Minelab Manticore Coils Guide: M8, M9, M11, M15 + Coiltek

Short answer: keep the stock M11 on your Minelab Manticore for open fields and beaches, add the M9 first if you want one extra coil, add the M8 for iron-packed relic sites, and step up to the M15 or the Coiltek Mythtek 18" only when you hunt big open ground. A smaller coil separates targets in trash; a bigger coil covers more ground and reaches deeper on larger targets.

Here's the thing most Manticore owners figure out after a few months: the coil changes what you find more than most setting tweaks do. You can spend hours on 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 what depth claims really look like in the field, see our depth guide, and for how to pick a coil on any brand, our search coil selection guide.

The Manticore Coil Lineup at a Glance

All four Minelab coils and the Coiltek Mythtek are waterproof to 5 m (16 ft), the same rating as the Manticore itself.

M8: The Coil for Iron-Packed Sites

The M8 is the smallest coil in the Manticore 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. Minelab describes it as built for high-trash areas and difficult terrain.

Where the M8 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 I've noticed in the field: The M8 gives noticeably sharper target separation than the stock M11. In an iron nest where the M11 gives a broken, iffy signal, the M8 often splits the iron from the good target cleanly enough to make the dig call. That's where silver comes out of sites other people have written off.

The honest downside: You'll cover ground slowly. Very slowly. If you like 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 earns its place on the Manticore.

M9: The Best First Add-On Coil for Most Manticore Owners

The base Manticore ships with the M11, not the M9. Minelab also sells Manticore bundles with the M9 added, and it's the coil most of our customers buy first. Minelab lists the M9 as the lightest Manticore coil, and at 366 g with its skidplate it is lighter than the 390 g M8. That makes it the easiest coil on the Manticore to swing all day.

Where the M9 works best:

• General-purpose hunting at parks, fairgrounds and school yards
• Wooded sites, riverbanks and creeks, where the round shape tracks smoothly over uneven ground
• Rocky ground, stone walls and trails, where the M11 keeps bumping obstacles
• Beaches around pier pilings, jetty rocks and crowded swimming areas, and long sessions in the water, where Minelab notes its low profile makes it easy to sweep

What sets the M9 apart: You get a little more reach and coverage than the M8 while keeping good target separation. The round design gives a consistent detection footprint, which matters more than most people realize on uneven ground. In trash, a clean signal on a moderately deep target beats a masked signal on a deeper one, so the M9 often digs more good targets than the M11 on a littered site even though the M11 reaches deeper.

How I run it: On old homesteads I run the M9 across the open yard and switch to the M8 tight against the foundation, where the iron is thickest. The two coils complement each other rather than compete.

When the M9 is the wrong pick: On open fields, pastures and clean beaches, the stock M11 serves you better. It covers more ground per swing and reaches deeper on larger targets, and with little trash to separate, the M9 only slows you down.

Our take: If you want one extra coil that handles almost anything, start with the M9.

M11: The Stock Coil That Sets the Standard

The M11 11-inch round Double-D is the coil that comes in the box with the Manticore, and unlike many stock coils, it earns its place. Minelab calls it a general-purpose coil, and it offers solid depth and coverage right out of the box.

Where the M11 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: The M11 reaches deeper than the M9 and M8, most noticeably on larger targets. How much depends on the ground and the target, so be wary of any single inch figure you read. In hunted-out sites, that extra reach is often where the remaining finds are hiding.

Weight and fatigue: This is where you start to feel the trade-off. After four or five hours, the bigger coil on the end of the shaft becomes noticeable. If you run the M11 as your primary coil, a bungee or arm support makes a big difference.

Our take: If you mostly hunt open areas and want depth and coverage, the M11 already does the job. Don't buy a second coil until you know which conditions the M11 struggles in for you.

M15: Minelab's Largest Manticore Coil

The M15 is the biggest coil Minelab makes for the Manticore. At 15 x 12 inches and 650 g, this isn't a coil you casually swing. You commit to it. Minelab positions it for maximum depth and wide coverage in open spaces.

Where the M15 belongs:

• Large open fields where coverage speed matters
• Beach hunting on wide, flat stretches, where the extra width pays off on wet sand
• Historical sites with sparse targets spread over large areas
• Deep relic hunting for belt plates, cannonballs and other large items

What the extra size gets you: More depth on larger targets and, above all, coverage. The M15's larger footprint covers more ground with each pass than the 11-inch M11, so a big field takes fewer passes. On a full-day field hunt, that's the difference between covering the permission and running out of daylight.

The trade-off: Ground noise. A bigger coil reads a bigger footprint of ground, so it picks up more mineralization. Larger coils can be more affected by mineralization and less sensitive to small targets. On hot soil or salt-affected beaches, expect to ground balance more often or accept more threshold chatter.

Our take: The M15 is right for people who hunt big ground and know how to manage their Manticore settings. It's not the coil for your first season. Learn the detector on the M11 or M9 first, then move up to the M15.

Coiltek Mythtek 18": The Biggest Coil You Can Put on a Manticore

Minelab makes nothing larger than the M15 for the Manticore, as of October 2026. Coiltek's 18-inch Mythtek fills that gap: it is the coil to reach for when the M15 still isn't covering enough ground.

Where the Mythtek 18" 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 to expect: The gain over the M15 is on larger targets at depth, not a dramatic leap on coin-sized finds. On a field that has already been hunted by other Manticore users, that extra reach on deep relics is the reason to run it.

The reality check: This is a specialty coil. At 980 g, the Mythtek is about half again as heavy as the 650 g M15, and an 18-inch coil takes strength and stamina to run, even with support gear. If you're not fully comfortable with the M15, the Mythtek is probably more than you need.

Our take: This is the coil for experienced Manticore operators who've worked their sites with the M15 and want the last deep targets, and for large agricultural fields where time per acre matters.

Which Minelab Manticore Coil Should You Buy First?

Here's our recommendation, based on what customers come back and tell us.

If you own the Manticore with the stock M11:

1. Add the M9 first. It's the lightest Manticore coil and the most versatile second coil, easy to swing all day and good enough to be your daily driver on most sites.
2. Add the M8 second. Once you start hunting sites with iron, you'll understand immediately why this coil exists.
3. Consider the M15 & M8 Coil Bundle if you want both ends of Minelab's range in one purchase.

If you only hunt one type of site:

• Trashy colonial sites: M8
• Mixed parks, woods and creeks: M9
• 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 and large sites: M15, or the Mythtek 18" if you have the experience

Coil Care for Minelab Manticore Coils

Every coil in this guide comes with a skidplate, and we strongly recommend keeping it on. Rocks, roots and pavement edges will chew through the bottom of an unprotected coil in a season. We carry replacement covers for the M8, M9, M11 and M15, and a coil cover costs a small fraction of what a replacement coil does.

Check your coil bolt periodically too. A loose coil connection is a common cause of erratic behavior that people blame on settings or EMI. Snug the bolt, replace worn washers, and you eliminate a common headache. After any coil swap, I run a Noise Cancel and a Ground Balance before hunting, since a different coil reads the ground differently.

Final Thoughts

Between Minelab's four Manticore coils and Coiltek's Mythtek, you can match the Manticore to almost any site type. But the best coil is still the one on your detector when you're actually out hunting. Don't wait for the perfect coil. 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're always happy to talk shop.

Happy hunting.