Sonifex CM-ULR1 Unbalanced to Balanced Audio Converter
StudioHub+™ is a registered trademark of Radio Systems Inc.
This product allows the connection of a stereo unbalanced line input on phono connectors to a balanced line output via a RJ45 with StudioHub+™ pinout.
It istransformer balanced, with a 1:2 ratio, so 6dB of gain is added to the input to help interface with the higher signal levels associated with professional outputs.
This unit is a passive version of the RB-UL1, and provides you with an alternative to wiring an unbalanced output directly into a balanced input.
By placing this box close to the unbalanced output (before the cable run to the balanced input), the connection will benefit from the input device’s common mode rejection capabilities, reducing noise and interference.
Block Diagram
Connectors & Controls
RCA Phono Inputs
This unit uses a stereo unbalanced line phono connector with the following connections:
| Pin Type | Connection |
| White Tip: | Left |
| White Screen: | Ground |
| Red Tip: | Right |
| Red Screen: | Ground |
Analogue Outputs CM-ULR1
The stereo balanced line output is on a female RJ45 connector with the following standard StudioHub+™ pin assignments:
| Pin No | Connection |
| 1 | Left Phase |
| 2 | Left Non-Phase |
| 3 | Right Phase |
| 4 | Ground |
| 5 | N/C |
| 6 | Right Non-Phase |
| 7 | N/C |
| 8 | N/C |
CM-ULR1 Technical Specification |
|
Audio Specification |
|
| Input/Output Level Ratio: | 1:2 |
| Input/Output Impedance Ratio: | 1:4 |
| Max Input Level: | +22dBu |
| Max Output Level: | +28dBu |
| Frequency Response: | 20Hz to 20kHz, +0/-0.5dB |
| Noise: | <-100dBu A-wgtd |
| Distortion Ref +8dBu (Output): | <0.02% |
Connections |
|
| Stereo Unbalanced Line Input (CM-ULR1 & CM-ULX1): | 2 x RCA phono connectors |
| Balanced Line Output (CM-ULR1): | 1 x RJ45 female StudioHub+™ pinout |
Equipment Type |
|
| CM-ULR1: | Unbalanced to balanced audio converter, RJ45 output |
Physical Specification |
|
| Dimensions (Raw): | 7.7cm (W) x 8.3cm (D) x 4.2cm (H) 3.0” (W) x 3.3” (D) x 1.7” (H) |
| Dimensions (Boxed): | 12.7cm (W) x 22.9cm (D) x 7.6cm (H) 5” (W) x 9” (D) x 3” (H) |
| Weight: | Nett: 0.22kg Gross: 0.33kg Nett: 0.49lbs Gross: 0.73lbs |