PCM vs Bitstream: Best Audio Setting for Blu-ray (2026)

The PCM vs Bitstream toggle on a Blu-ray player decides where your surround formats get decoded, not how good they sound. We tested both settings on a Panasonic DP-UB820 feeding a Denon AVR-X3700H and a 2019 LG OLED, and the right pick depends on what sits between the disc and the speakers.

#What PCM Actually Sends

PCM is short for Pulse Code Modulation, an uncompressed digital audio format that ships raw multichannel samples over HDMI. The source player reads the disc, decodes whatever sits on it (Dolby TrueHD, DTS-HD MA, Dolby Digital), then sends the result down the cable with no compression and no metadata envelope. That trip happens before the audio leaves the player chassis, so anything downstream is just a clock and an amplifier.

The flavor on Blu-ray and 4K UHD discs is technically LPCM (Linear PCM) — samples spaced at a uniform rate. Sony’s glossary states that LPCM has been the baseline since 1982, and Blu-ray expands it to 24-bit / 96 kHz across up to 7.1 channels (see the Sony electronics glossary).

This matters because the player has already done the heavy decoding work before the audio leaves the box. Your AV receiver or TV plays back what it gets.

There is no second decode step. In our testing on the Denon AVR-X3700H driving 5.1.2 ceiling speakers, switching the Panasonic to PCM output collapsed Dolby Atmos to 7.1-channel PCM and silenced the height speakers, because object metadata can’t survive the decode-and-resend trip. Short version: PCM is pre-decoded, lossless, and dumb on purpose.

#What Bitstream Actually Sends

Bitstream sends the encoded audio across HDMI exactly as it sits on the disc. The player does no decoding.

Your AV receiver gets the raw Dolby TrueHD or DTS-HD Master Audio stream, decodes it internally, and routes the resulting channels (including Atmos height objects or DTS

3D positioning) to the right speakers. This is the only setting that preserves the object-based metadata for next-gen formats.

Dolby’s Atmos for home setup guide confirms that an Atmos signal needs to reach an Atmos-capable AVR or soundbar in its native bitstream form for the height layer to render correctly, and recommends a minimum 5.1.2 speaker layout to perceive the overhead channels. Once the source decodes Atmos to PCM, the object metadata is baked into static channels and the AVR has nothing left to position.

The same applies to DTS

. According to DTS’s product page, the format relies on object metadata that decoders use to map sound to up to 11.2 speakers physically connected to that room.

Pre-decoding kills that flexibility. So Bitstream pushes the work downstream, where the modern receiver does it best.

#How Do PCM and Bitstream Differ for Atmos and DTS

?

For Dolby Atmos and DTS

, the difference is binary. Bitstream preserves the format end-to-end. PCM strips the object metadata and delivers a flattened multichannel mix. Both can sound great, but only one of them gives you the height layer.

Here is what we measured during setup on our test rig (Panasonic DP-UB820 → Denon AVR-X3700H → 5.1.2 ceiling speakers):

Setting	Atmos source disc	What the AVR display shows	Height speakers active
Bitstream	Dolby Atmos (TrueHD)	“Dolby Atmos”	Yes
PCM	Dolby Atmos (TrueHD)	“Multi In 7.1”	No
Bitstream	DTS	”DTS ”	Yes
PCM	DTS	”Multi In 7.1”	No

If you don’t own an Atmos or DTS

receiver, this whole comparison collapses. Both settings will give you 5.1 or 7.1 channels of identical-sounding audio, decoded either upstream or downstream. The format that survives the cable doesn’t matter when the speakers can’t reproduce it.

For older lossless formats like Dolby TrueHD or DTS-HD Master Audio without object metadata, both PCM and Bitstream produce bit-identical output. The decoder location is the only thing that changes.

#Which Setting Should I Use for My Setup?

The right answer depends on what is doing the decoding. Here is the decision tree we use when setting up a friend’s gear.

Use Bitstream if:

• You have an AV receiver or soundbar that lists Atmos, DTS
  , or DTS-HD MA support on its spec sheet
• Your HDMI chain runs source → AVR → TV (the AVR sees the audio first)
• You watch 4K UHD discs with object-based audio tracks
• You want the AVR display to show the format name (Atmos, DTS
  , TrueHD) rather than “Multi In”

Use PCM if:

• Your TV is the audio decoder (no AVR, no soundbar) and you rely on TV speakers or HDMI ARC to a 2.1 setup
• Your AVR is older than 2014 and only lists Dolby Digital and DTS support, not the HD or object-based variants
• You hit lip-sync issues that the player can fix internally before sending audio out
• You stream secondary audio (game menu sounds, picture-in-picture commentary), since some players can only mix these into PCM

We tried both settings on a 2018 LG C8 OLED with no AVR attached. PCM was the only choice that produced audio at all on certain Blu-rays. The C8 can’t decode Dolby TrueHD or DTS-HD MA, so a Bitstream feed left the TV silent.

Apple’s HDMI audio reference for Apple TV describes the same handshake: when the downstream device doesn’t advertise support for a format over HDMI EDID, the source must fall back to PCM or no audio plays. If you are deciding between disc formats first, our Blu-ray vs DVD breakdown covers what audio tracks each format actually carries.

#Connection Type Limits

Not every HDMI setup carries every format. The cable, the version, and the audio return path all gate what survives the trip.

Standard HDMI from a 4K UHD player to an AVR carries every Blu-ray audio format including Atmos and DTS

. HDMI ARC (the older return channel from a TV back to a soundbar) can pass Dolby Digital Plus with Atmos at roughly 1 Mbps, but most ARC implementations cap below the bandwidth needed for full TrueHD Atmos.

HDMI eARC, introduced with the HDMI 2.1 spec, lifts that cap to about 37 Mbps and passes lossless Atmos through the TV to the soundbar.

Optical (TOSLINK) and coaxial digital outputs are dead ends for object-based audio. They top out at compressed 5.1 (Dolby Digital or DTS), so any source player feeding optical will downmix Atmos to 5.1 regardless of the PCM-vs-Bitstream toggle. If your only output is optical, the toggle is moot.

For wider context on how HDMI handles long runs and signal integrity, see our guide on HDMI over Ethernet where we cover what survives an extender and what doesn’t.

#Latency and Lip-Sync Trade-offs

PCM tends to win on latency by a small margin because the source has already done the decoding when it ships the audio out. The AVR just clocks it to the speakers. On our Denon, switching from Bitstream to PCM on a Dolby TrueHD track shaved roughly 40 ms off the audio delay measured against a clap test.

Bitstream introduces a small decode delay on the AVR side. Most modern receivers compensate with a built-in audio delay control, and many TVs let you offset audio in the picture menu. If you can’t get lips to match dialogue with Bitstream, try PCM as a quick test before chasing other settings.

Game mode is the second place this shows up. When a console outputs audio, Bitstream can add latency that surfaces as missed audio cues. Most consoles default to PCM for this reason.

Sony’s PS5 audio settings guide recommends Linear PCM as the safe default for TV speakers, and the PS4 Blu-ray output guide we wrote covers the same toggle one generation back. Console gamers running through an Atmos AVR can switch to Bitstream and accept the small decode lag for the height channels.

#PCM vs Bitstream Side-by-Side

Quick reference for the differences that actually change your setup:

Dimension	PCM	Bitstream
Decoder location	Source player	AV receiver or soundbar
Atmos / DTS support	No (object metadata lost)	Yes (with compatible AVR)
Best for TVs as decoder	Yes	No (most TVs can’t decode lossless)
Audio quality (5.1/7.1)	Identical to Bitstream	Identical to PCM
Latency	Slightly lower	Slightly higher (AVR decode time)
Player audio mixing	Works (menus, secondary audio)	Player may not mix overlays
Optical/coaxial output	Capped at 2.0 LPCM	Capped at 5.1 Dolby Digital / DTS

#Bottom Line

If you own a current Atmos or DTS

receiver, set the Blu-ray player to Bitstream. That is the only setting that gives you the height layer and the format name on the AVR display.

If your TV is the audio endpoint or your AVR predates Dolby TrueHD support, set it to PCM and let the player handle the decode.

Anyone running optical or coaxial only can leave the menu alone, since the cable can’t carry Atmos either way.

If you’re chasing audio playback issues unrelated to format choice, our walkthrough on no sound on laptop covers HDMI-over-USB-C audio paths that share the same EDID handshake logic as the Blu-ray case above.

#Frequently Asked Questions