# What are the most compact and portable Firewire audio interfaces? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the most compact and portable Firewire audio interfaces?

## Products

### Apogee Ensemble (FireWire models)
```yaml
product: apogee-ensemble-firewire-models
brand: Apogee
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
bit_depth: 24
i_o_count: 36 channels simultaneous (8 analog I/O + ADAT + SPDIF)
sample_rate: 192000
phantom_power: 48V on mic inputs
number_of_preamps: 4
```

- **Price:** £None [^1]
- **Summary:** The Apogee Ensemble (FireWire) is a 1U rack multichannel FireWire audio interface featuring Apogee converters, four digitally controlled mic preamps, eight analog inputs, ADAT and S/PDIF I/O, and support up to 192 kHz/24-bit. It includes Maestro routing/control and can operate in stand-alone converter mode, suited for Mac-based studios needing high-quality multichannel conversion.
- **Ideal For:** Suited for compact portable FireWire setups because it provides eight analog channels, four onboard mic preamps, and 192 kHz/24-bit conversion in a single 1U rack unit.

### RME Fireface UCX
```yaml
product: rme-fireface-ucx
brand: RME
price_gbp: 1269.31
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
latency: 0.4 ms ADC / 0.15 ms DAC (converter latency); TotalMix direct monitoring down to 0.79 ms measured roundtrip at 44.1 kHz
bit_depth: 24 bit
i_o_count: 18 in / 18 out
sample_rate: 192 kHz
phantom_power: +48 V on mic inputs
number_of_preamps: 2
```

- **Price:** £1269.31 [^2]
- **Summary:** Compact half-rack USB/FireWire interface with two digitally controlled mic preamps, four front instrument/line inputs and ADAT/SPDIF/AES digital I/O; supports up to 18×18 channels (44.1/48 kHz) and 24-bit/192 kHz conversion with RME's TotalMix FX and very low converter latency. Suited to mobile and project-studio users who need high-quality conversion, extensive routing and ultra-low latency monitoring in a small footprint.
- **Ideal For:** Because it is a half-rack, bus-powered-capable (with external PSU) unit offering 8 analog I/O, 2 mic preamps, and full 24-bit/192 kHz support with very low converter latency, the UCX is one of the most compact and portable Firewire-compatible Fireface interfaces.

### RME Fireface UFX
```yaml
product: rme-fireface-ufx
brand: RME
price_gbp: 2389.94
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
bit_depth: 24
i_o_count: 188
sample_rate: 192000
phantom_power: 48V
number_of_preamps: 4
```

- **Price:** £2389.94 [^3]
- **Summary:** The RME Fireface UFX is a high-end multichannel USB audio interface offering up to 188 simultaneous I/O channels, 24-bit/192 kHz conversion, TotalMix FX routing/DSP and direct USB recording. It features multiple digital formats (MADI, ADAT, AES) alongside analog I/O and is built for professional studios and live facilities requiring large channel counts and reliable clocking.
- **Ideal For:** Not ideal - its large 188-channel I/O and rackmount size make it unsuitable for the most compact portable Firewire interfaces; it suits users needing a high channel-count stationary studio interface with USB 3/MADI connectivity.

---
## References & Sources
[^1]: Apogee Knowledge Base (legacy product pages), accessed 2026-06-13. https://knowledge.apogeedigital.com/ensemble-firewire-impedance-specs-1
[^2]: B&H Photo Video (UCX II listing), accessed 2026-06-13. https://www.bhphotovideo.com/c/product/1645241-REG/rme_ff_ucx_ii_fireface_ucx_ii_usb.html
[^3]: Sound On Sound (affiliate listing), accessed 2026-06-13. https://www.soundonsound.com/reviews/rme-fireface-ufx-iii