# RAINCADE 雨

5.1 rain sounds: how to play real surround rain on your home theater

// 4 MIN READ

Surround audio

If you own a 5.1 system, you have probably tried playing rain through it and been let down. A stereo rain video comes out of the front two speakers, maybe smeared into the rears by your receiver's upmixer, and the subwoofer sits there doing nothing. That is not 5.1 rain sounds. That is stereo rain in a bigger room.

True 5.1 rain gives every speaker its own feed: different drops in every direction, a room that wraps around you, and thunder in the sub. Here is how to set it up and what to listen for.

What real 5.1 rain sounds like

A 5.1 system has six channels: front left, front right, center, the LFE channel for the subwoofer, and two surrounds placed beside and slightly behind you. With proper 5.1 rain:

  • The fronts and center carry what is in front of you: rain on the window or the windshield.
  • The surrounds carry the room and the outdoors behind you: the roof, the trees, the gutter off to the side.
  • The subwoofer carries the low end of thunder, the rumble you feel in the couch.
  • Every channel is different. No speaker plays a copy of another, so the rain stops coming from boxes and starts coming from the space.

That last point is what separates discrete 5.1 from an upmix. An upmixer takes two channels and guesses. It can widen things, but it cannot invent independent rain for the surrounds.

Step 1: set your computer to 5.1

Your operating system decides how many channels a browser can send. If it is set to stereo, everything downstream is stereo.

On Windows: open the Sound control panel (search for "Sound settings", then "More sound settings"), select your HDMI or surround output, click Configure, choose 5.1 Surround and finish the wizard. We have a full walkthrough in how to play 5.1 surround sound on a Windows PC.

On a Mac: open Audio MIDI Setup, select your output, click Configure Speakers, choose Multichannel and pick 5.1 Surround. Step by step in how to set up 5.1 surround on a Mac.

Step 2: check the connection

Discrete 5.1 needs a path that carries six channels of uncompressed audio:

  • HDMI straight from the computer to your receiver works best.
  • HDMI through a TV with eARC can carry multichannel audio. Plain ARC usually cannot carry six channels of uncompressed audio, so you may only get stereo that way.
  • A USB or PCIe surround sound card with analog outputs works too.
  • Bluetooth is stereo only. It will not do 5.1.

A quick check: look at your receiver's display while something plays. You want it to show multichannel PCM (often "Multi Ch In" or "PCM 5.1"). If it shows "PCM 2.0" or "Stereo", the computer is still sending two channels.

Step 3: use the right browser

For browser-based rain, Chrome, Edge and Firefox pass discrete channels through to the device. After changing your speaker setup, reload the page so the browser picks up the new channel count.

Step 4: test every speaker

Before you settle in, confirm the wiring. A speaker test walks a burst of noise around each channel in turn. If the left surround test comes out of the right surround, swap the cables or fix the channel map in your operating system. It takes 30 seconds and saves you a night of wondering why the gutter is on the wrong side.

Step 5: set the sub level

Thunder lives in the low end, and a subwoofer turned up for movies can make a close strike far too big for 2am. Start with the sub at your normal level and trim it down if the rumble feels intrusive. More on this in thunder sounds with real bass.

Speaker placement tips

You do not need a perfect room, but a few things help:

  • Fronts at roughly 30 degrees either side of where you sit or lie, center straight ahead.
  • Surrounds beside you and slightly behind, roughly 100 to 120 degrees from straight ahead.
  • Surrounds at or a little above ear height, so rain feels like it is coming from above.
  • If you listen in bed, aim the speakers at the bed rather than the couch.

5.1 rain in Retro Rain

Retro Rain was built for this. On a 5.1 device it renders six discrete channels (L, R, C, LFE, SL, SR) and places every drop, drip and thunderclap between the speakers in real time.

  1. Set your computer to 5.1 as above, then open Retro Rain and press PLAY. OUTPUT on AUTO picks 5.1 when the device reports six channels.
  2. Open OPTIONS, then ADVANCED. Press TEST to walk pink noise around every speaker.
  3. Use LFE.TRIM to set the sub, from minus 12 to plus 6 dB.
  4. Pick a place. The bedroom puts the window in front and a gutter to your front right. The car puts the roof right overhead. The tent puts thin fabric all around you.
  5. Drag the radar to turn your head inside the scene. The whole storm rotates with you.

Set SOURCE to REAL V2 and the rain comes from native surround field recordings made on five microphones, each played from the direction its microphone faced. The thunder is turned so its first rumble lines up with the lightning on screen.

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