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Preamplifiers — Pro-Ject Pre Box S3
Description, images, technical data and specifications
Pro-Ject Pre Box S3
Image source — © Pro-Ject
The Pre Box S3 is a preamplifier from Pro-Ject, built with a convenient dedicated phono input and an outstanding signal-to-noise figure. The Pre Box S3 brings Pro-Ject's considered engineering to a space-efficient, feature-rich line-level signal control format.
Key specs that matter
Two single-ended inputs plus a dedicated phono input, with one single-ended output, are provided. Gain is 4.5dBu. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is an exceptional 110dB unweighted - among the most outstanding figures available in any preamplifier at this accessible tier - with total harmonic distortion plus noise under 0.007%. At 206 x 55 x 153mm and 1.02kg, the Pre Box S3 maintains a space-efficient preamplifier chassis.
Sound and use context
Expect exceptionally transparent signal handling reflecting the exceptional 110dB signal-to-noise figure, with the built-in phono input covering vinyl directly, packed into this remarkably compact chassis.
Pairing
The built-in phono input covers a turntable directly without needing a separate outboard phono stage.
Alternatives
Pro-Ject's own Pre Box S2 Analogue offers a phono-free alternative for buyers not needing vinyl playback within the same broader Pre Box catalogue.
Key specs that matter
Two single-ended inputs plus a dedicated phono input, with one single-ended output, are provided. Gain is 4.5dBu. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is an exceptional 110dB unweighted - among the most outstanding figures available in any preamplifier at this accessible tier - with total harmonic distortion plus noise under 0.007%. At 206 x 55 x 153mm and 1.02kg, the Pre Box S3 maintains a space-efficient preamplifier chassis.
Sound and use context
Expect exceptionally transparent signal handling reflecting the exceptional 110dB signal-to-noise figure, with the built-in phono input covering vinyl directly, packed into this remarkably compact chassis.
Pairing
The built-in phono input covers a turntable directly without needing a separate outboard phono stage.
Alternatives
Pro-Ject's own Pre Box S2 Analogue offers a phono-free alternative for buyers not needing vinyl playback within the same broader Pre Box catalogue.
Specifications
Model name
Pre Box S3
Analog inputs (balanced)
N/A
Analog inputs (single-ended)
2 + 1 Phono
Analog outputs (balanced)
N/A
Analog outputs (single-ended)
1
Gain (dBu)
4,5
Input sensitivity (mV)
N/A
Output voltage (V)
N/A
Input impedance (balanced) (Ω)
N/A
Input impedance (single-ended) (Ω)
N/A
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Maximum output level (balanced) (dBu)
N/A
Maximum output level (single-ended) (dBu)
N/A
Volume control range (dBu)
N/A
Frequency response low +/- 3dB (Hz)
20
Frequency response high +/- 3dB (Hz)
20 000
Signal to Noise Ratio (SNR, unweighted) (dB)
110
Total Harmonic Distortion + Noise (THD+N) (%)
< 0,007
Dimensions (mm)
206x55x153
Weight (kg)
1.02
Official link
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