Radial PRO MS2 MICROPHONE SPLITTER

Radial ProMS2: a "Pro" series mic splitter designed for stage and studio

The Radial Pro MS2 (often referenced as ProMS2) fits into Radial's "plug-and-play" approach: a simple, passive, and high-performance solution to meet a very common need in live and professional environments. Its role is clear: to split a balanced mic signal to send it to multiple devices simultaneously while preserving signal integrity. This design philosophy makes it a particularly appreciated tool whenever the same source must be shared between multiple audio chains without compromising cleanliness and stability.

For whom and for what uses: FOH, monitors, studio, and broadcasting

On stage, the Pro MS2 quickly becomes indispensable when the same mic needs to feed multiple mixing consoles (for example, a front-of-house console and a monitor console) or when a reliable separation is required between the live control room and a recording system. It is also well suited for setups where a signal must be sent to a broadcast stream (capture, streaming, broadcast) while maintaining a dedicated channel for the main mix.

In the studio, it allows distributing a microphone to multiple preamps to compare preamp tonalities, feed different processing chains, or secure a take by duplicating the signal to multiple destinations. All with a simple philosophy: no power supply to manage, no complex settings, and immediate deployment.

Key design points: isolation, signal purity, and ground issue control

An Eclipse ET-MS10 transformer at the heart of the split

Inside, the ProMS2 relies on an Eclipse ET-MS10 transformer responsible for signal separation. Its nickel laminated core contributes to a wide frequency response and a signal handling described as very stable, with extremely low distortion. The goal is to maintain a faithful signal, free of artifacts or unwanted coloration, even under demanding stage conditions.

Buzz and interference reduction: noise rejection and protections

Live systems often suffer from hard-to-diagnose issues: hum, mains-related buzz, interference, and ground loops. The Pro MS2 focuses on these with a common-mode noise rejection of 115 dB. The transformer is additionally double-shielded against magnetic fields (dedicated shielding and external steel enclosure), with RF filtering and 100% discrete circuitry to preserve signal clarity and reduce disturbances.

Practical controls: pad and ground lift switch

In real use, level differences and wiring constraints arise quickly. The ProMS2 includes a -30 dB pad to handle situations requiring strong attenuation, as well as a ground lift switch to help address hum caused by connections between multiple systems. These simple but crucial features save valuable time during setup and troubleshooting.

Durability and rack integration

As is common with Radial, the build targets heavy use: rugged steel enclosure and connectors designed to withstand repeated handling. Another practical advantage: the format allows mounting up to 8 units in a rack with a Radial J-Rak, facilitating multi-source split systems in touring rigs or fixed installations.

Technical specifications

Frequency response - start	20 Hz	THD	0,001% @1 kHz / +4 dBu
Frequency response - end	20 kHz	Inputs	XLR
Category	Direct box	Analog outputs	2 x XLR
Number of channels	1	Power supply	Passive
Digital conversion	No	Weight	720 g
Max input level (dBu)	26	Dimensions (mm)	84 x 127 x 48
Settings	-30 dB attenuator, ground lift switch

Power	passive	Input impedance	2.5K Ohms unbalanced
Circuit	passive	Output impedance	140K Ohms balanced
Tubes	no	Frequency response	20 Hz - 20 kHz
Built-in preamp	no	Gain	-0.5 dB
Transformer	Eclipse ET-MS10	Dynamic range	>140 dB
Controls	-30 dB attenuator, ground lift switch	Noise level	-140 dB
Pad	-30 dB	Max input	+26 dBu
Outputs	2 x XLR	Phase deviation	1 degree at 20 Hz
Outputs (product description)	1 transformer-isolated output + 2 direct outputs	Common-mode noise rejection	115 dB