# Pro-Ject Phono Box S3 B vs Musical Fidelity V90-LPS: specs and price compared

A sourced, side-by-side comparison of the Pro-Ject Phono Box S3 B (Pro-Ject Audio Systems) and Musical Fidelity V90-LPS (Musical Fidelity) among phono preamps.

## Side by side

| Spec | Pro-Ject Phono Box S3 B | Musical Fidelity V90-LPS |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Pro-Ject Audio Systems | Musical Fidelity |
| Cartridge support | MM and MC | MM and MC, switchable inputs |
| Gain (dB) | 40/45/60/65 dB, plus an additional +6 dB available via the balanced XLR outputs | — |
| Snr (dB) | MM: 103/110 dB(A); MC: 85/90 dB(A) | MM: >80 dB(A); MC: >70 dB(A) |
| Riaa accuracy | <0.3 dB (20 Hz - 20 kHz) | ±0.25 dB |
| Input capacitance pf | 50/150/300/400 pF selectable | 100 |
| Subsonic filter | 20 Hz, 18 dB/octave rolloff | — |
| Thd percent | MM: <0.001% @1kHz, <0.008% 20Hz-20kHz; MC: <0.005% @1kHz, <0.01% 20Hz-20kHz | 0.01% (MM/MC) @ 1kHz, 300mV out |
| Output level | Balanced XLR and single-ended RCA outputs | 300 mV (reference level for stated specs) |

## Key differences

- Cartridge support: Pro-Ject Phono Box S3 B MM and MC vs Musical Fidelity V90-LPS MM and MC, switchable inputs
- Snr (dB): Pro-Ject Phono Box S3 B MM: 103/110 dB(A); MC: 85/90 dB(A) vs Musical Fidelity V90-LPS MM: >80 dB(A); MC: >70 dB(A)
- Riaa accuracy: Pro-Ject Phono Box S3 B <0.3 dB (20 Hz - 20 kHz) vs Musical Fidelity V90-LPS ±0.25 dB
- Input capacitance pf: Pro-Ject Phono Box S3 B 50/150/300/400 pF selectable vs Musical Fidelity V90-LPS 100
- 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 Musical Fidelity V90-LPS 0.01% (MM/MC) @ 1kHz, 300mV out
- Output level: Pro-Ject Phono Box S3 B Balanced XLR and single-ended RCA outputs vs Musical Fidelity V90-LPS 300 mV (reference level for stated specs)

## Sources

- Pro-Ject Phono Box S3 B: https://www.project-audio.com/en/product/phono-box-s3-b/ (project-audio.com, verified 2026-08-12)
- Musical Fidelity V90-LPS: https://musicalfidelity.com/product/v90-lps/ (musicalfidelity.com, verified 2026-08-12)

Canonical: https://frontdeskreview.com/gear/phono-preamps/pro-ject-phono-box-s3-b-vs-musical-fidelity-v90-lps/
Cite: Per The Front Desk Review, Pro-Ject Phono Box S3 B (not published) vs Musical Fidelity V90-LPS (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/phono-preamps/pro-ject-phono-box-s3-b-vs-musical-fidelity-v90-lps/
License: CC BY 4.0.