How Do I Convert Red And Black Speaker Wires To A 3.5mm Audio Jack

Norvan Martin
As an Amazon Associate, we earn from qualifying purchases made on our website.

Do you have an old stereo speaker with red and black speaker wires but wondering how you can convert it to a 3.5mm audio jack to connect to your computer? That is exactly why we have prepared this article. Read on to find out more.

Here is the easiest way to convert red and black speaker wires to a 3.5mm audio jack:

  1. Unscrew or cut away the black sleeve covering the terminals.
  2. Locate the tip and band connectors on the audio jack.
  3. You then also need a soldering iron and some solder. Connect (solder) the audio jack to the red and black speaker wire. Connect the black wire to the sleeve and the red wire to the tip. Check out this illustration:

How Do I Convert Red And Black Speaker Wires To A 3.5mm Audio Jack

Can I Convert the Red And Black Speaker Wire To A 3.5mm Audio Jack?

Converting red and black speaker wires to a 3.5mm audio jack is possible. Before you can do this, you need a 3.5mm Mono Jack plug, a soldering iron, and some solder. The jack comes with a sleeve covering the terminals.

3.5mm Audio Jack tip and sleeve

Most 3.5mm jacks are however stereo jacks. Stereo 3.5mm jacks have three conductors – a tip, a band in the middle also known as the “ring”, and the base of the jack also known as the “sleeve.” They are therefore sometimes called “Tip, Ring, “Sleeve” jacks, or simply “TRS” jacks. In most cases, the tip is on the left, and the ring is on the right.

How To Convert Red And Black Speaker Wire To A 3.5mm Audio Jack – Detailed Guide 

1. Unscrew The Sleeve: Begin by unscrewing the sleeve to expose the two metal pins with holes in them. The pins are made to make the wire connections easier.

2. Check If Mono or Stereo: If your jack plug is a stereo, it will have two black lines. However, if it is mono, it will have only one black line. The lines are used to separate the two or three wires.

3. Solder The Wires: The Mono one will have positive/mono (red), and earth/ ground/negative (black) wires. On the other hand, stereo jacks have two pins – ground (black), right positive, and left positive. If you have two speakers, one red wire will be connected to one of the center pins, while the other red wire from the second speaker goes to the other center pin.

Once the red wires are connected to the center pins, the black wires are combined and wired to the outer edging pin. Majorly, the ground/negative pin in electronics is a shared pin. Ensure the wires are correctly soldered to avoid loose connections.

Also, once the wires are soldered, be sure to keep the bare wires as short as possible. This is to avoid any contact between the bare wires with any other pins or other bare wires. Besides, the positive and negative wires should not cross each other.

Although some people may shove a small piece of cardboard between the pins to shield the red and black wires, this is extremely unnecessary. You simply need to ensure the wires are not crossing each other and are not bare to cause any contact between each other.

Speaker Connections

Once the wire is converted to a 3.5mm audio jack, you will probably need to play audio on the speaker by plugging the jack into your audio system.

However, before you do this, remember to conduct the following checks:

  • Confirm that the audio system you want to plug the speaker jack to supports the 3.5mm audio jack.
  • Confirm that the impedance of the speaker supports what the stereo requires. Commonly, receivers are rated between 4 ohms to 16 ohms. The majority are however between 4 – 8 ohms. It is important to match the speaker impedance to that of the receiver system to avoid ruining the system or getting an awful sound performance.

How Do I Turn My RCA into Aux?

There are many options for converting your RCA to an Auxiliary port. If you don’t have access to auxiliary ports, look into using a Bluetooth receiver with red and black speaker wire instead.

Some of the best ways to do it include:

  • Using a BlueRigger RCA to Auxiliary Cable. This is an extremely reliable solution that can be found on Amazon for around $15.
  • Use the headphone jack from your stereo system, or buy one online for cheap if you don’t have access to your current unit. To plug it in, just cut off the head of each wire and attach them to any free holes inside. You may need some extra connectors for this method depending on how many speakers you have plugged in at once. Make sure there are no empty spaces when done wiring everything up!
  • If you want to get fancy with things, try using a Dremel tool with sanding paper attached, then use pliers to mold the sanded wires into a plug that you can use to attach them.

How Do You Solder a 3.5 mm Stereo Plug to a 2-wire Speaker Wire?

Here are the simple steps to follow:

  1. First, hold the left positive wire to the tip connection and touch it with the soldering iron until the wire and connection are hot.
  2. Second, touch the solder to the connection until one drop of solder melts off.
  3. Thirdly, remove the solder and the iron.
  4. Finally, repeat for the right positive and the joint negative connections.

If you want to go a bit further, check out these articles:

Does a 3.5 AUX Cable Carry a 5.1 Surround Sound Signal?

Can I Connect a 5.1 Speaker with a 3.5 mm Jack to My TV?

Share This Article
Norvan Martin is the founder of He is a professional Electronics Engineer and is passionate about home theater systems and AV electronics. BoomSpeaker was created as an online hub to share his knowledge and experiences as it relates to home theaters and home audio electronics. My email: [email protected]  Connect on Pinterest and Linkedin