Sony ECM-W5: goodbye to cables and blown-out audio

A backup in the mic, float in the file

For those of us who shoot Sony, the ECM-W5 does two things the ECM-W3 didn’t. Each mic records its own backup, and the receiver puts 32-bit float audio straight into the video file through the MI Shoe. On the FX5 that already works, as it does on the a7R VI and the a7 V with firmware 2.00+. And on the FX5, timecode also comes in over USB-C.

The facts

Sony announced it on October 14, 2026. The kit comes with two mics (TX), a receiver (RX) and a charging case. Sony says it’s designed to resist dust and moisture, but it isn’t waterproof or splash-proof, and Sony doesn’t publish an IP rating.

Microphone (TX)

• Body: 31.0 × 47.0 × 22.3 mm and 27.1 g (1.0 oz). It goes on with the clip or with the magnet inside the clothing.
• Audio: omni and mono, 20 Hz to 20 kHz (up to 40 kHz when recording at 96 kHz). Sensitivity of −40 dBFS (0.1 Pa, 1 kHz), self-noise of 21 dB SPL or less, max SPL of 124 dB (1% distortion) and dynamic range of 103 dB or more. Wind noise is 47 dB SPL or less without the windscreen and 30 or less with it.
• Lav input: 3.5 mm mono with a locking ring and plug-in power. A stereo lav gets mixed down to mono. If you plan to use your own lav, test it before the shoot.
• Battery: built-in Li-ion at about 3.7 V, drawing 0.32 W. Up to 11 h per the Help Guide (in 2TX, close to the receiver and with no interference). It charges in 55 min, and 5 min gets you about 2 h.
• Storage: 64 GB, up to 90 h at 32-bit float/48 kHz or 60 h at 24-bit/96 kHz, saved in folders by date. Sony doesn’t publish the file format.
• Radio: Bluetooth 6.1 with frequency hopping. It reaches up to about 500 m with the mic upright, facing the receiver and in sight, and less with obstacles. Sony cites low latency, without a figure, and about three times more stable transmission than the W3’s, by its own measurements. Don’t cover the antenna, which sits on the bottom by the serial number label. The LINK light is blue when linked to the receiver and blinks faster as the link gets worse.

What each function does on set:

• REC, AUTO REC and TX LINK: REC records to the mic and to whatever’s connected. AUTO REC starts recording as soon as you turn the mic on, so you don’t depend on someone remembering to hit REC. TX LINK starts all the mics at once.
• REC AUDIO SET.: the backup records at 32-bit float/48 kHz (default), 24-bit/48 kHz or 24-bit/96 kHz. 96 kHz only works in 2TX with a compatible camera set to 24 bit/96 kHz, and it goes back to default when you take the receiver off and power down.
• REC LC/NR FILTER: in RAW the backup records clean, with no low cut or NR, and you decide in post. In SYNC it carries the same filters you send to camera, so both files sound the same.
• OVERWRITE REC: set to ON, it records over the oldest files when the memory fills up. Set to OFF, it stops and protects what you already have. If you’re not offloading every day, leave it OFF.

Receiver (RX)

• Body: 53.5 × 17.8 × 37.5 mm and 35 g (1.3 oz) without the MI Shoe adaptor. AMOLED touchscreen and a control wheel.
• Connectors: a 3.5 mm output that feeds the camera’s mic input, a 3.5 mm input for an external mic, and USB-C. Per the Help Guide, both 3.5 mm jacks are stereo.
• Output and power: 2 analog channels or 4 digital. Up to 7 h on battery (with two mics, no external mic and output gain at 0), or it runs on power from the shoe. It charges in 55 min and draws 0.22 W.

What each function does on set:

• MODE SELECT: 2TX, 4TX or TWS MIC. For 4TX you add one or two ECM-W5T (sold separately) and set the shoe to DIGITAL. If you plan to record all four channels in camera, test it with yours first. Switching modes drops the link for a moment.
• Gain and filters: auto, or manual from −12 to +12 dB, and you can ride it even while recording 32-bit float. Per mic you get low cut, noise reduction (NR) and mute. NR turns off when the camera is set to 24 bit/96 kHz.
• Routing: in 2TX, an external mic on the receiver’s 3.5 mm input goes to CH1-2 or CH3-4, mixed or split. In 4TX you assign each pair of mics the same way, or mix all four.
• MISHOE SET.: set it to DIGITAL if your camera is in either of the first two groups under Cameras, below (the FX5 is in the first), and to ANALOG if it isn’t. DIGITAL is how the float and the four channels get in.
• POWER LINK: the receiver turns on and off with the camera, a few seconds later, and the mics follow the receiver. You turn the camera on and everything’s ready. It draws more on standby, and it stops following the camera if you use the CAM HP cable.
• Timecode: 23.98, 24, 25, 29.97 DF, 29.97 and 30 fps, in REAL TIME or COUNT UP. AUDIO OUT records it as audio. USB SYNC sends it over a USB-C to USB-C cable rated 5 Gbps or higher, and the receiver acts as a timecode generator for multicam. Right now only the FX5 takes USB SYNC.
• Monitoring: in 2TX you hear the mics wirelessly on Sony headphones with LE Audio, like the WF-1000XM6 or WH-1000XM6 (the WF-1000XM5 and LinkBuds S need updated firmware). Before pairing, turn on LE Audio in Sony | Sound Connect. Classic-only models, like the WH-1000XM5, can’t monitor. With CAM HP you hear the camera’s headphone output. There’s no monitoring at 96 kHz.
• TWS MIC and binaural: you record with the mic in compatible Sony headphones. It goes to CH1 and CH2, and over Classic Audio it’s mono only. You can’t use it while monitoring. Binaural will only work with the WF-1000XM6 on firmware 2.0.0 or later.
• USB adaptor: it goes on in place of the MI Shoe adaptor and connects the receiver to a phone or computer with USB Audio Class 2.0, also in 32-bit float.

Case and box

• Case: 77.5 × 51.0 × 94.5 mm and 174 g. It charges over USB-C in 150 min (rated 7.6 W), and Sony recommends a 5 V/3 A or higher adapter. It charges the units first and then itself, and holds about one full charge for each unit. Opening it puts the receiver in standby. You offload the mic files through its USB-C.
• In the box: two mics, the receiver with the MI Shoe adaptor attached, the case, USB adaptor, adaptor cap, two windscreens, two magnets, pouch and documentation. Sony notes it may vary by region. No lav and no 3.5 mm cable.

Cameras

• 32-bit float (at 48 kHz) or 24-bit at 96 kHz in camera: FX5, a7R VI and a7 V (the a7 V on firmware 2.00 or later).
• Digital, but no float or 96 kHz: FX3, FX3A, FX2, FX30, a7S III, a7 IV, a1 II, a6700 and others.
• Analog: a7 III, a6400 and others with the shoe set to ANALOG, or any camera with a mic input, over a 3.5 mm TRS cable.
• Restrictions: Sony marks every camera on the list “Compatible, but with restrictions”. On several, like the a7R VI, a7 V and FX2, you can’t adjust the recording level from the camera. On the FX5 and FX3 you may hear noise when monitoring through CAM HP, without affecting the recording. The ZV-1 shouldn’t power the receiver.
• Not on the list: the FX6 isn’t on Sony’s list.

Price and availability in Mexico

In the US it’s due in November. The kit is US$399.99, and the RX (US$189.99) and TX (US$119.99) are sold separately, without a case. With four mics, it comes to about US$640. In Mexico it already shows up on sony.com.mx, but with no price or date, and it’s not on sale at Sony Store México yet. When it arrives, buy it there with my discount codes sonycache and sonycache10.

The production read

On the FX5, the a7R VI and the a7 V (on firmware 2.00+), with the camera audio at 32-bit float/48 kHz and the shoe set to DIGITAL, the float goes inside the video file. Nothing to sync, and if the actor yells you pull the fader down in post. Heads up: float is 48 kHz only; at 96 kHz the camera records 24-bit. And Sony is clear that if it clips at the mic’s input stage, float won’t bring it back.

On an FX3, FX30 or FX2 it goes in digital but without float, and Sony doesn’t say at what bit depth. On those cameras your safety net is the mic’s backup, at 32-bit float/48 kHz by default, which you sync in post. The W5 swaps the W3’s SAFETY (which in MIX mode cut the right channel by 20 dB) for 32-bit float.

Outside the FX5, Sony documents timecode as audio (AUDIO OUT), on CH2 or CH4. With the shoe set to DIGITAL that leaves you three audio channels; on analog or over a cable, one. If your sound mixer brings their own timecode, run a sync test before day one.

With an external monitor-recorder, Sony talks about float in the camera file, not about the audio going out over HDMI or SDI. If your master is the recorder’s file, test it first.

My personal opinion — Daniel Blanco A.M.C.

Goodbye to cables, and to blown-out audio.

I already have it on my FX5, and the pairing makes complete sense. The receiver sits in the MI shoe, takes power from the camera and, with POWER LINK, turns on and off with it. Audio goes into the clip as 32-bit float, and with a short USB-C cable from receiver to camera, timecode comes in via USB SYNC: today the FX5 is the only camera that accepts it. When you cut, the float is already inside the file, with nothing to sync in post, and the backup stays in each mic. If you shoot on an FX5, this is the mic the camera was missing.

Before you buy

Look up your camera on Sony’s compatibility list. If you have an a7 V, update it to firmware 2.00 or later, as Sony asks. Sony’s announcement video is at the top of this post so you can see it working. To buy it at Sony Store México, use my discount codes sonycache and sonycache10. Which camera would you use it with? Let me know in the comments.

Photos: Daniel Blanco A.M.C. Images marked Sony come from Sony’s official announcement video.

Specs: ECM-W5 Help Guide, camera compatibility, compatible headphones and sony.com.mx. Price: Sony Electronics.

Original source: Sony