In this thread, I will write detailed amp tone comparisons between my new Helix and old Eleven Rack. I have been through a LOT of modelers and have always favored the lowly 11R as an oft overlooked gem of a unit. It is a very good sounding modeler that feels great and is very easy to dial in. It is not without its limitations, though, and a new Helix arrived at my door about 3 weeks ago. There is a lot to like about the new hotness. How will it stand up to my old flame? We shall see in this thread, but only as it applies to amp tone. Each post will feature a comparison between the 2 units for an amp I actually own (and I own a LOT of amps), so I will be able to compare both to each other and to what I know of the real thing. I will test them with their built-in IRs and a sampling of external IRs from Ownhammer's V4 offerings. I intend to stay pretty close to their matching cabinets so as not to go too far into the weeds, however. OH IRs will be loaded directly into Helix's IR slots for testing. The 11R will be routed through a lightweight VST host (Cantabile) and into NadIR (set to highest resolution) for external IR testing. (NadIR is the most neutral sounding convolver plugin I have found.) I realize this is less than perfect, but it accommodates fast switching back and forth without introducing the weight of a full DAW to handle all the I/O and treat both signals exactly the same. Still, I think it is fair, since it demonstrates the strength of the Helix in its IR hosting and the weakness of the 11R in its need for an external solution. Both units are plugged into a BLA MOTU HD192 PCI424 interface in stereo using their XLR outputs. Monitoring through the PC is zero latency when possible, however when using external IRs with the 11R, latency is measured at a max of only 2.9ms. Monitoring will be accomplished using a pair of Yamaha HS80M 8" studio monitors supplemented by a Yamaha YST-SW305 2x8" subwoofer. These monitors can be described as a better sounding NS-10. In my experience, any mix that sounds good on these monitors will translate well to virtually any other monitoring system without the fatigue caused by the old NS-10s. My home studio's near field listening position is treated and tuned to be as flat as possible. The guitar will be plugged into a Lehle Dual A/B switcher to allow quick switching back and forth between modelers. This is a very transparent switcher that does not add any load to the pickups that I can measure or discern. I may use a variety of guitars, but they will be pretty standard and relate-able. The 3 guitar cords in use will be identical run-of-the-mill Fender cables. I have better cables, but I want to keep it real. Levels will be matched in MOTU's CueMix software and with a Radio Shack SPL meter for good measure. I hate to write this next part. I don't have any plans to record sound clips at this point. That will add a lot of time to the process, and I simply don't have that time. Written descriptions will have to suffice. Sorry. First up is the venerable Marshall JCM800. I will write it up some time tomorrow after having a hell of a good time with it last night.