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. This socket allows you connect an external sound source of your choice and can be used for playing backing tracks into your unit. Please not the volume of music/backing track is controlled by the volume on the external sound source itself. Features 15 Driver 7 Band Graphic EQ 165 watts RMS Enhance control Switchable HF On-board Compressor On-board Limiter Specifications Supply Voltage on all Models Factory Preset: ~100V, ~120V, ~220V, ~230V, ~240V, 50/60Hz Mains Fuse: ~100V - Factory fit option ~120V - T3.15A L ~220V, ~230V - T1.6A L Power Consumption: 200W Output Power Rating: 160W Loudspeaker: 15'' Custom Designed Driver + Switchable HF Horn Features: Normal & Hi Inputs Switchable Compressor with Activity Light Switchable Limiter with Status Light Gain Enhance EQ: Bass (±12dB at 40Hz, Shelving) 7 Band Graphic (±15dB at 40, 80, 160, 400, 800, 2K, 6K Peaking) Treble (15dB at 3.5KHz, Shelving) D.I: Balanced XLR Aux In: 3.5mm stereo Tuner Out: 6.3mm mono FX Loop: Yes - (0dBu Nominal) (Series-Insert) Ex. Loudspeaker Socket: 8 Ohms minimum (internal speaker remains connected) Input Impedance: 1M Ohm/100pF Recommended Min Ex Speaker Power: 100W Recommended Richter Ex Cabinet: R115 / R410 Side Handles: Yes - Comfortable Contoured Grip Unit Dimensions 555mm x 485mm x 305mm (HWD) Unit Weight 19.8kg