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Tiny 28mm metal speaker cone with wires, 4.5mm high, lightweight silver finish

Adafruit

Adafruit Mini Metal Speaker 8 ohm 0.5W 28mm

SKU CH-K88T-18M13

A compact 28 mm metal speaker rated at 8 Ω with a maximum input power of 0.5 W, suited for small audio projects

  • TypeEngineering Development Tools
  • Tiny 28 mm cone adds audio to compact projects
  • Light 6 g metal body keeps weight low in portable builds
  • 8 Ω impedance matches common amplifier boards directly
  • Rated for 0.25 W continuous with 0.5 W peak handling
  • Frequency range from 600 Hz to 10 KHz covers voice and alerts

Compact 28 mm metal speaker for micro-projects

This 28 mm diameter metal speaker is built for small audio projects that require an 8 Ω load and 0.5 W maximum input. Its 6 g metal body keeps weight to a minimum while fitting into tight enclosures. The driver works well with a Wave shield or class D amplifier board. It is suited for hobbyists adding simple sound to portable builds.

Low heat and silent operation at rated power

At the rated 0.25 W input the speaker produces negligible heat and no audible mechanical noise. The metal frame acts as a modest heatsink across the -20 °C to 55 °C operating range. Current draw stays small, so battery-powered designs see minimal impact on run-time.

Sustained 0.5 W peaks need careful gain staging

The 0.5 W maximum input can be reached only briefly; continuous operation at that level risks overheating the voice coil. Class D breakouts capable of 1.7 W must be gain-limited and started at low volume to avoid damage. Frequency response holds between roughly 600 Hz and 10 kHz during extended use.

Highlights

  • Tiny 28 mm cone adds audio to compact projects
  • Light 6 g metal body keeps weight low in portable builds
  • 8 Ω impedance matches common amplifier boards directly
  • Rated for 0.25 W continuous with 0.5 W peak handling
  • Frequency range from 600 Hz to 10 KHz covers voice and alerts

Specifications

TypeEngineering Development Tools

Questions about this item

How do I connect the pre-attached wires to an amplifier board without overdriving the 0.5 W limit?

Solder the two wires to the amplifier output terminals, observing polarity if marked. Start with the volume low and increase slowly; the class D amp breakout can deliver 1.7 W, which exceeds the 0.5 W maximum and will blow the cone if driven hard.

What long-term care does the metal cone need in a portable project?

The speaker has no user-serviceable parts. Keep the cone free of dust and moisture, avoid pressing on the diaphragm, and stay within the -20 °C to 55 °C temperature range. If distortion appears after extended use, the voice coil may have overheated and the unit should be replaced.

At what point does the 0.5 W thermal limit appear during continuous playback?

The rated input power is 0.25 W and the absolute maximum is 0.5 W. Sustained operation at or above 0.5 W will overheat the voice coil, causing permanent damage. Run at lower average levels and monitor for distortion, which signals the thermal limit has been reached.

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