This is a great article by Steve Herschbach ( Detector Legend ). I have clipped some of it below with a link to the full article on Minelab's website.
I have seen some confusion on the internet regarding the differences between the Minelab EQUINOX 600 and EQUINOX 800. I think that the EQUINOX 600 is being somewhat overlooked because it’s not the “top model” but, in my opinion, it is incredible value for a remarkably low price. I hope this blog will clear up any confusion and, in the process, show why I think the EQUINOX 600 deserves a second look by some people…
The most obvious difference is what comes in the box. The EQUINOX 800 comes with Bluetooth headphones and the WM 08 wireless module, instead of the wired headphones included with the EQUINOX 600; but these options can be added to the EQUINOX 600 if you so desire. In fact, most popular aftermarket Bluetooth headphones will work with both EQUINOX detectors.
Once you ‘get past’ the different audio accessories, the EQUINOX 600 can generally be considered as an EQUINOX 800 with a simplified feature set. The EQUINOX 600 has in no way been ‘watered down’ or de-sensitized. An EQUINOX 600 and EQUINOX 800, set up identically, will have identical performance to each other, under the same conditions.