As far as having the same guts . . . . . no, they do not have the same guts, altough they share the FBS circuitry, coil and shaft assembly. There are internal differences that make them two seperate detectors.
As far as the detection depth, let me say that I have done <span style="background-color:#ffff00;"><STRONG>EXTENSIVE</STRONG></span> testing comparing signals from various incarnations of the Quattro during the development program along with signals from other detectors including the Explorer II.
There were targets that the Explorer II hit - especially those that were deep in hit ground or trashy areas - that the Quattro was not as deep on. In areas where conditions were not as adverse, the Quattro approached the depth of the Explorer.
Keep in mind that:
<STRONG>1) </STRONG>The Quattro was designed to be an FBS detector that people could use without the perceived programming issues of the Explorer
<STRONG>2) </STRONG>There are options that seasoned Explorer XS / II users have found invaluable that are not on the Quattro
<STRONG>3) </STRONG>Internal differences do not allow the same sensitivity; i.e., '32', as that of the Explorer to be used on the Quattro.
The point of this rambling message is that based on a lot of testing side-by-side on targets that have been in the ground for a long time, the Quattro has excellent detection depth but it does <span style="background-color:#ffff00;"><STRONG>NOT</STRONG></span> exceed the detection depth or options of the Explorer II . . . . . and again, that was never Minelab's intent when they developed the Quattro.
Hope this helps . . .
Andy Sabisch </UL>