Minelab Manticore M8 vs M9 Coil: Which One Should You Use?

Short answer: for most Minelab Manticore owners the M9 is the better coil to add first, and the M8 is the one to add when you hunt iron-packed sites. The M9 is also the lighter of the two: the 9-inch round M9 weighs 366 g and the 8 x 5.5-inch M8 weighs 390 g, both with the skidplate fitted. The smaller coil is not the lighter one.

Both are Double-D coils made only for the Manticore, and both are waterproof to 5 m (16 ft), the same as the detector. What separates them is footprint: the M8 trades coverage for separation in trash and tight spots, and the M9 trades a little of that separation for a wider sweep and an easier swing. If you are weighing every Manticore coil, including the stock M11 and the M15, our Minelab Manticore coils guide covers the full lineup. This post sticks to the M8 or M9 decision.

M8 vs M9 Side by Side

Sizes, waterproof ratings and part numbers are Minelab's published figures, as of October 2026. Weights are with the skidplate and cable fitted.

Weight: The Smaller M8 Is the Heavier Coil

The Minelab M8 weighs 390 g with its skidplate and the Minelab M9 weighs 366 g, so the M9 is 24 g (about 0.8 oz) lighter. Minelab calls the M9 the lightest Manticore coil. Plenty of people assume the opposite because the M8 is the smaller coil. Both are lighter than the stock 11-inch M11 that comes on the Manticore, which weighs 532 g with its skidplate, so coming off the stock coil the M9 saves 166 g and the M8 saves 142 g.

In the hand the M8 still feels quick. There is less coil out at the end of the shaft, so it is easy to steer around a fence post or a tree root. But if the reason you are shopping is a lighter swing for long sessions, the M9 is the coil to buy, not the M8. On a full Manticore, which Minelab lists at 1.3 kg (2.9 lb), a 24 g difference between these two coils is real but small. Pick on footprint first and treat weight as the tiebreaker.

Where the Manticore M8 Coil Does Better: Iron, Trash and Tight Spots

The Minelab M8 coil earns its place on the Manticore at sites where targets sit close together. Minelab describes it as the coil for precision in high-trash areas and names urban parks, old homesteads and construction sites as its ground. A smaller footprint sees fewer targets at once, so a coin lying next to a nail has a better chance of giving its own clean signal instead of a broken one.

The places I reach for the M8 on a Manticore:

• Cellar holes where nails and iron scrap sit inches apart
• Hard-hunted parks and tot lots full of foil, tabs and caps
• Fence lines, brush piles and the gaps between rocks, where the M9 keeps snagging

The trade-off with the M8 is coverage. You will work slower and need tighter overlap between swings, and on clean ground that extra effort buys you nothing. Minelab also says the M8 has great sensitivity to small targets, which is part of why it suits trashy jewelry spots, but it is a specialist coil, not an everyday one.

Where the M9 Does Better: Coverage, Water and Long Days

The Minelab M9 is the middle ground. Minelab calls it an all-purpose coil with moderate ground coverage and points it at woodlands, riverbanks and old battlefields, where Minelab notes a mix of surface and deeper targets. Its 9-inch round footprint covers more ground per swing than the M8 while still being small enough to work moderate trash.

Three things push me toward the M9:

• Mixed sites. Parks with moderate trash, wooded lots and creek banks, where you want separation and coverage on the same hunt.
• Water. Minelab notes the M9's low profile makes it easy to sweep through water, which helps when wading and working around rocks and pilings.
• Long sessions. The M9 is the lighter of the two coils.

Where the M9 gives ground to the M8 is the worst iron. In a true nail bed, the M8's narrower footprint will separate targets the M9 starts to blend.

Do You Need Both the M8 and the M9?

You need both the M8 and the M9 only if you regularly hunt sites where the M9 is giving you broken, iffy signals from iron. If most of your hunting is mixed parks, woods and water, the M9 already covers it and the M8 will spend most of its time in the truck.

The M8 is the smaller coil, so it never adds coverage; it earns its place through separation. If iron-heavy relic sites are a big part of what you hunt, it is the right second extra coil: the M9 handles the less trashy part of a site and the M8 goes in where the iron is packed tightest. If what you really want is more coverage than the stock M11 gives you, the M15 is the coil to look at, and our coils guide explains where it fits.

Where Neither Coil Is the Right Pick

Neither the M8 nor the M9 is built for wide-open fields and clean beaches. Minelab's coil guidance points to larger coils for open ground, and the stock 11-inch M11 that comes with the Manticore is the one to leave on for wide-open, low-trash sites. Minelab doesn't publish depth figures for the M8 or M9, and its own advice for deeper detection is the M11 or M15.

M8 or M9: Which One to Buy

Buy the Minelab M9 first if you want one extra coil for parks, woods, water and long days; it is also the lighter coil. Buy the Minelab M8 if you spend your time in iron, trash and tight spots and want the separation of the smallest Manticore coil, accepting slower coverage and a slightly heavier coil. If you are still deciding which coils belong in your kit, our Manticore coils guide walks through the M11 and M15 as well, so you can see which end of the range you actually need.