Power in-wall speakers with an HDMI audio extractor and cheap amplifier

Remember those in-wall speakers we mounted a while back? Well, now we’re going to need to power those things, and all we have for the source audio is the HDMI output coming from our HDMI matrix. So, we need two pieces: first, we’ll need to extract, or “de-embed”, the audio with this HDMI audio de-embedder – it allows you to pass through an HDMI signal and extract the audio signal via a stereo out cable (this particular model will also extract 5.1 channel surround-sound audio via an optical cable as well):

Now that we have the audio signal available on our stereo cable, we need to amplify the audio to power our in-wall speakers. For this I chose this inexpensive audio amplifier; it’s relatively cheap and uses a manual volume control so it doesn’t allow for a remote control to change the volume, but that didn’t bother me for this particular application.

… and that’s it! Now, any signal coming over HDMI will have the audio de-embedded, where it’s routed to an amplifier to power the speakers. And the HDMI signal goes straight through for the video to be displayed on another device – more on that in an upcoming post!

Posted by Matt Chiste
February 27
2 comments on “Power in-wall speakers with an HDMI audio extractor and cheap amplifier
  1. SCP says:

    I love these extractors, and combining it with a small desktop amp is really smart. But I’ve never figured out how to de-embed, amplify, and feed wall speakers for a 3.1 setup (left, right, center, sub) and keep it compact like this. It seems like your only options are (a) using a HT receiver with long speaker wire runs, or (b) the dreaded sound-bar. Any thoughts on how to scale this up to 3.1 and keep it minimalist?

    • Matt Chiste says:


      I looked for audio de-embedders that would pump out 5 channels, but didn’t have much luck.

      That said, that audio extractor will extract 5.1 channels via SPDIF. You could then dump that into a splitter like this one – http://amzn.to/1pzfuMJ – to get 5 channels of analog audio.

      Next, I looked for a desktop amp for 3.1 or 5.1 speakers and didn’t have much luck either – but there seem to be some options for powered speakers like this guy – http://amzn.to/1pRjmso (and in a strange feature, these have bluetooth connectivity to play in-wall music directly from your phone!).

      Hope this helps – feel free to ping me at matt@homeautomationguru.com if you’ve got other questions.

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