Pro-Ject Audio Systems
Pro-Ject Phono Box S3 B
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Best Phono Preamps · head-to-head
Pro-Ject Phono Box S3 B vs U-Turn Pluto 2
A sourced, side-by-side comparison. U-Turn Pluto 2 is cheaper at $129. Every spec and price links to its source.
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U-Turn Audio
U-Turn Pluto 2
$129
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Pro-Ject Phono Box S3 B | U-Turn Pluto 2 |
|---|---|---|
| US price | — | $129 U-Turn Audio direct price |
| Brand | Pro-Ject Audio Systems | U-Turn Audio |
| Released | — | — |
| Cartridge support | MM and MC | MM only |
| Gain (dB) | 40/45/60/65 dB, plus an additional +6 dB available via the balanced XLR outputs | 40 |
| Snr (dB) | MM: 103/110 dB(A); MC: 85/90 dB(A) | 90 dB(A) |
| Riaa accuracy | <0.3 dB (20 Hz - 20 kHz) | ±0.3 dB (20 Hz - 20 kHz) |
| Input capacitance pf | 50/150/300/400 pF selectable | 100 |
| Subsonic filter | 20 Hz, 18 dB/octave rolloff | Active subsonic filter |
| Thd percent | MM: <0.001% @1kHz, <0.008% 20Hz-20kHz; MC: <0.005% @1kHz, <0.01% 20Hz-20kHz | <0.005% (A-weighted) |
| Output level | Balanced XLR and single-ended RCA outputs | — |
Sources — Pro-Ject Phono Box S3 B: project-audio.com (verified 2026-08-12). U-Turn Pluto 2: uturnaudio.com (verified 2026-08-12).
What's the difference between the Pro-Ject Phono Box S3 B and U-Turn Pluto 2?
Where the two actually differ on the specs we track (7 of 8). Matching specs are omitted.
- Cartridge support: Pro-Ject Phono Box S3 B MM and MC vs U-Turn Pluto 2 MM only
- Gain (dB): Pro-Ject Phono Box S3 B 40/45/60/65 dB, plus an additional +6 dB available via the balanced XLR outputs vs U-Turn Pluto 2 40
- Snr (dB): Pro-Ject Phono Box S3 B MM: 103/110 dB(A); MC: 85/90 dB(A) vs U-Turn Pluto 2 90 dB(A)
- Riaa accuracy: Pro-Ject Phono Box S3 B <0.3 dB (20 Hz - 20 kHz) vs U-Turn Pluto 2 ±0.3 dB (20 Hz - 20 kHz)
- Input capacitance pf: Pro-Ject Phono Box S3 B 50/150/300/400 pF selectable vs U-Turn Pluto 2 100
- Subsonic filter: Pro-Ject Phono Box S3 B 20 Hz, 18 dB/octave rolloff vs U-Turn Pluto 2 Active subsonic filter
- Thd percent: Pro-Ject Phono Box S3 B MM: <0.001% @1kHz, <0.008% 20Hz-20kHz; MC: <0.005% @1kHz, <0.01% 20Hz-20kHz vs U-Turn Pluto 2 <0.005% (A-weighted)