Things you should know about 3.5mm jack-to-jack audio cable

3.5mm jack-to-jack audio cable

Industry-standard audio plugs include the 3.5mm headphone jack. The most popular applications for this device include connecting a set of stereo headphones to your smartphone and “piping” audio from your phone to an external amplifier in your home or automobile.

Headphones may also come with a microphone, depending on the quantity of connecting rings. The 3.5mm headphone connector is increasingly being dropped from high-end smartphone flagships in favor of Bluetooth headphone connectivity.

The removal of the 3.5mm jack has caused controversy, with smartphone manufacturers arguing that it frees up internal space, enables slimmer phones, and removes a potential entry point for water.

What are the differences between a headphone jack’s 2.5mm, 3.5mm, and 6.35mm sizes?

Size is the primary and most noticeable difference. The values shown correspond to the jack’s diameter, although the connections’ lengths also vary. There are standard sizes for specific uses of 3.5mm jack-to-jack audio cable. For each size of jack, several wiring standards can be used.

Therefore, we’ll discuss the subtle variances and shared characteristics of headphone jacks in this post. An accepted audio plug in the industry is the 3.5mm headphone jack. It is most frequently used to connect a set of stereo headphones to a smartphone or “pipe” audio from a phone to an external amplifier in a home or an automobile. A microphone may also be included with headphones, depending on the quantity of connecting rings.

A Basic Guide to Jacks and Plugs

Before we begin, let’s first clarify the distinction between a headphone connector and a headphone plug.

The headphone plug is put into the jack, which serves as the receptacle. In other words, the male connector is the headphone plug, while the female connector is the headphone jack.

The cable’s end has a plug if your headphones are wired permanently. You can plug headphones into the headphone jack on your audio player, smartphone, laptop, etc.

It should be noted that when individuals use the term “headphone jack,” they occasionally mean the plug. This introduction serves as a distinction between the two and a means of maintaining clarity as we address jacks and plugs jointly later in this article.

The size that is being quoted is the diameter of the jack or plug, and each size has a unique length. The measurements for each headphone jack size are as follows:

This minor difference is not particularly important regarding correct connectivity between quarter-inch plugs and jacks.

Most wired headphones use 15mm-long TRS or TRRS connections with a 3.5mm diameter. Most importantly, consumer audio equipment operates healthy (portable music players, smartphones, laptops, tablets, etc.). Many professional headphones come with a 3.5mm-to-6.35mm adaptor because professional headphone amps often feature 1/4″ TRS jacks.

Here, let’s delve more into the various sizes:

●       6.35mm (1/4 inch) Plug & Jack

If you’ve ever used an amplifier to play an electric guitar or bass, you’ve used a 6.35 (1/4′′) TS “patch” cable. On the other hand, the headphone jack often has an additional pole or conductor in its connector, making it a TRS (tip-ring-sleeve) instead of a TS (tip-sleeve).

The 6.35mm is a considerable size typically used for headphones and other professional audio equipment. Headphone amplifiers, audio interfaces, digital-to-analogue converters, mixing boards, and field recorders are just a few of these gadgets.

●       3.5 mm (1/8 inch) Plug & Jack

Most modern analog wired headphones feature 3.5mm (1/8′′) connectors. The auxiliary “aux” audio connections found in mixing, car audio consoles, and other consumer goods also use the 3.5mm connector.

Be aware that lighting and USB-C digital headphone connectors are spreading in popularity, along with wireless Bluetooth headphones, due to smartphone makers giving up on the headphone jack.

Portable audio players, computers, cellphones, tablets, field recorders, mixing consoles, and audio equipment have 3.5mm headphone ports. TRS 3-pole 3.5mm connectors are commonly used for headphones, while TRRS 4-pole 3.5mm connectors are used for headphones with microphones.

●       The Plug & Jack 2.5mm

The 2.5mm (3/32′′) connector is less often used in pro audio applications. However, 3.5mm jack-to-jack audio cable is still frequently utilized in walkie-talkies and some video cameras.


These connectors are frequently called headphone jacks since they are frequently used for headphones, thus the name. It’s common to refer to a jack as a headphone jack if it was designed exclusively for headphones. Those mentioned above, 2.5mm, 3.5mm, and 6.35mm connectors are used for much more than just headphones.

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