# What are the 4-channel audio interfaces with the best I/O options? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the 4-channel audio interfaces with the best I/O options?

## Products

### PreSonus Quantum HD 2 USB-C Audio Interface
```yaml
product: presonus-quantum-hd-2-usb-c-audio-interface
brand: PreSonus
price_gbp: 258.31
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
bit_depth: 32
sample_rate: 44.1, 48, 88.2, 96, 176.4, 192
phantom_power: +48 VDC
input_connections: 2 combo XLR-1/4 in mic/line/instrument, ADAT optical, stereo S/PDIF, MIDI
midi_compatibility: 5-pin female DIN MIDI I/O
number_of_channels: 20 input / 24 output
output_connections: 2 main 1/4 in TRS, 2 line 1/4 in TRS, 2 reamp, 1 headphone, ADAT optical, stereo S/PDIF, MIDI
```

- **Price:** £258.31 [^1]
- **Summary:** The PreSonus Quantum HD 2 is a 20-in/24-out USB-C interface with 32-bit resolution, sample rates up to 192 kHz, two MAX-HD preamps, ADAT and S/PDIF expansion, reamp outputs, and loopback audio. It suits producers, musicians, and project studios needing low-latency recording with flexible analog and digital connectivity.
- **Ideal For:** It suits users seeking a 4-channel audio interface with strong I/O options because it combines two combo mic/line/Hi-Z inputs with four line outputs, two reamp outputs, headphone output, ADAT, S/PDIF, MIDI, and 20-in/24-out operation.
- **Additional Sources:** [^2], [^3]

---
## References & Sources
[^1]: B&H Photo Video, accessed 2026-09-13. https://www.bhphotovideo.com/c/product/1811738-REG/presonus_quantum_hd2_usb_c_audio.html
[^2]: Sweetwater, accessed 2026-09-13. https://www.sweetwater.com/store/detail/QuantumHD2--presonus-quantum-hd-2-usb-c-audio-interface
[^3]: Guitar Center, accessed 2026-09-13. https://www.guitarcenter.com/PreSonus/Quantum-HD-2-USB-C-Audio-Interface.gc