FractalAudio said: Replaced factory cabinets 54-56 with selected UltraResTM IRs from ML Sound Lab’s “ML Brit 4x12” collection. If you enjoy these IRs you may purchase the entire collection from our online store. Click to expand...

The new IR's are single mic IR's from Cab Pack 20: ML Brit 4x12 Collection.Check it out: http://shop.fractalaudio.com/Cab_Pack_20_ML_Brit_4x12_Collection_p/fas-801-0020.htm The PR55 is in Cliff's opinion my best cab.The PR75 is in my opinion my best cab.Have fun trying these out and I can admit they are intentional teasers and maybe the best stock IR's in your unit. If you really like them I strongly suggest you get the full pack. These are only 4 of the 1775 IR's included in the pack. That's almost 5 years using a different IR every day.