PCM vs Bitstream For Soundbar

PCM vs Bitstream For Soundbar

The PCM vs Bitstream decision for a soundbar differs from the standard PCM vs Bitstream discussion, as the introduction of a soundbar in our technical landscape obliges us to make decisions in relation to the enablement of Dolby Atmos and the channels of the soundbar (2.1 vs 3.1 and over, for example)

The settings here do not depend only on the soundbar you have. We need to analyze the entire landscape architecture, which encompasses the emission of sound and the data layer.

Let´s see

Neither Bitstream nor PCM is universally preferred for every soundbar. Choose the format that preserves the soundtrack and is supported by the complete path: source, TV, HDMI ARC/eARC or optical connection, and soundbar.

Dolby Atmos can reach a soundbar as a Dolby Digital Plus or Dolby TrueHD bitstream, but it can also arrive through Dolby MAT, which combines lossless PCM audio with Atmos metadata. On a compatible TV, Auto or Pass-Through is usually a better starting point than a blanket “Bitstream” rule.

For games, Linear PCM is a good choice for decoded game audio when the console, TV path and soundbar support the required channels. If you want native Dolby Atmos from a PS5 or another current console, select its Dolby Atmos output and verify that the complete HDMI path supports it.

For Blu-ray and Ultra HD Blu-ray, Bitstream Unprocessed is useful when you want the soundbar or receiver to decode Dolby TrueHD/Atmos or DTS formats. PCM is also valid when the player performs the decoding and the connection can carry all channels; disable secondary-audio mixing when you want the original Atmos bitstream.

PCM can carry full multichannel audio; it is not reserved for 2.1 systems. The common stereo limitation comes from a particular TV or from ARC or optical implementation, not from PCM itself. HDMI eARC supports uncompressed 5.1 and 7.1 audio.

Bitstream forwards an encoded format for downstream decoding when the TV and soundbar support it. It does not enable Auto Low Latency Mode or Variable Refresh Rate: ALLM and VRR are separate HDMI video features. Connecting a console directly to a compatible TV may preserve those features, but the audio-format menu is not what activates them.

For a 2.1 soundbar, stereo PCM is often sufficient, while Bitstream, Auto or Pass-Through is useful if the bar decodes a desired Dolby or DTS format or virtualizes Atmos. For 3.1 and larger bars, multichannel PCM over HDMI eARC can be just as valid as Bitstream.

Internal streaming apps can use a different audio path from an external HDMI source, and Pass-Through may be available only for external devices on some TVs. Check the format shown by the soundbar and change settings only if channels, Atmos, sync or compatibility are wrong.

PCM Or Bitstream For 2.1 Soundbar

For a 2.1 soundbar, begin with PCM for conventional stereo or with Auto or Pass-Through when the soundbar supports the encoded format you want. There may be an audible difference if one choice triggers downmixing, transcoding or Atmos virtualization, so verify the received format rather than assuming the options are identical.

For 3.1 channels and above, do not reject PCM automatically. Use multichannel PCM when the entire HDMI eARC path supports it; use Bitstream when you want the soundbar to decode a compatible encoded soundtrack.

For a focused 2.1 setup, see our PCM or Bitstream for a 2.1 soundbar guide.