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Monitr is a comprehensive audio output monitoring utility for eurorack systems. The module is equipped with a stereo VCA-controlled input mixer with master volume control and VU meters, plus a powerful headphone section for both live performance and detailed monitoring.
- 2-channel stereo VCA mixer with CV per channel
- Master volume control and dual 5-segment VU meter
- Headphone amp with level and 3-way selectable cue source
- System mute switch for convenient output silencing
- Low-noise balanced pro line-level outputs at +4 dBu
Stereo VCA Mixer
Monitr’s two stereo inputs, IN 1 and IN 2, are AC-coupled specifically for audio signals, with the R inputs normalled to the L inputs. These input signals are amplified and mixed via stereo VCA circuits to reduce noise and allow for external voltage control. The CHAN 1 and CHAN 2 parameters are for manual adjustments of audio levels, while the VCA1 and VCA2 jacks accept control voltages. The full range of each stereo VCA is 10 Vpp. The mixed stereo signal is buffered and passed on to the master volume circuit.
The VOLUME parameter is a variable attenuator which controls the master stereo output level. It can also amplify the signal up to +6dB above unity gain.
The output volume is visually indicated by two 5-segment VU METERS, scaled appropriately for +4 dBu professional line-level output. Best practice is to keep the master signal volumes at or below +3 dBu (GREEN, YELLOW), with transient peaks occasionally reaching +6 dBu (RED). This will optimize the signal’s dynamic range when feeding into audio interfaces or amplifiers.
Monitr also features a MUTE OUTPUT switch that completely silences the main outputs. This is convenient once sound check levels are adjusted before a live performance begins, as the mute switch does not affect the VU meters or headphone cueing section.
The module’s headphone circuit is designed to drive a wide-range of headphones with enough detail and power for both studio monitoring and live performance. The LEVEL parameter adjusts the volume of stereo headphone plugged into the PHONES jack. Acceptable headphone impedance ranges from 32 Ω up to 600 Ω.
The headphone source is selected with a 3-way switch, which is useful for cueing during a live performance. The center position, MSTR (Master), monitors the primary master output signal post Volume, so the master VOLUME also affects the headphone volume. The other two positions, CH1 and CH2, exclusively monitor the two input signals respectively, and are not affected by their VCA levels (CHAN 1, CHAN 2, VCA1, or VCA2).
OUT L and OUT R provide balanced line-level stereo output of the master audio signal via 1/4-inch TRS jacks, typically to an audio interface, mixer or amplifier. These balanced connections allow for low-noise signal transmission over longer cable runs, provided the destination input is also balanced. However, unbalanced TS cables can also be used and will simply carry the signal unbalanced.