Why the 9-Inch M9 Coil Rarely Leaves My Minelab Manticore: Performance review
Image below myself with the trusty M9 coil on the beach.
If you own the Minelab Manticore, you already know it is an absolute beast of a machine. But if you are still swinging the stock 11-inch coil all day, you might be missing out on the best metal detecting experience this detector can offer.
For the past several months, I have used the 9-inch M9 coil exclusively for 80% of my hunts. While the standard machine setup is incredible, swapping to the 9-inch round Double-D coil completely changes the game. It alters how the detector handles, how long you can stay out, and what you can pull out of the ground.
Deep Dive Performance Breakdown
⚖️ The Weight & Ergonomics: A Total Game Changer
When you are out in the fields for hours on end, the weight of your setup is everything. Swapping to the M9 coil instantly transforms the physical feel of the Manticore, taking it from a slightly nose-heavy machine to a perfectly balanced extension of your arm.
- Ultra-Lightweight Profile: It weighs in at a mere 362 grams (12.8 oz) including the protective skidplate, making it the lightest coil in the entire Manticore lineup.
- All-Day Comfort: Because it is noticeably thinner with less heavy internal bracing, you can easily swing for 4 to 6 hours straight without your shoulder or wrist screaming at you.
🔍 Target Separation: Slicing Through Iron Trash
Hunting in iron-infested ground, old home sites, or trashy parks can be incredibly frustrating with a large coil. The M9 completely changes how the machine behaves in these high-trash environments, allowing you to unearth targets that others have walked straight over.
- Laser-Sharp Discrimination: The smaller Double-D footprint allows the Manticore’s Multi-IQ+ technology to isolate non-ferrous targets directly next to iron masking.
- Quieter Operation: It drops the erratic chatter and EMI feedback significantly, behaving beautifully over highly mineralized soil.
- Tight Spots: The smaller profile allows you to snake easily around tree roots, submerged logs, and tight fence lines where an 11-inch coil simply cannot fit.
🕳️ Depth: Breaking the Rules of Smaller Coils
Usually, going down in coil size means sacrificing a massive amount of depth. I fully expected to lose those deep, faint whispers when I put this on, but the reality completely shattered that old rule of metal detecting.
- Minimal Depth Loss: Side-by-side with the 11-inch, I only notice a minute difference on coin-sized targets, still regularly nailing deep silver and hammered coins at 10+ inches down.
- Higher Sensitivity: Because the smaller coil collects less ground noise, you can actually bump the Manticore's sensitivity a touch higher than you could with the stock coil, making up for the smaller footprint.
🌊 Ground & Water Coverage: The Surprise Factor
You would think a 9-inch coil would feel tiny and restrictive on a swing, but the actual ground coverage seems to be outstanding. It handles the terrain fluidly, and it offers an unexpected bonus if you like getting your boots wet.
- Water Drag Reduction: If you detect beaches, rivers, or streams, this low-profile design glides right through the water with almost zero resistance, eliminating the frustrating "paddle" effect against the current.
- Fluid Swing: On dry land, the clean swing path makes your coverage feel incredibly efficient, tight, and controlled.
The Pros & Cons Breakdown
What Makes This Coil Phenomenal
The benefits of this setup are overwhelming. It builds on everything the Manticore does right and optimizes it for peak performance and physical comfort.
- Featherlight: Saves your back and keeps you hunting longer.
- Elite Separation: Pulls clean signals out of heavy iron contamination.
- Punchy Depth: Retains nearly all the raw depth power of the Manticore.
- Stable: Allows higher sensitivity with less interference.
- Water Friendly: Zero drag in water and waterproof down to 5 meters.
Click the below image to see the M9 in action in super dry soil condistions.
The Only Con Worth Mentioning
No bit of gear is absolutely perfect, but with this setup, there is truly only one real downside to consider before you make the switch.
- Ground Coverage: Because it is a 9-inch coil, you will have to walk slightly slower and overlap your swings more precisely to ensure you are not leaving gaps in massive, wide-open fields.