A multi-frequency metal detector transmits several frequencies at once, so one detector keeps a steadier target ID on wet salt sand and in mineralized ground and handles coins, jewelry, relics and small gold without changing frequency. Minelab, XP and Nokta each have their own name for the technology: Multi-IQ, FMF and SMF.
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A single-frequency VLF detector runs one frequency, which forces a trade-off: low frequencies respond better to larger, more conductive targets such as large silver coins, while high frequencies respond better to small, less conductive targets such as gold nuggets and fine jewelry. A simultaneous multi-frequency detector removes that compromise by transmitting and receiving multiple frequencies at once and combining the data in real time. The result is broader sensitivity across target types, more reliable target ID and stable operation on wet salt sand and mineralized ground, where single-frequency machines get noisy. If you want one detector for parks, fields and beaches, start with multi-frequency.
Simultaneous vs Selectable Frequency
Multi-frequency on this page means simultaneous: the detector runs its frequencies at the same moment, with no switching. A selectable-frequency detector, such as the Minelab X-TERRA PRO with its 5, 8, 10 and 15 kHz settings, runs one frequency at a time that you choose, and the XP ORX and the original XP DEUS work the same way. Those models sit with our VLF metal detectors.
Most simultaneous detectors also offer single frequencies for special cases. The Minelab EQUINOX 900 has six (4, 5, 10, 15, 20 and 40 kHz) and the XP DEUS II has 49 from 4 to 45 kHz with its FMF coils. Nokta's Score manual notes that where there is electromagnetic interference, its 15 kHz single frequency may be less noisy than Multi.
Multi-IQ, FMF, SMF and Multi-Flex: Same Idea, Different Names
Each maker markets simultaneous multi-frequency under its own name, and the systems are more alike than different. Minelab calls it Multi-IQ, with Multi-IQ+ on the MANTICORE; its CTX 3030 runs FBS 2, its EXCALIBUR II underwater detector runs BBS, and its GOLD MONSTER 2000 runs Multi-Au for gold. XP calls it FMF, Fast Multi Frequency. Nokta calls it SMF, Simultaneous Multi Frequency. Garrett builds it into Multi-Flex on the ACE Apex and the Multi-Freq. settings of the Vortex series, and the ACE Apex, Vortex VX7 and Vortex VX9 add a Multi-Salt setting for saltwater beaches. On all-purpose detectors, Multi-IQ, FMF, SMF and Multi-Flex all deliver the core multi-frequency advantages; the differences come down to ergonomics, software, tones, waterproofing and coil options rather than a fundamental gap in the technology. Choose on feel, features and budget, not on the acronym.
Multi-Frequency Metal Detectors Compared
Our multi-frequency metal detectors include the Minelab MANTICORE, EQUINOX and VANQUISH series, the XP DEUS II, the Nokta Legend 2 and Score series, the Garrett ACE Apex and Vortex series and the Fisher CZ-21. The table covers the current multi-frequency models we recommend, apart from the GOLD MONSTER 2000 gold detector, with the maker's technology name, frequencies, water rating and wireless audio.
Multi-Frequency vs VLF vs Pulse Induction: Which Should You Buy?
Multi-frequency is the right call if you hunt saltwater beaches, if you work variable or mineralized soil and don't want to keep re-tuning, or if you want one versatile machine for coins, relics, jewelry and the occasional beach trip. Check the waterproof column before you wade, because the ratings run from a submersible coil only to full dive depth.
If you hunt only dry, mild ground for coins and relics, a single-frequency VLF detector is still a good choice and often costs less. For the deepest gold in the harshest ground, pulse induction is the specialist tool: it largely ignores mineralization and reaches deep nuggets, at the cost of target discrimination. Minelab's GOLD MONSTER 2000 brings simultaneous multi-frequency (Multi-Au) to gold prospecting, and our gold detectors page compares every gold machine we carry.
Why Buy Your Multi-Frequency Metal Detector from Serious Detecting?
Free Shipping on Orders Over $99: Your multi-frequency metal detector ships at no extra cost across the continental US.
Authorized Dealer for Every Brand We Carry: Showroom and local pickup in Ypsilanti, Michigan, the full manufacturer warranty on every detector and product registration support.
Help Before and After You Buy: Our staff answer setup, coil and multi-frequency questions by phone at (844) 771-0707 or by email.
Customer Questions & Expert Answers
Get real answers from outdoor explorers and our product experts. Browse questions about performance, features, and setup —or ask your own to make sure this gear fits your next adventure.
Which Minelab detectors use Multi-IQ?
Minelab's Multi-IQ simultaneous multi-frequency runs the EQUINOX 900 and EQUINOX 700, the VANQUISH 340, 360, 460 and 560 and the X-TERRA ELITE, and the MANTICORE runs the more powerful Multi-IQ+. The older EQUINOX 800 also ran Multi-IQ; the EQUINOX 900 replaced it.
The X-TERRA PRO is not a Multi-IQ detector: it runs one selectable frequency at a time. Our Multi-IQ technology post explains how it works.
Answered by
Dan P.
· April 2026
Are Multi-Frequency metal detectors good for beginners?
Yes, multi-frequency metal detectors are good for beginners, because the entry models start from ready-made search modes. The Minelab VANQUISH 360 has Park, Beach and All Metal modes, and the Nokta Score has Park, Field and Beach modes, so you pick the mode for the site and start detecting.
If you are moving up from an older single-frequency detector, you will notice the biggest difference on salt beaches and in mineralized ground. To compare entry models across technologies, see our beginner and intermediate detectors.
Answered by
Dan P.
· December 2025
Are Multi-Frequency detectors good for saltwater beaches?
Yes, multi-frequency detectors are a strong choice for saltwater beaches. Wet salt sand gives a strong ground signal that makes many single-frequency detectors noisy, and a simultaneous multi-frequency detector stays steadier there while still responding to both small gold jewelry and larger coins. Use the detector's saltwater setting: Beach modes on the Minelab MANTICORE and EQUINOX, Multi-Salt on the Garrett ACE Apex and Vortex VX7 and VX9.
Check the water rating before you wade. Most current models are submersible to 5 m (16 ft), but the ACE Apex control box has to stay above the water, and for diving the Minelab EXCALIBUR II (60 m, 200 ft) and Fisher CZ-21 (76 m, 250 ft) go much deeper. See our beach metal detectors and the beach metal detecting guide.
Answered by
Richard T.
· December 2025
Are Multi-Frequency metal detectors good for gold prospecting?
Multi-frequency detectors can find small gold, and some are built for it. The Minelab GOLD MONSTER 2000 is a dedicated gold detector that runs Multi-Au, simultaneous multi-frequency from 12 to 76 kHz. All-purpose detectors with a gold setting include the Minelab EQUINOX 900 (Gold mode), the MANTICORE (Goldfield mode) and the XP DEUS II, which reaches 120 kHz single frequency with its HF2 coil.
For larger, deeper nuggets in heavily mineralized ground, a pulse induction or Minelab ZVT detector reaches further. Compare every option on our gold detectors page.
Answered by
John W.
· December 2025
What is a simultaneous multi-frequency metal detector?
A simultaneous multi-frequency metal detector transmits several frequencies at the same time and processes the combined response from the target and the ground. A single-frequency detector runs one fixed frequency, so it never gets the low and high frequency response together.
Because the detector reads all of its frequencies on every sweep, it keeps a more reliable target ID in variable soil and on salt beaches, where a single frequency tends to lose stability and give false signals. Our metal detector technologies guide explains how it compares with VLF and pulse induction.
Answered by
Richard T.
· April 2026
Which brands make simultaneous multi-frequency metal detectors?
Five brands we carry make simultaneous multi-frequency metal detectors. Minelab uses Multi-IQ on the EQUINOX, VANQUISH and X-TERRA ELITE detectors and Multi-IQ+ on the MANTICORE. XP uses Fast Multi Frequency (FMF) on the XP DEUS II, ICON and ICONX. Nokta uses SMF on the Nokta Legend 2, the Legend Pro Pack and the Score series. Garrett has Multi-Flex on the Garrett ACE Apex and multi-frequency on the Vortex VX5, VX7 and VX9, and Fisher's CZ-21 underwater detector transmits 5 kHz and 15 kHz at the same time.
Not every model from these brands is multi-frequency: the Nokta Simplex ULTRA, for example, runs a single 15 kHz frequency.
Answered by
John W.
· April 2026
Is high frequency the same as multi-frequency?
No. A high frequency metal detector runs one frequency far above a coin detector's, such as 45 kHz on the Minelab GOLD MONSTER 1000, to pick up small gold and thin jewelry. A multi-frequency metal detector transmits several frequencies at once, and some multi-frequency detectors include high frequencies: the Minelab GOLD MONSTER 2000 runs 12 to 76 kHz simultaneously, and the XP DEUS II HF2 coil runs 9 to 90 kHz in multi-frequency.
High frequency suits small gold in mild ground; multi-frequency is steadier in salt and mineralized ground, and models that include high frequencies, such as the GOLD MONSTER 2000, still respond to small gold. Our high frequency metal detecting post covers small gold and jewelry.
Answered by
John W.
· November 2026
What is the cheapest multi-frequency metal detector?
The most affordable multi-frequency metal detector we recommend is the Minelab VANQUISH 360. Our recommended multi-frequency detectors cost about $200 to $400 for the detector alone: the VANQUISH 360, 460 and 560 and the X-TERRA ELITE, the Nokta Double Score and Score, the Garrett ACE Apex and the Garrett Vortex VX5. Bundles with a pinpointer or extra coil cost more.
Within that band, price follows waterproofing, coils and wireless audio. The VANQUISH 360, 460 and 560 are all submersible to 5 m (16 ft), and the 460 and 560 add Bluetooth LE Audio for wireless headphones. Browse our metal detectors from $200 to $400.
Answered by
Dan P.
· November 2026
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