Using dual cab blocks with PC+ in Powercab Posted June 28, 2020 Remember though, having the Powercab processing the IR's means you don't need to use a CAB or IR block in your Helix chain, so it saves you DSP utilization that you can then use for other blocks. That's a big benefit once you start doing more complex effects chains. So I would look at it as not just being able to use IRs on it, but also that it gives you the option to offload some of the DSP processing load from your helix. The drawback to this is you need to have the powercab with you as it is processing the IRs. But, for me since I always use my powercab 112+ for a guitar-only monitor at shows, it's not an issue.