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QSC Q-SYS QIO-ML4i: 4-Channel Mic/Line Input Audio Expander

Model QIO-ML4i

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  • Authorized QSC Reseller
  • Manufacturer Warranty
  • Pan-India Delivery
  • Expert Project Support
  • Four mic/line inputs, preamp 0 to 60 dB
  • +48 V phantom power and microphone detection
  • PoE powered, or 24 V DC with a daisy-chain connector
  • Daisy-chain up to four QIO units on one network run
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Product Overview

Overview

The Q-SYS QIO-ML4i is a compact network audio expander with four mic/line inputs and no outputs. A quarter-rack case, PoE power and a daisy-chain network port make it the easy way to put a few microphones at a lectern, a wall or a table far from the core. It is the input-only member of the compact trio, with the QIO-L4o taking outputs and the QIO-ML2x2 splitting two and two.

Corporate AV supplies, installs and supports Q-SYS systems from QSC across India. Request a quote for the QIO-ML4i with supply, installation and commissioning.

Key features

  • Four mic/line inputs, preamp 0 to 60 dB
  • +48 V phantom power and microphone detection
  • PoE powered, or 24 V DC with a daisy-chain connector
  • Daisy-chain up to four QIO units on one network run
  • Quarter-rack width, surface-mount hardware included

Typical applications

  • Lecterns and tables needing a few microphones
  • Classrooms where the core sits in a back room
  • Retrofit installs adding inputs without pulling more cable
Why choose the QIO-ML4i
it is a 4-channel mic/line input network audio expander from QSC, it puts four phantom-powered inputs wherever the microphones are, on a single PoE cable.
Product Highlights

Key Benefits

Four mic/line inputs, preamp 0 to 60 dB

+48 V phantom power and microphone detection

PoE powered, or 24 V DC with a daisy-chain connector

Daisy-chain up to four QIO units on one network run

Quarter-rack width, surface-mount hardware included

Use Cases

Ideal Applications

Lecterns and tables needing a few microphones

Classrooms where the core sits in a back room

Retrofit installs adding inputs without pulling more cable

Technical Details

Technical Specifications

Connectivity
Inputs 4 mic/line
LAN (PoE) Gigabit, Q-LAN; PoE IEEE 802.3af Type 1
LAN (Thru) Ethernet daisy-chaining, up to four QIO units per network run
External power 24 V DC nominal, 2.5 A on Euro connector (QIO-PSU, sold separately)
Input performance
Preamp gain range 0 to 60 dB
Maximum input level +24 dBu
Phantom power +48 V DC
Input impedance 10 kOhm balanced, 5 kOhm single-ended
Equivalent input noise Below -120 dBu, unweighted
Input-to-input crosstalk at 1 kHz Above 85 dB
Dynamic range Above 105 dB at +24 dBu; above 80 dB at -36 dBu
Sample rate 48 kHz, 24-bit
Physical
Dimensions (L x W x H) 215.9 x 108 x 40.4 mm
Weight 0.78 kg
Mounting Surface or wall (hardware included); rack with QIO-RMK kit, sold separately
Operating temperature 0 to 50 C

Documents & Downloads

Datasheet Q-SYS QIO-ML4i Data SheetOfficial Biamp data sheet for the QIO-ML4i. The PDF may also cover other models in the same range. User Manual Q-SYS QIO-ML4i ManualOfficial Biamp manual for the QIO-ML4i. The PDF may also cover other models in the same range.

Related Solutions

Why CorporateAV?

Sourced right. Installed right.

Genuine Manufacturer Stock
Every unit sourced through authorized distribution, backed by manufacturer warranty.
Expert AV Integration
Paired correctly with compatible systems and your room's existing AV infrastructure.
Pan-India Delivery & Support
On-site installation and ongoing technical support wherever your project is based.
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Additional Information

Why Buy The QIO-ML4i From Corporate AV?
  • Genuine QSC stock with manufacturer warranty support
  • Custom pricing for bulk and multi-room / multi-site rollouts
  • Local after-sales support — a real team you can call or WhatsApp, not a call centre
  • Expert guidance on product selection and deployment planning
  • Professional installation across Bangalore, Hyderabad, Mumbai, Delhi NCR, and the wider India region
Contact us: +91 99452 30186, WhatsApp us or email avsupport@corporateav.in.
Distribution

Corporate AV supplies and installs QSC products across Bangalore, Hyderabad, Mumbai, Delhi NCR, Chennai, Pune, Kolkata, Ahmedabad, and the wider India region.

Frequently Asked Questions

What is the Q-SYS QIO-ML4i?
The Q-SYS QIO-ML4i is a compact network audio expander with four mic/line inputs and no outputs. A quarter-rack case, PoE power and a daisy-chain network port make it the easy way to put a few microphones at a lectern, a wall or a table far from the core. It is the input-only member of the compact trio, with the QIO-L4o taking outputs and the QIO-ML2x2 splitting two and two.
Does the QIO-ML4i have outputs?
No, only four inputs. The QIO-L4o has four outputs, and the QIO-ML2x2 has two inputs and two outputs.
How is it powered?
Over Ethernet (IEEE 802.3af Type 1) or from a 24 V DC supply on a Euro connector, with a second connector to pass power to the next unit when daisy-chaining. The QIO-PSU supply is sold separately.
How many can share a network run?
Up to four QIO Series devices daisy-chain on one network run using local daisy-chained DC power, which saves switch ports.
How good is the input noise performance?
Equivalent input noise is below -120 dBu unweighted, input dynamic range exceeds 105 dB at +24 dBu sensitivity and crosstalk is above 85 dB.
How big is it?
About 215.9 x 108 x 40.4 mm and 0.78 kg, so it fits behind a lectern or in a quarter-rack tray.
Can Corporate AV supply and install the Q-SYS QIO-ML4i in India, and how do I get a quote?
Yes. Corporate AV supplies, installs and supports Q-SYS and QSC systems across India, with a site survey, commissioning and after-sales support. Use the Request a Quote button on this page or message us on WhatsApp.