4 OPERATIONUSER MANUALVORTEX 3 QUADROP.204..2 Gain SelectorTwo switches on the rear of the VORTEX allow the maximum amplificationattainable to be set directly in the input stage of each amplifier (A/B, C/D).The VORTEX amplifier has a 26 dB and 32 dB voltage gain setting along with a,4 V sensitivity setting.Model 26 dB 32 dB 1,4 VVORTEX 3 QUADRO 750 W @ 4 Ω450 W @ 8 Ω2,75 V3,0 V,38 V,5 V 32,64 dB4..3 Limiter SwitchThis switch is located at the rear of the VORTEX. It allows you to set the mode ofthe limiter. This limiter affects both channels in both amplifiers. There are threemodes: (See 4.3.1 Clip Limiter and 4.3.4 Speaker Protect Limiter)Right position:Clip Limiter: activeSpeaker Protect: activeMiddle position:Clip Limiter: inactiveSpeaker Protect: activeLeft position:Clip Limiter: inactiveSpeaker Protect: inactive4.2 Indicators4.2. On LEDs (multifunctional)Under normal operation, after the amp has started, the green power LEDs arepermanently lit. A variety of different sequences of flashing LEDs are used toindicate other operating states and errors in one of the channels of the poweramp. (See 6.1 On LED Flashing Sequences)