Is dac variable output worse than fixed?

Got new headphones that need more power than my current setup. Was told to get a higher end schiit. The only issue is the l/r output from my dac is variable, and someone suggested that would be bad. The dac cost like 250 so i dont want to trash it if it's not going to actually negatively affect the audio. Could someone illuminate me on whether or not that will be the case if i run an ipod through a certified dac to a schiit via the l/r?

Thanks.