REAC: Benefits and Power
The REAC (Roland Ethernet Audio Communication) protocol enables up to 40x40 channels (80 total) of audio at 24-bit/96Khz to be transfered across a single Cat5e cable. The superior quality and reliability of Roland Digital Snakes is made possible by coupling high quality preamps with REAC digital transmission technology. Roland Digital Snake systems are immune to the hums, buzzes and general impedance and capacitive losses that plague analog snakes. By having the mic preamps close to their source and by avoiding the transmission losses of long runs of analog cables, your audio has a chance to sound its best throughout your whole system. The system provides superior clear sound, great intelligibility with minimum latency and the freedom to easily split or extend your source audio. Digital Snakes are the next generation of audio quality for concerts, corporate events, houses of worship and any kind of audio installation.
High Quality Pre-amps on each input channel
In an analog system, low-level microphone signals are boosted using a mic preamp only after the long, arduous journey down the analog snake. For this reason it’s difficult to avoid degradation and cross talk. The digital snake is equipped with high quality and remote controllable pre-amps that boost the input gain very close to the source, where the highest quality signal is found. This ensures that your audio will sound its best. And of course once the signal is in digital form, it is immune to analog cabling losses. The pre-amp has been specially designed for live audio applications and is made of high quality components carefully selected by Roland’s engineers.
High quality and low noise digital transfer
In the analog domain, it is impossible to avoid signal degradation during long distance audio transfer at concerts or events in large halls or arenas. Digital transfer of REAC provides extremely flat and pure audio transfer for the whole frequency bandwidth. Furthermore, additional audio benefits occur because the source signal is transferred after boosting the gain using the high quality and remote controllable mic pre-amps.
Minimize a signal’s damage due to “noise pollution”
Hums and buzzes from external noise sources can often be a problem for analog snake installation. It can be difficult to know where potential noise sources might be before installing a snake. Solving subsequent noise problems requires alot of experience and time. REAC provides an effective solution to these installation problems. Technically, the risk of noise pollution such as the induction of hums and buzzes into a digital snake is much lower than in an analog snake, and cross talk is minimal or non existent. This provides almost complete routing freedom for your cable installations.
Roland’s original Ethernet technology
REAC (Roland Ethernet Audio Communication) is newly designed technology for digital audio transfer by Roland. The REAC spec provides a high quality and safe, redundant digital audio transfer system that can be easily installed or integrated for any audio snake application. REAC is a “plug and play” system that is easy to configure and requires no complex setup or computer operation. Plug in your mics, plug in the Ethernet cable and you’re ready to go.
Super low latency digital transmission
Degradation of the audio signal is minimal in any digital transfer system. However, musicians, performers or even audiences may suffer from the excessive latency of other digital transfer systems. REAC eliminates these digital audio transmission problems with its super low latency. Even when transmitting 40 channels on-way at 24bit/96kHz/Linear, REAC’s latency is only 0.375ms. This very low latency makes any Roland Digital Snake system perfect for all audio installations, especially in-ear monitoring systems.
Simple and low cost installation with Cat5e cabling
REAC brings another revolution to audio installations by eliminating the need to use thick, heavy and hard to handle analog multi-pair cables by transmitting audio using light, slim and easy to handle Cat5e cable. On one very thin Ethernet cable, REAC can transfer 40x40 channels of high quality 24bit/96kHz audio signal plus MIDI and remote control signals. Since the cable used for REAC transfer is ordinary Ethernet cable, the low cost and easy availability of the cable is a big advantage compared with using analog cable. From temporary installations in outdoor concerts to permanent installations in arenas or halls, REAC provides the benefit of light weight, inexpensive and easy to install cable.
Limitless splitting of all input sources
The Roland Digital Snake systems are designed to provide splits of source audio using standard Ethernet hardware. Using a standard switching hub, you can send source audio to multiple recording consoles, a monitor position, broadcast location and more. No signal degradation will occur from the source’s master output to the recording or any other split output.
Very long distance snake systems can be designed using an S-OPT REAC Optical converter
The S-OPT is a REAC optical converter that converts Roland Digital Snake System REAC signals to and from optical signals for long distance digital audio transmission. By using the REAC optical converter and optical cables, the REAC transmission distance can be extended up to 2 kilometers (~1.24 miles).
Remote Control by computer
A computer can be connected to the REMOTE terminals (RS-232C) of any digital snake end. Once the S-4000RCS software is installed, up to 160 channels of a snake system can be remotely controlled from your computer using up to 4 RS-232c ports.
40 Channels of Digital Recording
Cakewalk's SONAR System, when used in conjunction with REAC, provides the most comprehensive live recording, mixing, mastering and delivery product available. Capture up to 40 channels of audio from your Digital Snake or V-Mixing System directly into SONAR all via a simple Cat5e connected to the network port on your PC.
S-4000D - The REAC Splitter Equipped with Embedded Power
REAC Embedded Power is unique Roland technology that enables the transfer of the digital audio signals as well as the power required by the connected device - all via one CAT5e cable. The S-4000D Splitter and Power Distributor is equipped with 10 REAC ports including 8 ports of REAC Embedded Power. The S-4000D can automatically detect and distinguish a product not supporting REAC Embedded Power. In this case, power is not provided allowing the S-4000D to function as a standard splitter when required.