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Audiophile headphone amplifier!Practically a brand new unit, never used it. It comes with all its original accessories and package as you can see in the pics. Head Box S2 has enough power to unleash highest sound quality from any headphone. It features one RCA input for a source of your choice. Front-sided are two headphone jacks, one 1/4 inch for hifi headphones and one 1/8 inch for modern head- and earphones. For shared listening experiences both outputs can be used simultaneously. Its 725mW output power will deliver top quality sound and enough volume, even for those who wish to listen at loud volumes! Head Box S2 features a rich and full sound with plenty of dynamics and transparency.The enclosure is fully made of aluminium for highest aesthetics and to protect it effectively against electromagnetic interference and vibrations, which can cause unpleasant listening experiences.Suitable for demanding headphones6.35mm and 3.5mm headphone outputBypass RCA loop output for additional amplifierSuperior low distortionLow noise components for ultimate sound performanceSmall footprintBoth outputs usable simultaneouslyAluminium/metal sandwich casing protects against vibrations and electromagnetic interferenceThanks for checking!
Pro-Ject's Head Box series, like the compact II or newer E models, trades used for USD100-180 depending on condition and variant—older Head Box II units often dip under USD120, while the 2023-ish Head Box E with discrete circuitry holds firmer around USD140 new equivalents. At USD207 for an unspecified model in unknown condition, this listing feels ambitious, pushing 50% over typical used market without clear provenance or upgrades to justify it.
Buyers should verify the exact model (II, S, E, or earlier?) via serial numbers or photos, as power outputs and features vary wildly—check for the outboard AC/DC supply (16V essential, USD30-50 replacement) and test RCA ins/outs for clean passthrough. Probe for hum, channel imbalance, or switch wear, common in 5+ year units; demand output specs confirmed on demanding cans like 300-ohm loads.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Pro-Ject Audio Systems traces its roots to 1991 in Austria's Weinviertel region, north of Vienna, where founder Heinz Lichtenegger launched the brand amid the CD revolution. Kicked out of music school as a youth, Lichtenegger channeled his passion for analog sound into affordable, high-quality turntables at a time when vinyl seemed obsolete. His debut Pro-Ject 1, hand-assembled in the Czech Republic, earned rave reviews as a top high-end device, igniting a success story that relocated headquarters to Vienna before returning to Mistelbach in Lower Austria.
The brand excels in turntables, establishing itself as the world's largest and leading producer in that category, while expanding into a full spectrum of hi-fi components since 2000. Offerings include amplifiers, DACs, headphone amps, speakers, cables, and phono stages, all emphasizing essential sound reproduction with durable materials and minimalist design. Manufacturing remains European—primarily in Czechia, Slovakia, and Germany—prioritizing sustainability through local sourcing, short transport, and products built for longevity.
Pro-Ject holds a commanding niche as the go-to for mid-tier audiophiles seeking boutique European craftsmanship without extravagant pricing. Distributed in over 80 countries, it appeals to vinyl revivalists and discerning buyers who value analog purity, innovation, and value-driven performance over flashy excess, cementing its reputation as a pioneer in accessible high-fidelity.
See all Pro-Ject listings on RADAR.
