Q-SYS QIO-ML4I Daisy-Chainable Peripheral with 4 Mic/Line Inputs

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Q-SYS QIO-ML4I Daisy-Chainable Peripheral with 4 Mic/Line Inputs

The Q-SYS QIO Series network audio I/O expanders extend your Q-SYS system’s capabilities and enable streamlined interoperability with non-networked audio devices. By separating local I/O from processing hardware, the QIO Series offer modular and easily scalable network I/O to support your desired topology. There are three models that offer mic/line connectivity to integrate consumer or professional audio devices into your Q-SYS system.​​​​

Features & Benefits

  • Native network audio I/O solution for Q-SYS
  • QIO-ML4i: Four (4) mic/line inputs
  • QIO-L4o: Four (4) line outputs
  • QIO-ML2x2: Two (2) mic/line inputs and two (2) line outputs
  • Professional, high performance mic/line level inputs (with +48 VDC phantom power) and/or line outputs
  • Microphone detection on inputs to enable monitoring, usage statistics and failure notifications
  • Power over Ethernet (PoE) capable or daisy-chain up to four QIO expanders on a single network run (with local daisy-chained DC power
  • Simple drag-and-drop integration and comprehensive management via Q-SYS Designer Software and Q-SYS Reflect Enterprise Manager
  • Surface- or rack-mountable (1RU, quarter width)
  • Includes surface mounting hardware

Professional mic/line connectivity where you need it: QIO Series network audio I/O expanders allows you to provide your Q-SYS system with greater flexibility to deploy mic/line audio connectivity where it’s most convenient. The network audio I/O expanders feature professional mic/line level inputs with +48 VDC phantom power and/ or line outputs to ensure high-performance and compatibility, along with microphone detection on inputs to enable monitoring, usage statistics and failure notifications. Additionally, each of the three models features a compact form factor that can be rack- or surface-mounted.

Expanded I/O customization: QIO Series is intended to present a simpler way to add network I/O connectivity to Q-SYS systems, decoupling the physical location of the I/O from processing hardware to support distributed or centralized processing architectures. Additionally, QIO Series lets you customize your I/O configuration, and compliments the strengths of newer Q-SYS Core models that were designed with fewer onboard I/O options (Core Nano, Core 8 Flex, or NV-32-H (Core Capable)).

Simplicity & scalability: Daisy-chain up to four of the QIO Series devices on a single network run (with local daisy-chained DC power) to consume fewer network ports, avoid rack clutter, and allow for quicker future expansion without pulling additional network cables. Alternatively, QIO Series are also PoE-capable, providing simple single cable connectivity (when devices aren’t daisy-chained).

Designed for Q-SYS: The QIO Series deliver native network I/O customization to Q-SYS, a cloud-manageable audio, video and control platform, built to deliver scalable, flexible AV solutions into the future. Learn more about Q-SYS.


  • Connectivity: Four (4) mic/line inputs
  • Mic/Line Inputs
    • Maximum input level: +24 dBu
    • Preamplifier gain range: 0 dB to 60 dB
    • Phantom power: +48 VDC
    • Equivalent Input Noise: < -120 dBu, no weighting @ 20 Hz to 20 kHz
    • Input to input crosstalk @ 1 kHz: > 85 dB
  • Input Dynamic Range
    • @ +24 dBu sensitivity: > 105 dB
    • @ +10 dBu sensitivity: > 100 dB
    • @ -10 dBu sensitivity: > 95 dB
    • @ -36 dBu sensitivity: > 80 dB
    • Input impedance: 5 kΩ single-ended, 10 kΩ balanced
  • Line Outputs
    • Sample rate: 48 kHz
    • Bit Depth: 24 bit
  • Other Connectors
    • External power supply: 24 VDC nominal, 2.5 A on Euro connector with second connector for daisy-chaining (QIO-PSU power supply sold separately)
    • LAN (PoE): Gigabit LAN connection for Q-LAN, PoE
    • PoE specification: Conforms to IEEE 802.3af Type 1
    • LAN (Thru): Ethernet daisy-chaining
  • General
    • Dimensions: 8.5 x 4.25 x 1.59 in (215.9 x 108 x 40.4 mm)
    • Weight: 1.72 lb (0.78 kg
    • Mounting options: Surface- and wall-mountable (hardware included) / Rack-mountable; 1RU, quarter-rack width (QIO-RMK rack kit sold separately)
  • Environmental
    • Ambient operating temperature range: 0°C to +50°C
    • Humidity: 0% - 85% through 30°C, non-condensing
    • Storage temperature: -20° to 70°C
    • Compliance: FCC 47 CFR Part 15, IC ICES-003, CE (EN55032, EN55035), EU RoHS directive 2011/65/EU, WEEE directive 2012/19/EU, China RoHS directive GB/T26572, EAC, UL, C-UL, NOM-019

*All specifications are subject to change without notice.


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