Is there a pre-amp not processor with a sub out?

I'm creating a class "A" system with a velodyne 18 sub & Ultima Gems, and the position of the sub is too far away from the preamp to be cost effective (Running interconnects from the preamp to the sub and then back to the amp) and I won't use speaker connections. Is there a class "A" preamp that has the cross-over built into it (subwoofer output)?
Thanks