Short answer: the RME Fireface UFX III, if you are buying new. The MOTU 624 measures as well as it (#8 vs #9 of 17 audio interfaces, 3.7/5 vs 3.7/5) but is discontinued, so only consider it used; the RME Fireface UFX III is still sold new at $3,199.
Why pick the MOTU 624: Audio Science Review measured 112 dB SINAD from its outputs, clean enough for nearly all listening. The tradeoff: It is discontinued and no longer sold new.
What the RME Fireface UFX III does well: Audio Science Review measured 110 dB SINAD, clean for nearly all listening. Watch for: RME doesn’t publish a 32 ohm headphone power figure, so its ability to drive demanding headphones is unknown.
Buy the RME Fireface UFX III if you want one new; the MOTU 624 is discontinued, so only look for it used.
Looking for alternatives? See the complete Headphone Amps and DACs rankings.
Specifications Side By Side
| MOTU 624 | RME Fireface UFX III | |
|---|---|---|
| Price | $795 Discontinued | $3,199.00 |
| Ranked | #8 of 17 in Audio Interfaces | #9 of 17 in Audio Interfaces |
| Device Type | Audio interface | Audio interface |
| SINAD | 112 dB (measured by Audio Science Review) | 110 dB (measured by Audio Science Review) |
| DAC Chip | ESS Sabre32 | - |
| Headphone Outputs | 1 x 6.35 mm | 2 x 6.35 mm |
| Inputs | 2 XLR mic, 2 front-panel Hi-Z guitar, 8 ADAT optical | - |
| Outputs | dedicated main outs, 8 ADAT optical | - |
| Dimensions | 8.6” x 1.7” x 7” (218 x 44 x 178 mm) | 17.3” x 1.7” x 8.3” (440 x 44 x 210 mm) (without rack ears) |
| Weight | 2.2 lbs (1.0 kg) | 6.2 lbs (2.8 kg) |
| Equalizer | - | Yes (TotalMix FX DSP) |
Related Amp and DAC Comparisons
How MOTU 624 compares with other leading options:
- Lynx Hilo 2 USB vs MOTU 624
- MOTU UltraLite-mk5 vs MOTU 624
- MOTU M6 vs MOTU 624
- MOTU M2 vs MOTU 624
- MOTU M4 vs MOTU 624
Prices on this page were last checked October 13, 2026 at 3:17 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Amps and DACs In Full
MOTU 624: $795 Discontinued eBay
Pros: Audio Science Review measured 112 dB SINAD from its outputs, clean enough for nearly all listening. Alongside two XLR mic inputs and two front panel guitar inputs it has eight channels of ADAT optical in and out for expanding the setup, and the reviewer found its browser based control software rich and flexible.
Cons: It is discontinued and no longer sold new. Audio Science Review found its ADC a weak link next to other interfaces it had tested and its DAC short of the best consumer DACs, and MOTU doesn’t publish a 32 ohm headphone power figure. The MOTU UltraLite-mk5 measures similarly and is still sold.
Full MOTU 624 review and specifications →
| DAC Chip | ESS Sabre32 |
|---|---|
| Device Type | Audio interface |
| Dimensions | 8.6” x 1.7” x 7” (218 x 44 x 178 mm) |
| Headphone Outputs | 1 x 6.35 mm |
| Inputs | 2 XLR mic, 2 front-panel Hi-Z guitar, 8 ADAT optical |
| Outputs | dedicated main outs, 8 ADAT optical |
| SINAD | 112 dB (measured by Audio Science Review) |
| Weight | 2.2 lbs (1.0 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
RME Fireface UFX III: $3,199.00 Amazon $3,199.00 eBay
Pros: Audio Science Review measured 110 dB SINAD, clean for nearly all listening. It has two 6.35 mm headphone outputs and TotalMix FX DSP with built in EQ, in a full rack width chassis.
Cons: RME doesn’t publish a 32 ohm headphone power figure, so its ability to drive demanding headphones is unknown. It is large and heavy at 2.8 kg, and for playback it rates below the MOTU M6, which measures slightly cleaner for a small fraction of the cost.
Full RME Fireface UFX III review and specifications →
| Device Type | Audio interface |
|---|---|
| Dimensions | 17.3” x 1.7” x 8.3” (440 x 44 x 210 mm) (without rack ears) |
| Equalizer | Yes (TotalMix FX DSP) |
| Headphone Outputs | 2 x 6.35 mm |
| SINAD | 110 dB (measured by Audio Science Review) |
| Weight | 6.2 lbs (2.8 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons