Want to turn your old speakers into a smart, wireless sound system?

The Dayton Audio WB40A is a compact but powerful amplifier that lets you stream music via Wi-Fi or Bluetooth to any set of passive speakers.

It delivers 2x20 watts RMS (into 8 ohms), which is plenty of power for a room-filling sound in your living room, bedroom, or office.

The coolest feature is the multi-room capability — using the free Hi-Fly app (for iOS/Android), you can group multiple Dayton Audio Wi-Fi devices together and play synchronized music throughout your home.

You can also stream from popular services like Spotify, play files from your phone or network drive, or even plug in a USB drive directly.

It supports AirPlay 1 and DLNA, and has a 3.5mm aux input, an Ethernet port, and Bluetooth for easy connectivity.

The included IR remote lets you control volume and sources without your phone.

Setup is straightforward with the app guiding you through Wi-Fi configuration.

Note: The included power supply supports up to 2x15W; for the full 20W per channel, you’ll want a 15V 3A power supply (sold separately).

With a sleek, low-profile design (4.5\ W x 1\ H x 4.5\ D), it tucks away neatly.

Whether you’re building a multi-room audio system or just want a versatile amp for your desktop speakers, the WB40A offers great value and modern features without the complexity.