A guide to audio connectors and cable types

Author: Hou

Mar. 07, 2024

Electrical Equipment & Supplies

Thankfully, hooking up audio and AV systems is much more straightforward than it used to be. For most people, home entertainment systems no longer consist of large racks of individual components hiding a rat’s nest of wires and connectors, and we’re better off for it. But there are still times you need to connect audio hardware devices, and if you need to source cables (cords), connectors, or adapters, knowing the specific names of each type is necessary. Let’s go over the ones you’re most likely to encounter.

Editor’s note: This post was updated on July 7, 2023, to account for changes in our house style and formatting standards.

How do I connect my headphones?

The two most common sizes of TRS jack connectors.

Wired headphones connect to a playback device’s analog headphone socket using a jack plug. Suppose they’re standard stereo headphones with no microphone. In that case, it’s a three-terminal tip-ring-sleeve (TRS) connector, easily identified by the two insulating bands (usually black) on the barrel of the jack. These are commonly found in two sizes. The smaller size found on portable devices is referred to as a minijack, or by its diameter, 3.5mm. It’s sometimes called a 1/8-inch jack in the US, though that’s an approximation. The larger size of headphone jack you’ll find is commonly known as a 1/4 inch (or 6.3mm) jack plug. Adapters are easy to find to change one size jack plug to the other.

This earphone’s cable terminates into a 90-degree TRRS jack.

Wired headphones with a microphone built-in use a modified version of the same-sized minijack plug but with an additional electrical terminal (to carry the mic signal) in the form of an extra ring, making it a tip-ring-ring-sleeve (TRRS) connector, which has three insulating bands visible on the barrel.

How do I connect my headphones when there’s no jack socket?

These end in a 3.5mm connector, so you’ll need to use a stupid dongle on new phones.

Since smartphones have abandoned the headphone jack, you have three options. If you already have wired headphones you want to use; you’ll need a special adapter (a dongle) to connect to the phone’s system connector (a Lightning connector on iPhones or USB-C for basically everything else) and provide you with the analog 3.5mm headphone socket you need to plug in your headphones. These are also referred to as digital-to-analog converters (DACs).

If you want to stick with wired (for reasons) and don’t want to deal with dongles, you can get a set of wired USB headphones to plug directly into your phone. If you prefer to avoid dealing with dongles or wires, you can also go down the wireless, Bluetooth route.

What are the other types of headphone connectors called?

The Drop+Ether CX closed-back headphones come wired with a four-pin XLR for differential drive.

You may have run into premium headphones with other jack sizes, different pin configurations (4.4mm Pentaconn), or larger XLR-type connectors. These are required to run your headphones in a balanced or differential drive configuration.

What connectors are used at the headphone end of the cable?

The cable plugs into the bottom of each ear cup via 2.5mm jacks.

When the cable is removable, the plugs used at the headphone end vary quite a bit, and we won’t cover them all here. 3.5mm jacks with a twist-to-lock system are relatively common. You’ll also find 2.5mm TRS jack plugs on some headphones (Bose, for example), while others have 2.5mm TS jack inputs at the bottom of each ear cup for the wires to connect to (the Monoprice Monolith M1060, for example). Premium headphones can use mini XLR connectors; some use propriety connectors like Sennheiser‘s two-pin push-fit connector.

The MMCX connectors are gold-plated and fit snugly into the SE215 female input.

Many in-ear monitor (IEM) headphones employ micro-miniature coaxial (MMCX) connectors. As the name implies, this connection standard is small enough to fit into a pair of in-ear monitors easily. These are used mainly for better-engineered in-ear monitors, where having a replaceable cable means the headset doesn’t become trash if the cable fails. Plus, the connection itself locks into place and allows for 360 degrees of rotation, so not only does it make the cable easier to replace, but it also makes it harder to break in the first place.

What else are jack plugs used for?

Jack plugs are also used to connect audio signals at “line level” in several contexts. 3.5mm TRS minijacks are found at the ends of the standard auxiliary (“aux”) cable to connect your phone directly to a portable speaker or car stereo system. The larger 1/4-inch plugs are used in semi-professional applications to connect signals using TS plugs (unbalanced applications) or TRS plugs (balanced applications).

What are XLR connectors?

XLR cables are used for microphones and other pro audio applications.

XLR connectors carry the tiny electrical signals produced by microphones and in other instances where signal integrity is essential — typically professional audio environments. Microphones have male outputs, and mic preamps have female input connectors on the front; hence, the standard XLR cable has a female on one end and a male on the other. The locking connectors are relatively large and heavy, explicitly designed for carrying balanced signals and wired using balanced (microphone) cable. This cable type is well suited to longer cable runs, as they have better shielding and noise rejection abilities.

What are RCA connectors?

RCA-type plugs are usually color-coded red (right) and white (left) for stereo interconnection.

RCA (or phono) connectors are smaller cinch-type connectors used in interconnects for connecting “line level” audio signals in consumer products. You’ll likely recognize the red and white color-coded stereo cables from their use in connecting older hifi system components or the yellow plugs that carry analog video signals to TVs from old DVD players, VCRs, or video game consoles. Since they can only carry unbalanced signals, they’re only suitable for relatively short-distance transmission of audio and video signals. They are still reasonably common, particularly for connecting record player turntables to phono input stages or connecting home theater subwoofers. They are also used for coaxial, digital audio connections (see the section later on).

Unlike a lot of connectors, the RCA name isn’t derived from a particular physical aspect of the connection. It’s named after the Radio Corporation of America, which developed and introduced the standard in the 1930s.

What connectors are used for speaker cables?

Speaker wire comes in different gauges and can be terminated with bare connections or connectors like these gold-plated banana plugs.

Unless you’re hooking up a PA system, the primary connector you’ll likely need to connect your speakers is the banana plug, shown above on the right. Many speakers have binding posts or terminal clamps that will accept the bare ends of the speaker wire. If that’s the case, connecting the positive terminal at the source (amplifier) to the corresponding terminal on your speaker is essential to keep everything in phase. Most speaker wire has an identifying mark on one of the conductors to help you keep track of what’s what.  In some smaller powered speaker systems, the cable that connects the left and right speakers uses RCA (phono) connectors, as shown below.

Active loudspeakers have built-in amplifiers and require a power source.

How is speaker wire different from regular stereo wire?

Stereo interconnects, which usually have red and white (or red and black) labeled RCA connectors on the ends, are intended for low audio voltages (line level) with low current, and have a central insulated conductor surrounded by a shield (ground) for each channel (left and right).

Speaker cable, or speaker wire, consists of a pair of conductors surrounded by an insulating, flexible PVC or similar material that either has bare ends or banana plugs (see above) at the end. This cable should be specified to carry the power needed to drive loudspeakers to produce sound. Heavier gauge wire is required for higher power, and cables should always be kept as short as possible. As long as these basic requirements are met, there’s no point in spending a lot of money on cables, as this past experiment demonstrates.

How are digital connections different from analog ones?

Digital audio connections transfer signals between devices without converting them to analog and back again, which means the quality is preserved. Another bonus is that digital signals are less susceptible to sources of noise and interference, which makes cable quality even less of a concern than with analog.

What type of wire do I need for a digital audio connection?

HDMI cables carry up to 32 channels of digital audio.

Standard consumer-level wired stereo digital connections, often labeled “coax”(pronounced co-axe, not like the word coax), use the same RCA connectors we discussed previously, specifically with 75ohm coaxial cable. Home theater and AV systems are more likely to use high-definition multimedia interface (HDMI) cables, which also carry digital video signals. These allow eight or 32 audio channels (for HDMI version 2 and above) for surround systems, including Dolby ATMOS, and offer bidirectional capabilities in the form of HDMI ARC and eARC.

What are optical connections for?

An optical cable can transmit stereo digital audio signals.

Optical cables (also called TOSLINK) carry digital audio between devices in much the same way as a wired coax connection, using light to represent the binary data instead of electrical voltage levels. These are preferred in most applications for stereo as they provide electrical isolation between devices, and they can also carry up to eight audio channels in multichannel applications.

If you’re looking to transfer audio between devices, these are the most common ways, depending on the type and age of equipment you’re looking to connect. Hopefully, this has helped, and now whether you’re looking to listen to music wirelessly or hook up a state-of-the-art soundbar, you’ll know what you need to do it.

3.5mm Stereo Cables and What they Entail

The 3.5mm stereo audio cables are designed for use in computer audio applications. They are typically used to connect a PC sound card, mini stereo audio device, or a portable CD player to a multimedia speaker. There are various kinds of 3.5mm audio cables; however, all of them feature a 3.5mm mini connector of some type.

This connector is often found connecting headphones and earphones. The input for the connector can come from PCs, DVD players, MP3 players, TVs, and CD players. While the connector combinations used in a 3.5mm stereo cable varies, the stereo sound can be transmitted, that is, it can be used for surround sound and sound perspective applications that enhance listening pleasure.

Types of 3.5mm Stereo Cables

There are a variety of cables that can be designated 3.5mm stereo cables. These include:

Mini plug to RCA: This is the cable used to connect iPods and stereos to computers. One end sports the 3.5mm connector while the other end has two color coded RCA plugs. The red plug is the right stereo cord while the white one is the mono or left cord. This cable provides great listening pleasure as it optimizes the signals. The 3.5mm connector is easy to identify as it resembles that found in the connecting end of cables attached to headphones and earphones.

Female Jack to RCA: This cable has a 3.5mm connector at one end and two RCA connectors at the other.

Mini Plug to female RCA: This cable has a mini 3.5mm connector at one end and two female RCA connectors at the other. The two female RCA connectors allow a set of male RCA connectors to be inserted into them.

Stereo Headphone Jack Splitter: This cable has a 3.5mm male connector at one end and two female 3.5mm connectors at the other end. This enables you to connect the output to two stereos or two sets of headphones. However, though this cable splits the sound, there is no stereo effect as only a single stereo signal is transmitted by the cable. This means that you cannot use this cable to connect to two sides of a stereo receiver to obtain stereo effect.

3.5mm to 3 RCA: This cable helps connect both audio and S-video signals. This is often used to connect cameras and camcorders. At one end of the cable you will find a male 3.5mm connector while at the other end are three male RCAs. Two of these are used for transmitting audio signals while the third can transmit S-video signals.

RCA to 3.5mm Mono Cable: This cable has a mono 3.5mm connector at one end and a RCA connector at the other. The connectors are gold plated. The cable can be used to connect small audio devices to other devices such as a mixer. However, the cable can only produce a mono sound connection, not stereo.

Headphone Extension: This cable can be used to extend the length of the headphone cable. It has a male 3.5mm connector at one end and female connector at the other. The cable length can vary from 6 feet to 100 feet. The length of the cable used does not affect the quality of the audio transmission. You can use this cable if you want to connect the audio output from a TV to your headphone to avoid disturbing others around you.

Patch Cable: This 3.5mm connector cable has male 3.5mm connectors at both ends. These cables can vary in length from 3 feet to 100 feet. They are essentially auxiliary cables and can connect a variety of audio devices from car stereos to MP3 players.

Enhanced Features

When you are looking to purchase 3.5mm stereo cables you need to be aware of the potential problems. One main issue with these cables is the small connectors that are breakable. This is because the connectors are made by bonding copper and gold plated barrels using their size differences. If one of the components is loose, it can become jammed into the receiving plug of the device you are connecting. As such you need to check the 3.5mm connector before inserting it into any device. Also, the wire can be easily worn out, leading to audio distortions or even failure.

However, you can avoid most of these problems associated with 3.5mm stereo cables if you ensure that the cable you purchase is made to higher standards. Ideally, the cable should be made of 99.99 percent oxygen free copper wire.

Additionally, the cable should have a low loss 95 percent spiral wound copper shield. It should also have a 26 AWG gauge and a stranded copper center conductor. Nickel or gold plated connectors provide better protection against corrosion, increasing the life of the cable. Fully molded construction of the connectors also makes them less prone to damage and wear and tear.

The 3.5mm stereo cables are used to connect a variety of audio devices such as MP3 players, CD players, DVD players, and TVs to multimedia receivers including headphones and earphones. The various combinations include one male 3.5mm connector a choice of RCS connectors – two or three, male or female.

Some cables have 3.5mm connectors at both ends. While some cables can transmit and deliver stereo sound, others can only deliver or transmit mono sound. You need to pick the right 3.5mm cable for your needs after assessing the actual requirements. These cables are available in various lengths from 1.5 feet to 100 feet.

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A guide to audio connectors and cable types

3.5mm Stereo Cables and What they Entail

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