Hypex finally introduced FIR filters for the Fusion amp range of plate amps. This allows for 4000 taps on the input and 1500 taps each for the outputs. We have FIR capable versions in stock here, you can also upgrade some of the older amps if the hardware revision is new enough, if you get in touch with us we can help steer you so that you can accomplish that. We also have quite a few of the older revision amps in stock that still provide some of the best hardware available in a plate amp even without FIR, there are available at 25% off currently!!