Used in a studio only. Imperfect working order brand new power supply as the old power supply got damaged in a move.

Here are the specifications for the Roland Rubix44 (4-in / 4-out USB Audio Interface):

Audio System & Audio Quality

• Channels: 4 Simultaneous Inputs / 4 Output Channels
• Signal Processing / Bit Depth: 24-bit
• Sampling Frequencies: 44.1 kHz, 48 kHz, 96 kHz, 192 kHz
• Dynamic Range:
• • AD block (Input): 104 dB typ.
  • DA block (Output): 109 dB typ.
• Headroom: 14 dB

Inputs & Mic Preamps

• Inputs:
• • 4 x XLR/TRS Combo jacks (Mic/Line)
  • 2 x Hi-Z (High Impedance) inputs for electric guitar/bass (on Inputs 1L and 3L)
• Phantom Power: +48V (switchable on Channels 1/2 and 3/4)
• Preamp Quality: Low-noise, high-definition mic preamps
• Input Impedance:
• • XLR: \ge 4 k$\Omega$ balanced
  • TRS: \ge 15 k$\Omega$ balanced
  • Hi-Z (1/4"): \ge 500 k$\Omega$

Outputs & Monitoring

• Outputs: 4 x 1/4-inch TRS phone jacks (impedance balanced)
• Headphones Output: 1 x 1/4-inch stereo phone jack (20\text{ mW} + 20\text{ mW} into 47\,\Omega load)
• Direct Monitoring: Dedicated front-panel latency-free direct monitor knobs (1/2 and 3/4) with Mono sum switches

Onboard Hardware Features

• Analog Dynamics Processing: Built-in hardware analog Compressor/Limiter on Inputs 1/2 and 3/4 (selectable modes with threshold control)
• Level Indicators: Top- and front-viewable LED signal/clip indicators
• Ground Lift Switch: Rear-panel ground lift switch for noise mitigation
• Loopback Support: Hardware Loopback switch for streaming/podcasting

Connectivity & Power

• USB Interface: Hi-Speed USB (Type-B)
• MIDI I/O: 5-pin MIDI IN and OUT ports
• Power Supply: Included AC Adaptor (DC IN)

Dimensions & Build

• Chassis: Heavy-duty, extensively shielded metal construction
• Dimensions (W x D x H): 310 mm × 165 mm × 46 mm (12.25" \times 6.5" \times 1.81")
• Weight: 1.8 kg (4 lbs)

System Compatibility

• Operating Systems: Windows (7, 8, 8.1, 10), macOS (10.10+), and Apple iOS (iPad class-compliant)