QSC Q-SYS I/O-8 Flex Channel Expander — Used, Fully Functional

Up for sale is a used QSC Q-SYS I/O-8 Flex Channel Expander in fully working condition. Unit powers on normally — the front OLED display shows Device Name and Design Status as expected (see photos). All buttons, ports, and indicators function correctly. This is a professional networked audio I/O peripheral built for Q-SYS DSP systems, widely used in corporate conference rooms, houses of worship, higher education, and installed AV environments.

No external power supply or PoE+ injector included. This unit powers over PoE+ (IEEE 802.3at) through the LAN A port — a single CAT cable from any PoE+ switch provides both network and power. A 24VDC external supply can also be used for redundancy.

Unit shows normal signs of rack/install use. Some light scuffing on front panel corners. Velcro on the underside from a previous table or wall mount. All connectors are intact and undamaged. All photos are of the actual item.

What’s Included:

✅ QSC I/O-8 Flex unit — fully working

✅ Blue Euro-block flex channel connectors (installed)

✅ Green Euro-block GPIO and power connectors (installed)

❌ No PoE+ injector or external 24VDC PSU

❌ No rack ears

❌ No original box or manual

Key Features:

∙ 8 software-definable Flex Channels — configure each as mic/line input (with phantom power) or line output via Q-SYS Designer Software

∙ Any mix of inputs and outputs, 8×0 through 0×8

∙ PoE+ powered — single CAT cable carries network + power (IEEE 802.3at)

∙ Optional 24VDC external power input for redundancy

∙ Audio-to-USB Bridging — works with Zoom, Teams, Skype via driverless USB to host PC

∙ 2× USB-A host ports, 1× USB-B device port

∙ Dual Gigabit RJ45 network ports (LAN A/PoE+, LAN B)

∙ RS-232 serial control via 3-pin Euro block

∙ GPIO: 8 inputs (0–24VDC analog or contact closure) + 8 outputs (open collector, 24VDC at 200mA max)

∙ 12VDC GPIO power pins (100mA max)

∙ Front OLED display shows device name, design name, and status

∙ NEXT and ID buttons for navigation and network identification

∙ Compact half-rack chassis — mounts under table, on wall, or in equipment rack

∙ Compatible with all Q-SYS Core processors

Condition Notes:

Fully functional — tested and working before listing. Normal cosmetic wear from professional installation use. Light scuffing on front corners. Velcro residue on the bottom. No cracks, no bent pins, no damaged ports. OLED screen, power LED, and all controls are in good working order.

⚠ Note: This is a discontinued product — no longer manufactured by QSC. Used units are the only option for integrators looking to expand existing Q-SYS systems.

Ships within 2 business days, carefully packed with bubble wrap and foam. $19.99 flat rate shipping via UPS or FedEx. Insured. Please message with any questions before buying.