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Ambient Lockit ACL204 Synchronizer Box

Ambient Recording
Abel Code: AMB-ACL 204
Mfr. Code: ACL 204
Estimated to Ship – 5-10 Business Days
Special Order Only
This is a special order item. You will be charged upon placing your order, which is non-cancelable and non-returnable.
Synchronize your cameras and audio recorders with the portable Ambient Lockit ACL204 Sync Box, which supports all SMPTE frame rates. It features ACN system support, timecode out offset, a sunlight visible OLED display, and runs on 2x AA batteries.
Key Highlights
  • Synchronize your cameras on set
  • Runs on (2) AA batteries about 30 hours
  • Portable, compact unit


The Ambient Lockit Sync Box with ACN offers wireless timecode, synchronizes your cameras and audio recorders, and supports all SMPTE frame rates. This highly accurate TC generator includes a daylight visible OLED display and can run off (2) AA batteries for up to 30 hours. Using Lockit in your workflow will save you both time and money.

For about 20 years, the Ambient Lockit is the market leading portable, timecode and sync generator worldwide. Like all Lockit devices, the ACL204 is based around a highly accurate, tunable, temperature compensated crystal for reliable synchronization of multiple devices without cables or fragile wireless transmission.

The ACN network generation adds even more accuracy and comfort to the Lockit system, while maintaining the renowned reliability. Surpassing the already comprehensive facilities of its predecessor, the ACL204 not only covers all timecode rates and sync formats, it also allows the user to apply an offset to the TC output to compensate for the processing delay created in most digital cameras. 3D camera rigs can be made lighter and neater by utilizing the 2nd TC output while the sync output can be switched to drive a dual load.


  • Highly accurate timecode generator
  • Generator buffered timecode transceiver
  • Drift of less than 1 frame a day (~0,1ppm, 0ppm within the ACN)
  • Supports all SMPTE frame rates
  • Supports all standard video sync and word clock formats
  • Sunlight readable OLED Display
  • Adjustable timecode offset
  • Dual Sync Mode, 2 TC Out for 3D use
  • Midi timecode interface with LTC/MTC conversion
  • Built-in ACN (Ambient Clockit Network) transceiver with internal antenna
  • RS232, USB port
  • Run time of 30 hours on (2) AA batteries
  • Robust machined and anodized aluminum body

ACN Continuous Jam System

A built-in ACN enables 0.0ppm drift, wireless timecode, and remote control. The ACN is a proprietary network technology. It delivers line-accurate syncing of your production cameras, while syncing picture with sound. Along with its innovative, time-saving metadata collection/management system and distribution of our world-renowned timecode, the ACN guarantees smooth, cost-effective workflow from the set to post-production.

The integrated transceiver and the second LEMO socket can be used to interface with an ACN system. It also allows the ACL 204 to work as a fully-functional, generator buffered wireless timecode transceiver. With firmware version 3.1 or higher, the new c-jam mode does not stop after the first jam. It will resend smaller timestamps every 4 seconds.

All receiving units now compare their internal generated timecode with the highly accurate timestamp and pull up or down the generator speed until they are perfectly matched. This way a drift between all ACN devices on set can be avoided completely. When used in a network with a Master Lockit, all ACL204 units and other ACN Lockits can be displayed, named and remote controlled via the Master Lockit web interface.

Timecode Transceiver

Furthermore the ACN enables devices to become a fully-functional timecode transmitter or receiver. With the highly accurate generator running in the background taking over in case of a connection loss, timecode drop outs are relics of the past.

Ports & Housing

The housing for the ACN-ML includes a bright blue face with abbreviations or icons next to the ports along the sides for fast reference in the field.

Ports include:

  • USB mini-B 5-Pin
  • LEMO 5-Pin Socket "B" for DC OUT
  • LEMO 5-Pin Socket "A" for DC IN

RED Digital Cameras

With firmware 4.1, all ACN-TL Tiny Lockit, ACL 204 Lockits, and ACN-ML Master Lockits are be able to read out and distribute metadata from RED Scarlet, Epic, and Weapon cameras that is then stored on a Master Lockit. The stored metadata can then merge with data generated by the Script Supervisor using the LockitScript app, and exported to post, or accessed via the Master Lockit's WiFi for DIT use.

Our RED protocol integration includes nifty feature which greatly simplifies the setup RED cameras and Lockits. When connecting the ACL 204 with the ACN-RCP cable to the CTRL port of the camera, the ACL 204 will automatically sense camera type, sync rate, and timecode frame rate – and match those settings. Then just connect the timecode / sync cable, and the RED camera is plug and play.

Computer Timecode & Sync Interface

Plugged in into a computer, the Lockit transforms into a highly accurate Midi Timecode Interface with LTC / Midi Timecode conversion. This enables ACL 204 to sync multiple cameras with a Pro Tools workstation.This is made possible by the ACL204’s flexible, fully programmable FPGA architecture.

A front loaded OLED display will give instant visual feedback about the current configuration and assist while moving through the menu to make adjustments. This is now done on the fly with an easy to operate one-finger navigation system – no more need for screwdrivers or powercycling the unit.

Timecode & Sync Settings without Mismatching

An intelligent algorithm will prevent configuration of improper, mismatched TC and Sync rates or unintended alterations to the setup. Still being an easy-to-use TC and Sync box at the core, and powered by 2 AA cells in the familiar rugged footprint, the ACL204 can be considered the pinnacle of portable synchronization.

Supported Standards - (SMPTE/EBU) - 23,976, 24, 25, 29.97, 30 fps, 29.97/30 drop frame

Sync Formats:

  • NTSC - 59.94i
  • PAL - 50i
  • 720p - 23.976, 24, 25, 29.97, 30, 50, 59.94, 60
  • 1080i - 50, 59.94, 60
  • 1080psF - 23.976, 24, 25, 29.97, 30
  • 1080p - 23.976, 24, 25, 29.97, 30, 50, 59.94, 60
  • World Clock - 32, 44.1, 48, 88.2, 96, 176.4, 192 KHz, pull-up / pull-down
  • Black Audio AES3 - 24-bit (sample rates as above)

Free-of-Charge LockitScript App

When you register your Lockit after purchase, you will receive a FREE license to Ambient's LockitScript App. One of the benefits of the LockitScript App is how your script supervisor can receive clip metadata information from your ARRI ALEXA or RED DSMC cameras, plus create reports, logs and notes to help speed up your post production process.

You can learn more about LockitScript App. Remember that you receive a free license with purchase of the MasterLockit.

NOTE: Batteries, cameras, and other accessories are sold separately.

What's in the Box

  • Limited 1-Year Warranty
  • Ambient Sync Box


Key Highlights

  • Synchronize your cameras on set
  • Runs on (2) AA batteries about 30 hours
  • Portable, compact unit
  • Adjustable timecode offset
  • Can interface with RED cameras
  • Free LockitScript App with registration
  • OLED display menu


Operating Time:
Approximately 30 hours with 2x AA batteries


Monitor Features:
Visible Outdoors (Daylight)
Monitor Type:


Power Input:
USB - 5.0 V DC
Battery Pack
LEMO 4-pin - 5 to 18 V DC (via LEMO A socket)


Recording Resolution:
1080p - 23.98, 24, 25, 29.97, 30, 59.94, 60
720p - 23.98, 24, 25, 29.97, 30, 59.94, 50, 60
1080i - PsF - 23.98, 24, 25(50i), 29.97(59.94i), 30(60i)
Recording Frame Rate:
NTSC - 29.97, 30 fps
PAL - 25 fps


Drift Notes:
Drift of less than 1 frame a day - (~0,1ppm, 0ppm within the ACN)
Timecode Options:
Sync/Timecode Generator


6 in
2.4 in
9.8 in
1.2 lb
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