Preamp with two volume controls?

Anyone familiar with a preamp that has 2 volume controls. Currently I use 2 Mcintosh C50 preamps in my system. One is for the 2 MC252 amps and 1 used as a volume control for my 3 SVS subs and an Anthem STR amp. The extreme differences in how bass is recorded in new verses old recordings and the wide range in low frequency mastering in the many styles of music I listen to has led me to look for different ways to rectify these issues. What I am doing works pretty well, but I would love to have a more direct method. Thanks in advance.