Sonifex CM-HPR1
TheSonifex CM-HPR1 allows the connection of a stereo balanced line input via a RJ45 with StudioHub+™ pinout and creates a headphone output, with level control. It is transformer balanced, and can be used with any headphones above 150 Ω impedance.
The transformer ratio of 2:1 ensures that any headphone load presented at the output is reflected through to the input at a 1:4 ratio (hence a 150 Ω set of headphones looks like 600 Ω at the input, a suitable load for most good quality line output stages).
Block Diagram
Connectors & Controls
Headphone Output
The stereo headphone output uses a stereo 6.35 mm jack socket with the following connections:
| Pin Type | Connection |
| Tip: | Left |
| Ring: | Right |
| Screen: | Ground |
The headphone level will be at half the level of the incoming signal with the volume control at 100%.
Volume Level Control
The volume level control sets the output level of the stereo headphone socket and runs logarithmically from zero to the maximum output level.
Analogue Inputs CM-HPR1
The stereo analogue input 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 |
