FX loops are important as they allow you to add effects to the signal path in a specific place between the pre-amp and the output section on an amplifier. This is where FX loops are important as it allows you to put time-based FX after the distorted pre-amp section. For example, delayed distortion sounds different to distorted delay – try it. Features MP3/Aux in On-board reverb 1 x Extension speaker connection (4 Ohm min) FS2-MINI available as an accessory Independent 3 band EQ Radical XTS tone shaping 120 Watts Clean & Drive Loaded with 2 x 12 HH Drivers Specifications Supply Voltage ~100V, ~120V, ~220V, ~230V, ~240V 50/60Hz Factory Option Mains Fuse ~220V > ~240V = TIA L. ~100V > ~120V = T2A L Power Consumption 220W Output Power Rating 120W Loudspeaker 2 Custom Designed 12'' Drivers Features TEC Tube Emulating Technology XTS eXtreme Tone Shaping (Drive Channel Only) Speaker Socket (Min 8 Ohm Impedance) AUX IN (10K Input Impedance) (Nominal 750mV Input Level) FX Loop (Nominal 750mV Level) Footswitchable - Channel and FX (Footswitch not included) Reverb Yes EQ Both Channels contain separate Passive bass, middle, and treble Input Impedance IMOhm/47pF