Reusing Computer Speakers




Introduction: Reusing Computer Speakers

About: Writer, engineer, techie. I've been using computers since the original Apple II in 1978 and have always been interested in technical topics. Check out my articles on They include how-to...

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With all of the interest in my cassette boombox audio mod I decided to write up a complementary tutorial - reusing computer speakers. Modifying a boombox for an audio input is great for portable applications, but reusing a pair of computer speakers is more suitable for more permanent installations and cases where you need some physical separation between the left and right channels.

Used powered computer speakers are extremely inexpensive. They’re generally sold at yard sales and thrift stores for $5 or less, including their “wall-wart” power supplies. These speakers generally have permanent audio input cables with a 3.5 mm stereo (mini) plug which plugs into your computer’s line out port (typically color coded lime green).

These aren’t fantastic state-of-the-art speakers you’d want to use for a high end home theater system, but they’re decent, and certainly worth the price. Occasionally I’ll come across computer speakers with a subwoofer (a large speaker designed to replicate bass sounds) very inexpensively too. They’re called 2.1 (pronounced two dot one) because they have two main speakers plus one subwoofer.

There are many ways computers speakers can be reused – add stereo speakers to a DVD player, inexpensive amplified speakers for an MP3 player, a high quality speakerphone for your cell phone, and to add surround speakers to your computer to name just a few possibilities. Basically any piece of electronics with a standard 3.5 mm (mini) audio output jack can be used.

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Step 1: How to Hook Up a DVD Player

You can use a pair of speakers and an inexpensive adapter cable to upgrade your home video setup from mono to stereo.

Almost all DVD players, Blu-Ray players, and stereo VCRs have a trio of color-coded output jacks. They’re typically colored yellow, white, and red and correspond to Video, Left audio, and Right audio. The good news is different hardware and cable manufacturers all use the same color coding scheme. (It was much more challenging to hook up early VCRs and audio equipment before color coded standards became popular.) Red is also used on red/green/blue colored cables for component cable setups and yellow is also often used for digital audio (SPDIF) so you’ve got to be careful not to confuse them. Other than that all you have to do is match colors to avoid confusion when hooking up cables.

An inexpensive Y-adapter cable with white and red RCA plugs on one side and a female 3.5 mm stereo plug on the other end is all you need to hook up most computer speakers to your DVD or Blu-Ray player or stereo VCR.

Some mini stereo plugs and jacks are color coded lime green, but this isn’t always the case. In most cases, including most adapter cables, the 3.5 mm plug is the same color as the cable (beige, black, and white are common).

In a typical setup your TV set is hooked up to the DVD player with either a direct cable from the DVD’s video out to the TV’s video in jack or through an R-F modulator to the television’s antenna jack. If a mono TV has input jacks they will be color coded yellow (video) and audio (white).

If the red and white audio out jacks on your DVD player are not in use then hook up the Y-adapter cable and plug in the speakers. Presto, you’ve got the equivalent of a stereo TV and added a new dimension of experience to your DVD watching enjoyment.

Step 2: Mono and Stereo at the Same Time

If you’ve already got an audio cable hooked up from the DVD player to the TV set you’ve got a couple of choices. You can disconnect the audio cable from the DVD player to the TV and hook up your computer speakers (no sound will come out of the TV’s speaker), or use a splitter so the mono audio still goes to the TV while the stereo audio goes to the speakers. An inexpensive RCA Male to two RCA Females splitter will do the job. (An adapter changes one type of connector to another while a splitter takes a signal and splits it into two identical signals.)

My preference is to use the splitter because it gives extra flexibility. If I’m just watching an ordinary DVD then I’ll just use the TV’s built-in speakers and leave the speakers unpowered. But if it’s an action movie with lots of audio effects or a musical I’ll turn on the external speakers.

The first photo shows a gray colored splitter cable plugged into the DVD player’s white (left/mono) audio jack. The white cable from the adapter is plugged into the splitter and the red cable on the adapter is plugged into the red audio output jack (hidden underneath the gray splitter cable in this photo). The speakers are connected to the other end of the adapter. The other half of the splitter sends the left audio channel to the television, along with the existing yellow (video) signal.

Hooking up external speakers to your DVD player has an added bonus; the DVD player can also be used as an audio CD player. Just leave the TV set powered off. Put an audio CD into your DVD player and you can listen to CDs through the stereo speakers.

Step 3: Other Uses

Another use for computer speakers is amplified speakers for an MP3 player. Just plug the speakers into your MP3 player and you’re ready to listen to music without headphones.

My cell phone has a 3.5 mm audio jack. When it’s plugged into speakers it can be used as a speaker phone or listen to a podcast. The phone’s built-in anti-echo circuit does a great job of eliminating feedback. If your cell phone doesn’t have a mini jack you can probably obtain an adapter cable.

Step 4: Surround Sound on Your Computer

Many high end computer sound circuits have the capability to hook up extra speakers for a surround sound setup. In some cases the jack is marked “Rear/Line In” or just “Line In” and that jack serves dual purposes. Depending on how your sound circuit is configured the jack can either take audio into your computer (Line In) or send out audio to a pair of rear speakers. In other cases there’s a separate jack marked “Rear”, and possibly an additional jacks for Center/woofer and side speakers for a 5.1 or 7.1 audio setup. Check your sound card’s documentation for details.

This figure shows the jacks on my ASUS motherboard (unless you’ve got a similar motherboard the jacks will probably have a different arrangement). Jacks 5, 6, 14 are the standard line in (light blue), line out (lime green), and mike (pink) jacks. Jacks 3, 4, and 15 correspond to the side, center/woofer, and rear speaker jacks. Since this motherboard also has digital audio outputs (17 and 18) it can hook up directly to a home theater system.

Step 5: Final Thoughts

I pick up used speakers at yard sales whenever they’re inexpensive enough because they are so versatile. I’ve paired them with MP3 players as presents, helped friends upgrade their DVD setups to stereo, and set up one unit in a laboratory so anybody could hook up an MP3 player if they wanted background music while they worked.

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    10 Discussions

    Zen Innovations
    Zen Innovations

    2 years ago

    I sometimes use these signal spiltters to combine various 2.1 Speaker sets into a pseudo 4.2 or 6.3 system. The sound quality is very nice.


    3 years ago

    I have a few of these reused setups around my house.I didn't pay more than$6 each.But I only buy the ones with internal power.
    A JBL system in my workshop with an old android phone as an internet radio/dlna reciever with an added usb charging port.

    An Altec Lansing system in my garage with a Bluetooth a2dp reciever wired inside it,$12,30 watt stereo Bluetooth system.

    And a nice Logitech system that's going out on my deck,internal Bluetooth of course,as soon as its done.
    The price is right!


    4 years ago on Introduction


    I need your help. I want to add wire to my existing mini stereo speakers so I can put them on top of the entertainment center instead of right next to the stereo amp. I have speaker wire and I have 22-16 butt splice pieces. I will have to strip the wires at both ends, insert into butt splice and really crimp them hard to get them to stay in there nice and solid. My question is what do I use to make a good solid crimp. Wire strippers or something else. When they are attached to the stereo they just go thru a hole and close the pin and they are attached.

    I would appreciate your help on this because I don't want to mess up the butt splices.

    Thank you in advance for any help you could give me.



    5 years ago on Introduction

    I don't get this. It's like an instructable on spoons and how to eat soup or ice cream with them.


    Reply 5 years ago on Introduction

    Maybe for you, but not for others. I've shown many friends how to use used computer speakers to add stereo to a DVD player, a speakerphone for a smartphone, etc. and they've all appreciated the information instead of making a snide comment about teaching them how to use a spoon.

    Also, an extremely high-tech gamer friend was astonished when I suggested that he add a pair of speakers to his computer for surround sound - it just never occurred to him!


    Reply 5 years ago on Introduction

    To me it's really pushing the limits of spam,trying to get everyone here,and also anyone who may link to here,to redirect them to neatinfo for web traffic revenue.


    6 years ago on Introduction

    Great instructables, I've picked some really cheap and great speakers on goodwill stores and yard sales.
    As a tip: some old compaq speakers (around 95 to 99) have JBL 4ohm drives on them.
    Im actually building a hi-fi stereo amplifier using 2 brideged Tda40 IC's for running 6 of these speakers.


    8 years ago on Introduction

    I totally agree with you -- used pc speakers are the best buy out there for low-cost audio, and I've picked them up used for as little as $5. Not only do I used them on my computers, but on a dedicated internet radio, an mp3 player, and for the audio on a talking robot head that I built. They can also be disguised, as in an instructable I did some time ago:

    Nice job on the instructable!


    Reply 8 years ago on Introduction

    Thanks. I see them all the time at $5 - and at this point I think that it's too much(!). I've got about three spare pairs of speakers in my workroom ready for projects, so I only pick up additional ones if they're $3 or less unless they're extremely decent ones.

    I did pay $4 for the 2.1 subwoofer + 2 speakers I mentioned in the instructable, but only because it had the subwoofer and had two sets of inputs.