Headphones with Stellar Strata

I have the stellar strata and I own balanced headphones. The problem is that the jack is 2.5mm balanced. The stellar manual stated the the amplifier jack input is 1/4 in(6.35mm) I read that you cannot combine a balanced(three rings) with a stereo(two rings) adapter, it will ruin the amplifier. I cannot find a 1/4in. balanced jack adapter anywhere to plug into the 2.5 balanced headphone jack. Anyone here that has solved this problem?