The thumb rule for Deus reactivity settings is loss of about 2 to 3 inches of depth detection with each increase in reactivity setting (I think this is subject to debate amongst the Deus Jedi but probably not far off - also Silencer plays into to debate as explained below). If you need Rx = 3 to provide separation in a trashy setting, then you will loose about 4 to 5 inches of depth vs. Rx = 1. However, in a really trashy site, the trash is masking really deep signals anyway so its worth the trade-off to be able to separate good targets from the trash at about the same depth. I like Rx = 2 as a good middle of the road Rx setting for most situations and seems to fit with my "default" swing speed (lol). Bump up to 3 if really trashy or lower to 1 if I want to maximize depth. Be aware of the Reactivity/Silencer quirk. Whenever you change Rx setting, Silencer will also change to the default value associated with that Rx setting. I like Silencer = 0 for all situations unless chatter is just unbearable (I would have to have tweaked everything else [e.g., ground notch, frequency shift, sensitivity, Tx power] before I raised the silencer above 0 to quell emi chatter because silencer settings above 0 start impacting depth performance). Others like to run wide open with Silencer off (i.e., Silencer = -1). None of the Silencer default settings associated with any of the Rx settings is 0 or -1. So you need to remember to reset silencer to your preferred setting whenever you change the Reactivity setting. Silencer will stay at that setting until the next time you change Reactivity to something else. Hope that helps.
