Currently, I've got dual SVS's going into a y-splitter on my Ref31.

I've decided to use balanced outputs on the 990. There is only, however, one sub output on the balanced - but there are two unbalanced.

Should I....

1) use balanced cables for everything but the sub and run each sub to its own unbalanced output on the 990

or

2) get a (does this even make sense or exist) XLR y-splitter for the single balanced output on the 990.

Aren't the balanced channels +6db over the unbalanced so the sub would be -6db from everything else if I went unbalanced?

What should I do?