Just getting a QSC RMX 1450 amplifier to power my Ampeg SVT IIP preamp, I am wondering what the best settings are for proper operation. It will be pushing an Ampeg SVT 410HLF or an Ampeg SVT 810E (both 4 ohm). Best DIP switch settings ? Stereo, parallel or bridged mode ? XLR or jack connections from preamp to amp ? Thanks for your answers !