Quick Answer: A metal detector’s core settings — sensitivity, discrimination, ground balance, and recovery speed — each control a different tradeoff, not a single “best” number. Run sensitivity as high as your ground allows without falsing (on a Garrett ACE 300, that’s commonly 4-5 bars out of 8 in normal soil); keep discrimination low-to-moderate so you don’t silently skip real targets; ground balance whenever the soil type changes; and raise recovery speed, which Minelab’s Equinox 900 scales from 1 to 8, only in trash-dense sites where targets are packed close together. Factory defaults are a fine starting point for your first few hunts.
If you’ve just unboxed a new detector and the settings menu feels like a wall of unfamiliar dials, you’re not missing anything obvious — every one of these settings is a tradeoff, not a single correct answer, and dialing them in is a skill that comes from time in the field, not from finding the “right” number once and leaving it there.
Why this matters before you buy: a cheap detector with only one or two adjustable settings limits how much you can tune around your local ground — if you’re hunting mineralized soil or salt-sand beaches, a machine with real sensitivity and discrimination range earns its price back in fewer missed targets and less chatter.
Sensitivity: how deep and how sensitive to noise
Sensitivity controls how strongly the detector reacts to a given signal, which affects both maximum depth and how much electrical/mineral noise it picks up along with real targets. The general rule across the hobby is to run sensitivity as high as the ground allows without falsing — falsing means random chirps and signals with no actual target underneath, usually caused by mineralized soil or nearby power lines. On a Garrett ACE 300, most detectorists find their machine performs most stably around 4-5 bars out of 8 in ordinary park or lawn soil; wet salt sand and highly mineralized fields typically call for dropping several bars lower to stop constant false signals.
| Ground condition | Typical sensitivity approach | Why |
|---|---|---|
| Normal park/lawn soil | Moderate-high (e.g. 4-5/8 on ACE 300) | Low mineral interference, room to push for extra depth |
| Highly mineralized ground | Lower than normal | High sensitivity reads mineral content as false signals |
| Wet salt sand / surf | Reduced, paired with discrimination | Salt water conducts and amplifies noise |
| Near power lines/fences | Reduced | Electrical interference triggers chatter at high sensitivity |
Discrimination: the tradeoff between less trash and missed gold
Discrimination rejects a range of target IDs, most commonly to skip iron and foil. Our target ID numbers guide breaks down what those 0-99 and VDI numbers actually mean — the setting matters here because discrimination doesn’t reject “junk,” it rejects a numeric range, and real targets like gold jewelry and worn coins often share that same range with foil and pull tabs. As our foil guide covers in detail, cranking discrimination up to silence foil means silently walking past gold sitting in the exact same 40s-60s VDI band. Most experienced detectorists keep discrimination low-to-moderate and accept some extra digging rather than risk skipping a real target they’ll never know they missed.
Garrett ACE 300 — Best Beginner Machine for Learning Settings Hands-On
- Eight sensitivity levels give room to tune around real ground conditions instead of a single fixed setting.
- Four iron discrimination segments plus an adjustable notch let you shape which part of the mid-range you reject, rather than an all-or-nothing filter.
- Full spec breakdown in our Garrett ACE 300 review.
Waiting on a new machine to arrive before you can start practicing these settings for real? Try Kindle Unlimited free and read up on target ID charts and site research while you wait for it to ship.
Ground balance: cancels the dirt, not the target
Ground balance tells the detector to ignore the background signal produced by minerals in the soil itself, mainly iron oxide, so the ground doesn’t read as a constant target. Our ground balance guide covers the full mechanics of how auto, manual, and tracking balance differ across brands. In practice, you don’t need to rebalance every few minutes — one balance at the start of a session is usually enough as long as you’re staying on the same type of ground. Moving from dry park soil to wet beach sand, or into a newly mineralized field, is the trigger to rebalance, since each ground type produces a different baseline signal.
Recovery speed: separating close targets vs. chasing extra depth
Recovery speed controls how quickly a detector can process and separate two targets sitting close together underground. Minelab’s own published documentation for the Equinox 900 puts its recovery speed scale at 1 to 8, with the Equinox 600 offering only 3 speed levels by comparison — higher numbers are built for trash-dense sites like old homesteads or heavily-hunted parks where targets are often stacked close together, while lower numbers trade that separation ability for extra depth on sparse, clean ground. There’s no universal “correct” number; it’s a direct tradeoff between depth and target separation that depends entirely on how cluttered your specific site is.
Start with factory defaults, then change one setting at a time
For your first few outings, factory default presets — often labeled “Coins” or general-purpose — are tuned for average conditions and are a genuinely fine place to start. Our beginner’s guide covers the fundamentals of reading tones and target IDs before you start second-guessing every dial. Once you’ve logged real time in the field, change one setting at a time rather than several at once — that’s the only way to know which change actually improved (or hurt) what you’re hearing and seeing on screen.
The bottom line
Sensitivity, discrimination, ground balance, and recovery speed each trade one thing for another, not a single “best” number to memorize. Run sensitivity as high as your ground allows without falsing (commonly 4-5 bars on a Garrett ACE 300 in normal soil), keep discrimination low-to-moderate so real targets don’t get silently filtered out with the junk, ground balance whenever the soil type changes, and raise recovery speed — Minelab scales the Equinox 900 from 1 to 8 — only when you’re hunting a trash-dense site. Start with factory defaults, change one setting at a time, and the numbers that work for your specific ground will become obvious faster than any generic chart can tell you. Once you’ve got settings dialed in, the next skill is knowing what you actually dug up — our metal detecting finds guide covers identifying, cleaning (or not), and valuing what comes out of the ground.