Garrett ACE 400 Review 2026: Still the Best Dry-Land Park Machine?

Quick Answer: The Garrett ACE 400 ($357.99) is Garrett’s top dry-land park detector — Iron Audio, an adjustable 10 kHz frequency, an 8.5”x11” DD coil, and a 2.9 lb build that reads 0-99 digital target ID across four iron discrimination segments. It costs $88 more than the ACE 300 and $192 less than the AT Pro, and for coin hunting in trashy parks and yards it remains the easiest sub-$400 answer to “what should I buy?” — as long as the ground stays dry.

Garrett’s ACE line has been the on-ramp into this hobby for more American detectorists than any other single product family, and the 400 sits at the top of it. It’s the pick our coin guide and Garrett lineup guide both land on for iron-filled turf, and it shows up as a reference point across nearly every dry-land buying guide on this site. This review checks whether that reputation still holds up against the 300 below it and the AT Pro above it.

Garrett ACE 400 at a glance

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Iron Audio and why it changes what you dig

Most entry-level detectors handle iron one way: silence it and hope the discrimination setting is right. The ACE 400’s Iron Audio does something more useful — it plays the discriminated iron back to you at a distinct low tone instead of cutting it out entirely, so a coin sitting beside a rusted nail sounds like a coin with a nail rather than like nothing at all. Garrett’s own product comparison lists Iron Audio as “No” on the ACE 300 and “Yes” on the ACE 400, and per our coin guide, that single feature accounts for most of the $88 gap between the two models. In iron-littered turf — old home lots, farm edges, anywhere a barn once stood — it’s the difference between digging a target with real confidence and walking past a coin because the discrimination silenced it along with the trash.

10 kHz frequency and the 8.5”x11” DD coil

The ACE 400 steps up from the ACE 300’s 8 kHz to an adjustable 10 kHz, and swaps the 300’s concentric coil for an 8.5”x11” double-D. Both changes matter in the same kind of ground: DD coils handle ground balance and target separation more consistently than concentric designs, especially in mineralized soil, and the higher, adjustable frequency gives a bit more sensitivity to smaller and lower-conductivity targets. Target ID reads 0-99 on Garrett’s digital scale with four dedicated iron discrimination segments — enough resolution to tell a pull tab from a nickel most of the time, though not the 119-segment resolution of pricier multi-frequency machines like the Minelab Equinox 900.

Waterproofing and weight

Here’s the honest caveat: Garrett publishes no waterproof depth rating for the ACE series at all. Dealers describe only the search coil as submersible — the control box is not — which rules out creek edges, wading, and surf-line hunting entirely. That’s the tradeoff for the ACE 400’s light, simple build: at 2.9 lb it’s noticeably easier to swing for a full day than Garrett’s submersible AT Pro or AT Max, both of which run heavier control boxes to house the extra sealing. If wet ground is part of your plan, the Garrett AT Pro (3 m / 10 ft, $549.99) or a Nokta Simplex ULTRA (IP68, 5 m, $299) are the right tools — this one is strictly a dry-land machine.

ACE 400 vs ACE 300: is the extra $88 worth it?

For open lawns and uncomplicated sites, the ACE 300 gives up little — it’s the same beginner- friendly ACE platform underneath. But the moment iron enters the picture, Iron Audio alone justifies the $88 step up, and the DD coil plus higher frequency add real margin in mineralized ground. Our budget rankings cover the ACE 300 and sub-$300 tier in more depth if that’s the deciding factor.

ACE 400 vs AT Pro: do you need the step-up instead?

Garrett’s AT Pro (~$549.99) is fully submersible to 3 m (10 ft), runs a higher 15 kHz, and remains one of the most proven relic machines ever built — real advantages for creek hunting, rivers, and heavily hunted relic sites. But it costs $192 more, weighs more in the hand over a long day, and its extra depth mostly rewards hunters chasing wet or all-terrain ground the ACE 400 was never built for. For dry-land parks and yards, the ACE 400 delivers most of the same coin-hunting result for less — which is exactly why it remains Garrett’s top dry-land seller instead of a machine everyone skips on the way to the AT Pro.

Who should buy the Garrett ACE 400

• Anyone starting out on dry-land sites — parks, schoolyards, and permissioned farmland are exactly what the ACE 400 was built for.
• Coin hunters worried about iron — Iron Audio is the single best reason to pick this over the ACE 300, per our coin guide.
• Hunters who want a light machine — 2.9 lb swings comfortably for a full day without the fatigue heavier submersible machines can cause.
• Not creek or beach hunters — with no published waterproof rating on the control box, the AT Pro or a waterproof machine is the right tool for wet ground.
• Verify the seller before buying. Garrett’s 3-year warranty runs through authorized dealers — check the “Sold by” line on any Amazon listing before checkout.

The bottom line

The Garrett ACE 400 earns its spot as Garrett’s classic dry-land park machine — Iron Audio, an 8.5”x11” DD coil, and a light 2.9 lb build cover coins, relics, and yard hunting without the complexity or cost of an all-terrain machine. Step down to the ACE 300 only if budget is the deciding factor and your ground stays simple, and step up to the AT Pro only once wet or all-terrain ground is genuinely part of your plan. Whichever you own, settle the brand question for good in our Garrett vs Minelab comparison.