Overview
The RB-MS4X3 is a versatile device that offers three different methods for providing phantom power to a connected microphone. This can be done through an external power connector, a direct connection to output 1, or through a phantom loopback from output 2. The front panel of the device allows for easy control and monitoring of the power supply method, and it is even possible to use two methods simultaneously without affecting audio quality.
Additionally, the RB-MS4X3 features ground loop hum elimination capabilities through toggle switches that lift pin 1 of the output connectors. This passive, quad splitter is designed for use in a 19″ rack and can split a single microphone or line source to up to three destinations using Neutrik XLR connectors. With high quality audio transformers and a wide signal range capability of up to +18dBu, the RB-MS4X3 is suitable for both microphone and line level splitting applications. A 30dB pad can also be applied for proper signal termination.
About the Sonifex RB-MS4X3
The RB-MS4X3 is a passive, quad, “one-to-three” splitter housed in a 19” rack. Each bank is designed to split a single microphone or line source to up to three destinations, using Neutrik XLR connectors. Cable connections are located on the rear panel, with recessed controls and indicators available to the user on the front panel, allowing quick and easy access to setup parameters.
Wide Signal Range Capability
The RB-MS4X3 uses high quality audio transformers that are capable of accepting input levels of up to +18dBu, making the splitter useful in both microphone and line level splitting applications. A 30dB pad can be applied to the input, allowing a line level signal to be interfaced into a microphone input with suitable levels and the correct termination.
Test, Conditions, Results
Frequency Response • Ref. -6dBu, 1kHz ±0.5dB
• Source impedance = 150Ω
• Load impedance = 10kΩ 10Hz – 30kHz ±0.5dB
Total Harmonic Distortion • Ref. +3dBu, 50Hz
• Source impedance = 150Ω
• Load impedance = 10kΩ 0.02%
Total Harmonic Distortion 0.1% • Ref. 0.1%THD+N, 50Hz
• Source impedance = 150Ω
• Load impedance = 10kΩ +13dBu
Total Harmonic Distortion 1% • Ref. 1%THD+N, 50Hz
• Source impedance = 150Ω
• Load impedance = 10kΩ +18dBu
Common Mode Rejection Ratio • Ref. 20kHz
• Source impedance = 600Ω
• Load impedance = 10kΩ +60dB
Equipment Type
RB-MS4X3 Quad 3 way microphone splitter.
Physical Specification
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H)(1U)
19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions (Boxed): 58.5cm (W) x 22.5cm (D) x 7cm (H)
23” (W) x 8.9” (D) x 2.8” (H)
Weight: Nett: 1.5kg Gross: 1.9kg
Nett: 3.3lbs Gross: 4.2lbs
Versatile Phantom Powering Options
The RB-MS4X3 offers three methods of providing phantom power to a microphone connected to its input:
From the external +48VDC power connector.
From a microphone amplifier connected to output 1 (direct).
From a microphone amplifier connected to output 2 (phantom loopback).
Controlling which method is used to provide phantom power is easy with front panel switches and indicators. It is possible to concurrently power a microphone using any two of the above methods without degrading audio performance, thus providing power supply redundancy.
Ground Loop Hum Elimination
Ground loop hum problems can be quickly eliminated using the front panel toggle switches to lift pin 1 of the output connectors (output 2 and 3 only).
