ the interface, but impedence will have a marked effect on the volume of a headphone. And a lot of budget oriented interfaces will, to put it politely, skimp on the power amp for headphones. Combine that with headphones that don't match the power requirements and/or impedence and you get low volume. That shouldn't be a problem if you aren't recording the noise, just hearing it. Bothersome, but shouldn't overly effect your recording quality.
Many ribbon mics are passive, and need a lot of gain from the preamp. Again, many lower cost interfaces don't have a lot of gain in their preamps, and the high side on the gain knob is often almost on/off instead of evenly adjusting the gain level. This makes it doubley hard to get a solid signal. Not much to do about that but get something like a Fethead to use or buy an external preamp.
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