Redbox RB-LU4 - Uncategorized Sonifex - Free user manual and instructions
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| Product Type | 4-Channel Loudness Meter |
| Brand | Sonifex |
| Model | Redbox RB-LU4 |
| Dimensions (W x H x D) | 482 x 44 x 200 mm (1U, 19-inch rackmount) |
| Weight | 1.2 kg |
| Power Supply | 12V DC via external adapter (included) or PoE (Power over Ethernet) |
| Power Consumption | < 10W |
| Audio Inputs | 4 x balanced XLR (analog), 4 x AES/EBU (digital) on XLR |
| Input Impedance | >10 kΩ (analog), 110 Ω (digital) |
| Loudness Standards | ITU-R BS.1770-4, EBU R128, ATSC A/85, OP-59 |
| Display | High-resolution color TFT LCD |
| Measurement Range | -70 to 0 dBFS (digital), -20 to +20 dBu (analog) |
| Connectivity | Ethernet (PoE), USB (for firmware updates), GPI/O |
| Operating Temperature | 0°C to 40°C |
| Maintenance | Clean with soft dry cloth; no user-serviceable parts inside |
| Safety | Complies with CE, RoHS; use only supplied power adapter |
| Spare Parts & Repairability | Contact Sonifex support for spare parts; repair by qualified personnel only |
| Accessories Included | Power adapter, rack ears, quick start guide |
| General Information | Designed for broadcast monitoring; features loudness, True Peak, and short-term/ integrated measurements |
Frequently Asked Questions - Redbox RB-LU4 Sonifex
How do I set the loudness standard (EBU R128, ITU, etc.)?
Press the MENU button, navigate to Loudness Standard, and select your desired standard using the rotary encoder.
Can I connect analog and digital inputs simultaneously?
Yes, the RB-LU4 has four analog and four digital inputs. You can assign them independently per channel.
How do I reset the integrated loudness measurement?
Press and hold the RESET button for 2 seconds to clear all integrated values.
What power source options are available?
You can power the unit via the included 12V DC adapter or through Power over Ethernet (PoE) using a PoE+ switch.
How do I update the firmware?
Download the latest firmware from the Sonifex website, copy it to a USB flash drive, insert into the USB port, and follow the on-screen instructions.
What does the 'Over' indicator mean?
The Over LED flashes when the signal exceeds the selected threshold (e.g., -1 dBTP). You can adjust this in the settings.
Can I use the RB-LU4 with a 5.1 surround signal?
No, the RB-LU4 supports up to 4 channels (e.g., stereo or quad). For 5.1, consider the RB-LU6 model.
How do I calibrate the analog inputs?
Go to Settings > Input Calibration and apply a known reference level (e.g., 0 dBu = -18 dBFS) using the encoder.
Is the display brightness adjustable?
Yes, press MENU and select Display to adjust brightness and contrast for different lighting conditions.
What are the dimensions for rack mounting?
The unit is standard 1U height (44 mm) and 19-inch width (482 mm). Use the included rack ears for mounting.
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USER MANUAL Redbox RB-LU4 Sonifex
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Product information
Brand : Sonifex
Model : Redbox RB-LU4
Category : Uncategorized