Short answer: the RME Babyface Pro FS, if you are buying new. The MOTU 624 ranks higher than it (#8 vs #10 of 17 audio interfaces, 3.7/5 vs 3.6/5) but is discontinued, so only consider it used; the RME Babyface Pro FS is still sold new at $849.
The case for the MOTU 624: Audio Science Review measured 112 dB SINAD from its outputs, clean enough for nearly all listening. The catch: It is discontinued and no longer sold new.
Why pick the RME Babyface Pro FS: Audio Science Review measured 108 dB SINAD from its outputs, clean enough for nearly all listening. The tradeoff: It costs far more than the MOTU M2, which measured a higher SINAD and rates higher.
Buy the RME Babyface Pro FS new; the MOTU 624 is no longer sold new, so it only makes sense as a used find.
Looking for alternatives? See the complete Headphone Amps and DACs rankings.
Specifications Side By Side
| MOTU 624 | RME Babyface Pro FS | |
|---|---|---|
| Price | $795 Discontinued | $849.00 |
| Ranked | #8 of 17 in Audio Interfaces | #10 of 17 in Audio Interfaces |
| Device Type | Audio interface | Audio interface |
| SINAD | 112 dB (measured by Audio Science Review) | 108 dB (measured by Audio Science Review) |
| DAC Chip | ESS Sabre32 | - |
| Headphone Outputs | 1 x 6.35 mm | 2 (6.35 mm and 3.5 mm) |
| Inputs | 2 XLR mic, 2 front-panel Hi-Z guitar, 8 ADAT optical | 2 XLR mic/line, 2 6.35 mm line/instrument, optical ADAT/S/PDIF, USB |
| Outputs | dedicated main outs, 8 ADAT optical | 2 XLR line, 2 headphone |
| Dimensions | 8.6” x 1.7” x 7” (218 x 44 x 178 mm) | 4.3” x 1.4” x 7.1” (108 x 35 x 181 mm) |
| Weight | 2.2 lbs (1.0 kg) | 1.5 lbs (680 g) |
| Balanced Output | - | Yes (XLR outs) |
| Volume Control | - | Hardware knob |
Related Amp and DAC Comparisons
More top alternatives to MOTU 624:
- 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 Babyface Pro FS: $849.00 Amazon $849.00 eBay
Pros: Audio Science Review measured 108 dB SINAD from its outputs, clean enough for nearly all listening. It is well equipped, with two XLR mic inputs, two instrument inputs, optical ADAT or S/PDIF input, balanced XLR monitor outputs and two headphone jacks (6.35 mm and 3.5 mm). Audio Science Review praised its compact hardware and noted it runs without an external power supply.
Cons: It costs far more than the MOTU M2, which measured a higher SINAD and rates higher. RME doesn’t publish a 32 ohm power figure, and Audio Science Review found the headphone output fine for casual monitoring but short on power for difficult or low impedance headphones.
Full RME Babyface Pro FS review and specifications →
| Released | 2019 (7 years ago) |
|---|---|
| Balanced Output | Yes (XLR outs) |
| Device Type | Audio interface |
| Dimensions | 4.3” x 1.4” x 7.1” (108 x 35 x 181 mm) |
| Headphone Outputs | 2 (6.35 mm and 3.5 mm) |
| Inputs | 2 XLR mic/line, 2 6.35 mm line/instrument, optical ADAT/S/PDIF, USB |
| Outputs | 2 XLR line, 2 headphone |
| SINAD | 108 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
| Weight | 1.5 lbs (680 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons