I have had the PowerCab212+ for almost 3 months. The speaker simulations are pretty cool, but the FRFR flat mode is not flat. I've read the manual but I may have missed something.
I have made sure that it the Powercab's mode is set to "Flat", the voicing is set to "FRFR", High and Low cuts are off, and the level is set to 0db. Using both a Helix Floor and Fractal FM9 with presets that sound great through my studio monitors and PA speakers, sound terrible through the Powercab. I am also aware of the Fletcher Munson curve, I've listened with all 3 sets of speakers at varying volume levels, and find the Powercab consistently colors the sound.
I do not have equipment to measure the Powercab's response, but to me It sounds like the Powercab is boosting around 120hz, tapers down to 1k, then cuts from 2k to 5k before it boosts around 7k and cuts back down. I have played around with putting a parametric EQ at the end of my presets to counteract this. With the EQ, I can get it sounding closer to my studio monitors and PA speakers, but not as close as I'd like.
Has anyone found a way to flatten the response more accurately somehow? Possibly with an IR? Is there anything I can do other than playing with an EQ for hours? Any help would be appreciated!
