Integra DHC 80.1 and W4S STP/SE not enough XLR's

Do you have any suggestion to connect my new Bryston BDP1/BDA1 combo and my Oppo 95 to my W4S preamp that has only 2 XLR inputs, and I currently using one for the HT Bypass?
Tried to use the RCA's for the bypass, but a lot of hum came from the speakers...
Thanks.