I'm looking to replace a vintage HK 930 twin power amplifier with something that has a sub out. Currently using my PC soundcard center/sub out port for the subwoofer and I'd like like to reclaim that port for center channel use. Having difficulty finding a reasonably powerful stereo amp with a sub out that is adjustable (or has any specs for the crossover at all). Am I better off with a budget Yamaha receiver or is there something from Aiyima/SMSL/etc that would be viable? The only thing thing I can find is the Aiyima A3001.