Im still using an 11" LF coil. Im assuming these coils are a big step up? Help me justify the purchase please.
LF Legacy vs. new LF X35 XP Deus Coils
It is always hard to justify spending an additional $400 for a new XP coil so I will not try to do that but just denote the differences between the new X35 coil and the legacy LF coils.
Legacy LF coils had some disadvantages from the get go related to restrictions on frequency coverage and transmit power. Specifically the legacy coils can operate at 4 discrete frequencies - 4 khz, 8 khz, 12 khz, and 18 khz. You can shift frequencies from those base frequencies a bit (+/-200 HZ or so) but if you do shift frequency, then transmit power is locked at TX 2. 4 Khz cannot be frequency shifted at all and TX power is locked at TX 3 which could be a bad thing with a low coil battery (will deplete faster at TX 3), in high EMI situations or if you are trying to hunt in highly mineralized soil.
By contrast, the X35 coils can operate at 5 base frequencies, 4 khz, 8 khz, 12 khz, 18 khz, and 25 khz. In addition, you can shift frequencies over a wider range 3.7 to 4.4kHz, 7.1 to 8.4kHz, 10.5 to 12.4kHz, 15.2 to 17.8kHz, 23.5 to 27.7kHz compared to the legacy coils and you can adjust TX power for all frequencies (including shifted frequencies) without restriction. In addition the 3.7 to 4.4. kHz frequency range has a selectable Tx power boost mode to enable some potentially added depth performance depending on the target and site conditions. The 25 khz range is what I consider a sweet spot frequency for relic hunting, especially mid-conductive brass buttons. I have predominantly used my HF coil, set at 28 khz, as my go to relic setup until I got an X35 coil, which I am still experimenting with.
I think XP has incorporated some lessons learned from the White HF coils into the x35 coils to make them a little more noise immune than their legacy LF cousins.
Otherwise, the X35's have a similar internal coil battery system like the LF legacy coils, vs. the user replaceable external battery (which hides in the coil lower stem rod) for the HF coils.
The other Ver 5.X software improvements involve an increased number of user parameters that you can now adjust on the wireless headphones without having to use the remote and the new software features improved communications with the wireless pinpointer.
So basically, the X35 coil has the potential for greater maximum detection depth at low frequency vs. the legacy LF coil and adds the relic/gold centric frequency of ~25 khz to the coil.
HTH