If you own a Minelab Manticore, you already know the detector is a beast. But here's the thing most people figure out after a few months: the coil matters more than the settings. You can spend hours tweaking your noise cancel and recovery speed, but if you're running the wrong coil for the ground you're standing on, you're leaving finds behind.
Bigger coils don't always mean more depth — soil mineralization, target size, and your sweep speed matter just as much. For context on what depth claims really look like in the field, see our depth guide.
We've run every Manticore coil through real hunts, not lab tests, and we have strong opinions about when each one earns its place on the shaft. This is the guide we wish someone had given us when the M11 first dropped.
For the universal framework of how to pick a coil regardless of brand, see our search coil selection guide.
The Coil Lineup at a Glance
| Coil | Size | Weight | Best For |
|---|---|---|---|
| M8 | 8 x 5.5" | Lightest | Trashy sites, tight spaces |
| M9 | 9" round | Light | All-around daily driver |
| M11 | 11" DD | Medium | Fields, pastures, depth |
| M15 | 15 x 12" | Heavier | Wide open ground, max depth |
| Coiltek Mythtek 18" | 18" | Heaviest | Large-scale coverage, deep targets |
We also carry the M15 & M8 Bundle, which honestly is the smartest two-coil combo if you're starting from scratch.
M8: The Surgical Instrument
The M8 is the smallest coil in the lineup and the one most people underestimate. At 8 x 5.5 inches, it doesn't cover much ground per swing. That's the point.
Where it dominates:
- Old homestead foundations where nails, can slaw, and iron fragments are packed inches apart
- Tot lots and modern parks that have been hit hard by other detectorists
- Between rocks, along stone walls, and in spots where a larger coil would be bumping obstacles every other swing
What we've noticed in the field: The M8 gives you noticeably sharper target separation than the stock M11. We're talking about pulling silver dimes out of iron nests that the M11 just grunts at. In one test at a 1780s homesite, swapping from the M11 to the M8 on the same grid produced three additional keepers, all masked by adjacent iron on the larger coil.
The honest downside: You'll cover ground slowly. Very slowly. If you're the kind of detectorist who likes to grid entire fields, the M8 will test your patience. It's a specialist tool, not an everyday coil.
Our take: If you hunt colonial sites, iron-infested cellar holes, or any permission where targets are packed tight, the M8 isn't optional. It's essential.
M9: The Coil Most Manticore Users End Up Reaching For
The M9 doesn’t ship with the Manticore—but it’s quickly become the coil most detectorists add first. The 9-inch round DD hits a sweet spot that makes it incredibly versatile across a wide range of conditions.
Where it works best:
- General-purpose hunting at parks, fairgrounds, and school yards
- Wooded sites where you need maneuverability but still want solid coverage
- River and creek hunting where the round shape tracks smoothly over uneven ground
- Beach detecting along the wet sand line
What sets it apart: You’re getting a noticeable bump in depth and coverage over smaller coils like the M8—while still maintaining excellent target separation. The round design also provides a consistent detection footprint, which matters more than most people realize when working uneven terrain.
Field observation: On a mid-19th century schoolhouse site, the M9 consistently hit mid-conductors (large cents, buttons) at 8+ inches that the M8 was seeing closer to 6. But in dense trash around the foundation, the M8 still had the edge. These coils complement each other rather than compete.
Our take: If you want one coil that can handle almost anything, the M9 is hard to beat. It’s the “do-it-all” coil most Manticore users end up relying on.
M11: The Stock Coil That Sets the Standard
The M11 is the stock coil that comes with the Manticore, and unlike many stock coils, it actually earns its place. At 11 inches DD, it offers excellent depth and coverage right out of the box.
Where it shines:
- Open farm fields and pastures where depth matters
- Permission land where covering ground efficiently is key
- Beaches (wet and dry sand) where wider coverage pays off
- Old fairgrounds and picnic groves with moderate trash
The depth advantage: In side-by-side testing, the M11 consistently reaches deeper than the M9—typically around 1 to 2 inches more on coin-sized targets. That may not sound like much, but in hunted-out sites, that extra inch is often where the remaining finds are hiding.
Weight and fatigue: This is where you start to feel the trade-off. After 4–5 hours, the added size and weight become noticeable. If you run it as your primary coil, a bungee or arm support can make a big difference.
Our take: The M11 is a strong all-around performer and an excellent stock coil. If you primarily hunt open areas and want maximum depth and coverage, it absolutely delivers.
M15: Maximum Minelab
The M15 is the big gun in Minelab's own lineup. At 15 x 12 inches, this isn't a coil you casually swing. You commit to it.
Where it belongs:
- Large open fields where coverage speed matters
- Beach hunting on wide, flat stretches (the extra width is a game-changer on wet sand)
- Historical sites with sparse targets spread over large areas
- Deep relic hunting where you're targeting belt plates, cannonballs, and other large items at depth
What the extra size actually gets you: Compared to the M11, you gain roughly another inch of depth on coin-sized targets and significantly more on larger targets. But the real advantage is coverage. You're scanning about 35% more ground per swing than the M11. On a full-day field hunt, that's the difference between covering the permission and running out of daylight halfway through.
The trade-off nobody mentions: Ground noise. The M15 picks up more mineralization because it's reading a larger footprint of ground. On heavily mineralized soil or salt-affected beaches, you may need to increase your ground balance tracking aggressiveness or accept more threshold chatter. This isn't a coil fault; it's physics. More ground under the coil means more ground signal to process.
Our take: The M15 is the right coil for people who hunt big ground and know how to manage their Manticore settings. It's not the right coil for your first hunt or your first Manticore season. Learn the detector on the M9 or M11 first, then graduate to the M15 when you're ready to optimize.
Coiltek Mythtek 18": The Third-Party That Earned Its Place
Here's where this guide departs from the usual Minelab-only rundown. Coiltek's 18-inch Mythtek is the first serious third-party coil for the Manticore, and it does something none of the Minelab coils do: it covers ground that the M15 can't reach.
What Coiltek brought to the table: The Mythtek uses Coiltek's proprietary carbon fiber construction, which keeps the weight surprisingly manageable for an 18-inch coil. It's heavier than the M15, obviously, but not by as much as you'd expect. Coiltek has decades of experience building large coils for Minelab platforms (their GPX and Equinox coils are legendary), and it shows in the build quality.
Where it makes sense:
- Large-scale field hunting where you want to cover the most ground possible
- Deep relic sites where targets are sparse and depth is everything
- Open beaches with wide flat stretches
- Any hunt where you're walking miles and want every swing to count
What we've observed: On an open hayfield with known colonial-era activity, the Mythtek 18" found two buttons and a pewter piece at depths the M15 didn't touch. Granted, this was a two-inch depth advantage on large targets, not a dramatic leap on coin-sized finds. But on a site that had been hit by multiple Manticore users already, those extra two inches were the difference between finds and going home empty.
The reality check: This is a specialty coil. The 18-inch size is built for specific conditions, not everyday use. It requires strength and stamina to run effectively, even with support gear. If you’re not fully comfortable with the M15, stepping up to this coil may be more than you need.
Our take: This is the coil for experienced Manticore operators who've hunted out their sites with the M15 and want to squeeze out the last remaining deep targets. It's also the best option for large-scale agricultural field hunting where time-per-acre matters. The fact that a third-party manufacturer beat Minelab to the 18-inch punch says something about Coiltek's commitment to this platform.
Which Minelab Manticore Coil Should You Buy First?
If you're staring at this lineup wondering where to start, here's our honest recommendation based on what we see customers come back and tell us:
If you own the Manticore with the stock M9:
- Buy the M9 first. Best value in the lineup, biggest depth improvement relative to cost, and versatile enough to be your daily driver on 80% of sites.
- Buy the M8 second. Once you start hunting sites with iron, you'll understand immediately why this coil exists.
- Consider the M15 & M8 Bundle if you want to skip ahead. The bundle saves you money and gives you both extremes of the range.
If you only hunt one type of site:
- Trashy colonial sites: M8, no question
- Mixed parks and woods: M9 (you already have it, spend the money elsewhere)
- Open fields and pastures: M11 or M15 depending on how big the fields are
- Beach only: M11 for most people, M15 if you hunt wide flat beaches
- Deep relic/large sites: M15 or Mythtek 18" if you have the experience
Coil Care and Maintenance for Minelab Metal Detector Users
Every coil we sell comes with a skid plate, and we strongly recommend using one. We carry covers for the M8, M9, M11, and M15. Rocks, roots, and pavement edges will chew through the bottom of an unprotected coil in a season. A $15 coil cover protects a $200-400 investment.
Also: check your coil bolt periodically. Loose coil connections are the number one cause of erratic behavior that people blame on settings or EMI. Snug the bolt, add a washer set if needed, and you eliminate a common headache.
Final Thoughts
The Manticore coil ecosystem is now mature enough that you can genuinely optimize for any site type. Between Minelab's four official coils and Coiltek's Mythtek, there's no detecting scenario where you're stuck with a compromise.
But the best coil is still the one that's on your detector when you're actually out hunting. Don't wait for the perfect coil to go detecting. Grab what you have, get out there, and let the ground tell you what you need next.
Questions about which coil fits your hunting style? Reach out to us. We've run all of them and we're always happy to talk shop.
Happy hunting.
