1/4 in Male to 3.5mm Female Straight Headphone Adapter for Metal Detectors

This straight headphone adapter has a 1/4 in (6.35 mm) stereo plug on one end and a 3.5 mm (1/8 in) stereo jack on the other. It lets you use headphones or earbuds with a 3.5 mm plug on a metal detector that has a 1/4 in headphone jack. The adapter body runs in a straight line, so your headphone cable leaves the detector in line with the jack. It is a compact one-piece adapter with no cable and no volume control.

Connectors

• Into the detector: 1/4 in (6.35 mm) stereo male plug
• For the headphones: 3.5 mm (1/8 in) stereo female jack
• Layout: straight, with the plug and jack in line
• Part number: HP-1814-STR

When you need this adapter

You need the HP-1814-STR when your detector has a 1/4 in headphone jack and your headphones end in a 3.5 mm plug.

It is not the right part when:

• Your detector has a 3.5 mm socket. 3.5 mm headphones plug straight in without an adapter.
• Your headphones have a 1/4 in plug and the detector has a 3.5 mm socket. That takes the reverse adapter, a 3.5 mm plug to a 1/4 in jack. Adapter cables are listed with our metal detector headphones.
• Your detector uses a waterproof headphone connector instead of a round jack. The detector maker's adapter cable has to go on first.

What the design means in use

• Straight body. The adapter adds length straight out from the jack. It suits detectors where the jack sits on the back or underside of the control box, away from your arm.
• Stereo connections. Both ends are stereo, so use headphones with a stereo 3.5 mm plug. Some detectors do not work with mono plugs.
• Passive adapter. No batteries and no volume control. Volume is set on the detector or on the headphones.

What is in the package

One straight adapter. Headphones and cables are not included.

Detectors this adapter plugs into directly

These detectors have a standard 1/4 in headphone jack, checked against the manufacturer's manual or product page as of October 2026:

• Garrett ACE 200, Garrett ACE 300 and Garrett ACE 400
• Fisher F22, Fisher F44 and Fisher F75
• Fisher Gold Bug and Fisher Gold Bug Pro
• Bounty Hunter Tracker IV

Fisher's manuals for the F75, Gold Bug and Gold Bug Pro state that mono headphones will not work on those detectors, so pair this adapter with stereo 3.5 mm headphones.

Detectors that do not need it

These detectors have a 3.5 mm (1/8 in) headphone socket, so 3.5 mm headphones connect without an adapter (as of October 2026):

• Minelab Equinox 700 and Minelab Equinox 900
• Minelab Manticore
• Minelab X-Terra Pro and Minelab X-Terra Elite
• Minelab Vanquish 360, Minelab Vanquish 460 and Minelab Vanquish 560
• Garrett ACE Apex
• Garrett Vortex VX5, Garrett Vortex VX7 and Garrett Vortex VX9

Detectors with a waterproof headphone connector

These detectors use a sealed connector, so the maker's own adapter goes on first to provide a 1/4 in jack. The HP-1814-STR then plugs into that jack for 3.5 mm headphones.

• Garrett AT Pro, Garrett AT Gold and Garrett AT Max: Garrett's 1/4 in Headphone Adapter, part number 1626000, converts the 2-pin connector. Garrett states its adapter is not for submerged use.
• Nokta Legend, Nokta Legend 2, Nokta Simplex Ultra, Nokta Score, Nokta Double Score and Nokta Triple Score: Nokta's Headphones Adapter, part number 17000731, converts the combined headphone and charging socket to a 6.3 mm (1/4 in) jack. Nokta's Simplex Ultra manual lists that adapter for land use only.

Dry-land use only

The HP-1814-STR has no waterproof rating, so keep it out of rain and water. Fisher's F22 and F44 manuals also advise against using headphones in rain or very wet conditions. For wading or surf hunting, use waterproof headphones made for your detector's own connector.

Straight or right angle

We also carry a right angle version, part number HP-1814-ANG, with the same 1/4 in stereo plug and 3.5 mm stereo jack. Both make the same connection. The straight adapter (HP-1814-STR) keeps the cable in line with the jack, and the right angle adapter turns it 90 degrees so it sits closer to the control box. Choose by where the jack sits on your detector.