XP Deus II Deus Mono Program: Why Single Frequency Still Matters
The XP Deus II metal detector is famous for its advanced FMF (Fast Multi Frequency) technology, offering exceptional depth, stability, and versatility. Out of the box, it includes a wide range of factory programs that use FMF—except for one notable exception: Program 7, Deus Mono.
While most of the Deus II programs operate on simultaneous multiple frequencies, Deus Mono stands apart by letting you choose a single operating frequency. In many ways, it’s your “get out of jail card” when hunting in difficult conditions.
Why Use Deus Mono?
It’s become popular to say that “single frequency metal detectors are obsolete.” But experienced detectorists know that’s far from the truth. Even with modern multi-frequency machines like the XP Deus II, there are moments when a single frequency setup is the right tool for the job.
Having the Deus Mono program built in means you’re never limited—you can still fine-tune performance when interference or ground conditions make FMF less effective.
Pro Tip: Think of Deus Mono as your backup tool for tough detecting conditions—perfect for when electromagnetic interference (EMI) or iron contamination makes multi-frequency unstable.
Is Deus Mono the Same as Deus I?
Not quite. While both offer selectable single frequencies, the Deus II’s internal design provides additional advantages. Because Deus II’s circuits are built around multi-frequency operation, switching to Deus Mono channels that extra power into single-frequency performance.
This doesn’t necessarily mean dramatically more depth—but it does mean greater sensitivity and signal clarity, giving you an edge when EMI or ground noise are issues.
Selectable Frequency Range
Deus Mono allows you to choose from seven main frequency bands:
4, 7, 13, 17, 25, 32, and 40 kHz
Each band includes seven micro-offsets (for example, 7.1, 7.4, 7.8 kHz). These subtle frequency shifts let you fine-tune your detector to minimize EMI without needing to jump to a new frequency range.
You can also activate the FMF Auto Frequency Scan, which automatically finds the cleanest EMI-free channel within your chosen band—especially useful in areas with power lines or buried cables.
Two Coils in One
Here’s a bonus: the Deus Mono frequency bands cover the same ranges as both the X35 coil and the round HF coil from the original Deus series.
That means with the XP Deus II, you’re essentially getting two coils in one machine—a major value advantage for those who hunt a variety of terrains.
If you’re looking for additional coil options, check out:
Manual Ground Balance
When using Deus Mono, you gain manual control over ground balance using the plus and minus buttons, while still keeping the option for automatic ground grab (pumping).
This flexibility lets you fine-tune performance for mineralized soil or tricky conditions.
When to Use Deus Mono
Deus Mono shines in situations where high EMI or dense iron contamination causes instability in multi-frequency modes. For example:
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Urban or residential areas with underground cables
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Gardens and yards during ring or jewelry recoveries
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Commercial sites with machinery interference
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Ancient sites littered with small iron debris
In these environments, switching to a clean single frequency often means the difference between finding targets—or missing them entirely.
Top Tip: Multi-frequency and single-frequency modes are just different tools. Use the one that performs best in your specific conditions.
What About Depth and Target ID?
In general, Fast Multi Frequency (FMF) offers better overall depth and more consistent Target ID at depth, as it hits targets of various sizes simultaneously. It also handles difficult ground—like wet sand, saltwater, and magnetic soil—much better than single frequency.
However, when EMI or ground feedback make FMF unstable, single frequency can produce cleaner, more stable target responses. The soil conditions always dictate which mode performs best.
Final Thoughts: Why Deus Mono Still Has a Place
The XP Deus II is undoubtedly one of the most advanced detectors available, thanks to its FMF technology. But Deus Mono proves that single frequency metal detecting still has real value.
Think of it as your safety net—ready to deliver stable, focused performance when conditions get tough. Whether you’re searching ancient fields, iron-filled yards, or EMI-heavy areas, Deus Mono is a feature every detectorist will appreciate.
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