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Description: A small audio speaker that is ideal for radio and amplifier projects and is small enough to fit in robot projects.


  • Small Size
  • Power rating: 0.5W
  • Impedance: 8 ohm

Dimensions: 50mm diameter, 16mm high, 28mm base diameter

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Customer Comments

  • Kinda surprised that Spark Fun has so few speaker choices in their catalog.

  • Anyone who has any feedback on the audio quality of this?

  • This speaker is 8Ω, .5W. What exactly does that mean? If I was to power this with a 3.3V supply, would I need extra resistance to meet those values?
    3.3V and .5W = ~22Ω, so would adding a 15Ω resistor be the way to go?

    • The speakers provide 8 ohms of resistance (by far the most common value, though there are 4 ohm and 2 ohm speakers out there), and can handle amplified audio signals up to 0.5W of power (i.e. very little – many consumer home stereos provide hundreds of watts of power).

      Typically you would not hook this up to, say, the PCM output of an Arduino directly. You would amplify the signal somehow. One common way would be to use a simple, cheap power amp chip like the LM386. If you Google “simple LM386 amplifier” you will find tons of examples that only use the chip and a handful of resistors and capacitors, so this is a very straightforward project. And if you include a potentiometer in the right spot, you will get a volume knob.

      A headphone amp should be enough to drive a small speaker like this, so if you want to hook this up to some sort of audio out board or device, anything that supports hooking up headphones directly ought to work as well.

  • I can’t get any sound from this when driven by your TPA2005D1 little mono amp but the little amp drives your 0.25 watt “thin speaker” very well. They are both 8 ohm but there is a much larger magnet on the 2". Is that the reason?

    • The mono amp shouldn’t have a problem driving either of these speakers, or larger ones. It sounds like your 2" speaker may be defective; contact our tech support department, they’ll be happy to help you out.

  • I connected two of these to a LilyPadMP3 and it’s playing really quietly. The LilyPadMP3 is powered with a 3.7V Lipo. Is there a way to make it a lot louder? I’m hiding the speakers in a skirt so it would be great if the solution was small. I’m quite a newbie, thanks for your help.

    • Honestly, I wouldn’t recommend this speaker if your expecting good/loud sound. I got a larger version of this form-factor speaker, and it sounded terrible, not to mention quiet and distorted. Instead, try a mini-speaker from parts-express, they should have much better sensitivity and therefore much better loudness than this one. Also if possible, try making a little enclosure for it, as it may help push out the volume, by isolating the back-side (comb filtering) and giving the speaker a tighter airspace to push harder with.

      Speaker examples: “Dayton Audio CE Series CE52P-4 2” Paper Full Range Driver" or “Tymphany TC10FG00-04 4” Full Range Driver"

  • How loud are these speakers? How many decibels would they be max? (I’m using a 10K linear rotary pot and the mono audio amp breakout board. Also, are there any tips for making this louder? Here’s the link I’m building from. Thank you!

  • That’s maybe a stupid question but I am working on doing the same than you did here how did physically connect the Audio amp with the speaker ; which kind of cable/header did you use with this speaker ?

    Thank you very much :)

  • could a bunch of these be used in conjunction with the STA540 audio amp? I’m thinking of putting together a DIY guitar/keyboard amplifier & perhaps create/store/use custom audio FX by adding an arduino or Rasp. Pi

    does that sound doable?

  • Hi. Is there any datasheet for this speaker?

  • Could I just drive this with a mosfet instead of a speaker amp? I’ve had success PWMing headphone speakers from my arduino to make tones, but I don’t know how well it’d scale up.

  • How do you mount these speakers to anything, since they don’t have holes?

  • Hi guys,

    For the ones who have tested them, how are the bass in them? I’m planning to buy these for some homemade headphones and wundered if they would be able to create some good debt?

    Thanks and looking forward to hear from you Mads

    • wundered if they would be able to create some good debt?

      If you buy two, that means they would create a debt of $3.90… ;-)

  • Excellent speaker! I’ve been using these for my Arduino based Alarm clock (Xronos Clock) and they sound excellent, no distortion and pretty loud. Trick to get more volume is to put them in enclosure with 3mm holes in front of membrane. It wasn’t intentional, but I got amazing amplification from this.

  • What are it’s dimensions?

  • Amps = watts/volts.

  • If I wanted to take one (or two) of these speakers and use them as output from a 1/8" stereo jack, would that be possible?

  • Any plans on getting these back in stock soon, or have they been replaced/discontinued?

  • Why doesn’t this item pop up when I search up “speaker” or “audio”?

    • When I search for “speaker” this is the first thing that comes up. But, like you said, “audio” doesn’t make it appear.

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