Dual-Channel Preamps: Single Channel PreampsPreamps are offered in single-, dual-, or multi-channel configurations. A two-channel preamp is obviously desirable for stereo miking techniques. A single-space rackmount unit with eight preamps will offer you major space savings and generally, big bang for the buck, letting you track a complete drum kit, for instance, or plug in an entire instrument-level hardware synth rig. Do you do remote recordings? Multi-channel preamps are also ideal for mobile recording rigs.