{"product_id":"pro-ject-head-box-rs-headphone-amplifier","title":"Pro-Ject Head Box RS - Headphone Amplifier","description":"Head Box RS is a reference quality headphone amplifier with fully balanced tube input stage (double triode tube 6922) and single ended, class A „FET (Field Effect Transistor)“ output stage. It offers balanced and unbalanced input as well as balanced and un-balanced by-pass connectors for using the pass-through input signal with other components.  \u003cbr\u003e\u003cbr\u003e\n\nVolume control consists of a precise volume regulator with matched resistance between left and right channel. \u003cbr\u003e\u003cbr\u003e \n\nA special output impedance selector allows to adjust output impedance in three steps 5, 20 and 50 ohms to achieve better im-pedance matching between amplifier and headphones. Some experiments with different positions of output impedance selector are highly recommended to get the ultimate sound experience for your headphone. \u003cbr\u003e\u003cbr\u003e \n\nAn advanced multi-stage power supply with four different output voltages is used to achieve the best possible S\/N ratio for out-standing reproduction of detail, dynamics and imaging with any dynamic headphone. \u003cbr\u003e\u003cbr\u003e  \n\nFeatures:-\u003cbr\u003e\n\n• Fully balanced double mono design \u003cbr\u003e \n\n• Tube input stage  \u003cbr\u003e\n\n• Class-A FET output stage \u003cbr\u003e \n\n• Switchable output impedance for ultimate performance \u003cbr\u003e \n\n• Superior low distortion \u003cbr\u003e \n\n• Low noise components for ultimate dynamic \u0026amp; detail \u003cbr\u003e \n\n• Output: 6,3mm socket \u003cbr\u003e \n\n• Full metal casing in silver or black\u003cbr\u003e  \n\n• Optional Upgrade: Linear power supply Power Box RS Uni 1 (or 4) for further improved sound quality \u003cbr\u003e\u003cbr\u003e \n\nSpecifications:-\u003cbr\u003e\n\nLine-level input\/output 1 pair RCA\/phono and 1 pair XLR each \u003cbr\u003e \nHeadphone jack 3-pole 1\/4 ‘‘ (6,3mm Ø) \u003cbr\u003e \nPower output 350mW \/ 32 ohms, 60 mW \/ 300 ohms\u003cbr\u003e  \nCrosstalk -58dB\u003cbr\u003e  \nSignal-to-noise -99dB\u003cbr\u003e  \nFrequency response 30Hz – 20kHz\/(+0,2dB; -0,05dB) \u003cbr\u003e \nTHD (IMD) 0,17% (XLR in, output impedance setting 5 ohms, load 32 ohms)\u003cbr\u003e  \nGain 9dB \u003cbr\u003e \nOutboard power supply 20V\/3A DC suitable for your country's mains supply \u003cbr\u003e \nPower consumption 1,3A DC \u003cbr\u003e \nDimensions W x H x D 206 x 72 x 200 (209) mm (D with sockets)\u003cbr\u003e  \nWeight 2150g (without power supply)  \n","brand":"Pro-Ject","offers":[{"title":"Silver","offer_id":57409455325516,"sku":"PROJECTHEADBOXRSS","price":582.5,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":57420925927756,"sku":"PROJECTHEADBOXRSB","price":582.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1053\/6891\/2204\/files\/Pro-Ject-Head-Box-RS-Silver.jpg?v=1777486165","url":"https:\/\/www.stoneaudio.co.uk\/products\/pro-ject-head-box-rs-headphone-amplifier","provider":"Stone Audio","version":"1.0","type":"link"}