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CM-HPR1 Headphone Amplifiers

CM-HPX1 Headphone Amplifiers

Quick Overview

Headphone Volume Control, Passive, XLR Input - Jack Output
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This product allows the connection of a stereo balanced line input via 2 x female XLRs and creates a headphone output, with level control.

It is transformer balanced, and can be used with any headphones above 150Ω 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 150Ω set of headphones looks like 600Ω at the input, a suitable load for most good quality line output stages).

Block Diagram

cm-hpx1 Diagram

Connectors & Controls

Headphone Output

The stereo headphone output uses a stereo 6.35mm 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-HPX1

The stereo analogue input is on two female 3 pin 
XLR connectors with the following pin assignments:
Pin 1: 0V Common
Pin 2: Phase
Pin 3: Non Phase


CM-HPX1 Technical Specification

Audio Specification


Input/Output Level Ratio: 2:1
Input/Output Impedance Ratio: 4:1
Minimum Headphone Impedance: 150Ω
Max Input Level: +28dBu
Max Output Level: +22dBu
Frequency Response: 20Hz to 20kHz, +0/-0.5dB
Noise: <-115dBu A-wgtd
Distortion Ref +8dBu (Output): <0.01%
Common Mode Rejection: >80dB


Main Stereo Input (CM-HPX1): 2 x XLR 3 pin, female
Output: ¼” (6.35mm) A/B gauge 3-pole stereo jack sockets

Equipment Type

CM-HPX1: Headphone volume control, XLR input

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)
Weight: Nett: 0.22kg Gross: 0.33kg
Nett: 0.49lbs Gross: 0.73lbs