{"product_id":"pro-ject-head-box-s3-b-headphone-amplifier","title":"Pro-Ject Head Box S3 B Headphone Amplifier","description":"\u003cstyle\u003e\n  .hb-tabs { margin: 18px 0; border: 1px solid rgba(0,0,0,0.12); border-radius: 10px; overflow: hidden; }\n  .hb-tabs input { display: none; }\n  .hb-tab-labels { display: flex; gap: 0; border-bottom: 1px solid rgba(0,0,0,0.12); background: rgba(0,0,0,0.03); }\n  .hb-tab-labels label {\n    flex: 1;\n    padding: 12px 14px;\n    cursor: pointer;\n    font-weight: 600;\n    text-align: center;\n    user-select: none;\n  }\n  .hb-panels { padding: 14px 16px; background: #fff; }\n  .hb-panel { display: none; }\n\n  #hb-headboxs3b-tab-1:checked ~ .hb-tab-labels label[for=\"hb-headboxs3b-tab-1\"],\n  #hb-headboxs3b-tab-2:checked ~ .hb-tab-labels label[for=\"hb-headboxs3b-tab-2\"] {\n    background: #fff;\n    border-bottom: 2px solid rgba(0,0,0,0.65);\n  }\n\n  #hb-headboxs3b-tab-1:checked ~ .hb-panels #hb-headboxs3b-panel-1,\n  #hb-headboxs3b-tab-2:checked ~ .hb-panels #hb-headboxs3b-panel-2 {\n    display: block;\n  }\n\n  .hb-panels h3 { margin: 18px 0 12px; font-size: 1.05em; }\n  .hb-panels p { margin: 20px 0 6px; }\n  .hb-panels ul { margin: 8px 0 20px 18px; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"hb-tabs\"\u003e\n\u003cinput checked id=\"hb-headboxs3b-tab-1\" name=\"hb-headboxs3b-tabs\" type=\"radio\"\u003e\n\u003cinput id=\"hb-headboxs3b-tab-2\" name=\"hb-headboxs3b-tabs\" type=\"radio\"\u003e\n\n\u003cdiv class=\"hb-tab-labels\"\u003e\n\u003clabel for=\"hb-headboxs3b-tab-1\"\u003eProduct Summary \u0026amp; Benefits\u003c\/label\u003e\n\u003clabel for=\"hb-headboxs3b-tab-2\"\u003eTech Specs \u0026amp; Box Contents\u003c\/label\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hb-panels\"\u003e\n\n\u003cdiv id=\"hb-headboxs3b-panel-1\" class=\"hb-panel\"\u003e\n\u003ch3\u003eProduct Summary\u003c\/h3\u003e\n\n\u003cp\u003eThe Pro-Ject Head Box S3 B is a high-end headphone amplifier designed for customers who want a more serious dedicated amp for both balanced and single-ended headphones. It is a strong option for desktop and hi-fi systems where clarity, channel separation and lower-noise performance matter more than just adding a basic headphone socket.\u003c\/p\u003e\n\n\u003cp\u003eA big part of the appeal is its fully balanced design. With both RCA and XLR inputs, plus balanced 4.4 mm and 4-pin XLR headphone outputs alongside conventional 3.5 mm and 6.3 mm sockets, the Head Box S3 B is built to suit a wide range of headphone setups while giving customers a clear route into higher-performance balanced listening.\u003c\/p\u003e\n\n\u003cp\u003eIt is also designed to feel like a proper hi-fi component rather than just a utility box. The full aluminium enclosure, strong measured performance and compact casework make it an appealing choice for customers who want a serious headphone amplifier that fits neatly into modern systems. For customers wanting a compact but genuinely ambitious headphone amp, the Head Box S3 B is an excellent choice.\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFully balanced topology is designed to deliver greater channel separation with lower noise\u003c\/li\u003e\n\u003cli\u003eSupports both balanced and single-ended headphones for wider system flexibility\u003c\/li\u003e\n\u003cli\u003eBalanced 4.4 mm and 4-pin XLR outputs make it a strong choice for higher-end headphone setups\u003c\/li\u003e\n\u003cli\u003eRCA and XLR inputs make it easier to integrate into desktop and full hi-fi systems\u003c\/li\u003e\n\u003cli\u003eStrong output capability helps it partner a wide range of headphones confidently\u003c\/li\u003e\n\u003cli\u003eCompact size makes it easy to place neatly into smaller systems and shelves\u003c\/li\u003e\n\u003cli\u003eFull aluminium enclosure helps shield the circuitry and gives the unit a more premium feel\u003c\/li\u003e\n\u003cli\u003eStrong option for customers wanting a serious headphone amplifier with modern balanced connectivity\u003c\/li\u003e\n\u003cli\u003e2 years manufacturers warranty, extended to 3 years if registered with Pro-Ject within 4 months of purchase\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv id=\"hb-headboxs3b-panel-2\" class=\"hb-panel\"\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eHeadphone Amplifier Details\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eProduct Type: Fully balanced headphone amplifier\u003c\/li\u003e\n\u003cli\u003eMax Power Output: 480 mW \/ 8 Ohms, 680 mW \/ 16 Ohms, 820 mW \/ 32 Ohms, 320 mW \/ 300 Ohms\u003c\/li\u003e\n\u003cli\u003eHeadphone Outputs: 3.5 mm, 6.3 mm, 4.4 mm balanced, 4-pin balanced XLR\u003c\/li\u003e\n\u003cli\u003eSignal to Noise Ratio: Greater than 115 dB A-weighted at 1 kHz\u003c\/li\u003e\n\u003cli\u003eTHD: Less than 0.002% at 1 kHz @ 500 mV input\u003c\/li\u003e\n\u003cli\u003eCrosstalk: Less than -81 dB at 10 kHz\u003c\/li\u003e\n\u003cli\u003eGain: 15 dB \/ 9 dB (RCA in \/ XLR in)\u003c\/li\u003e\n\u003cli\u003eFrequency Response: Less than -0.25 dB at 20 Hz - 20 kHz\u003c\/li\u003e\n\u003cli\u003eAnalogue Inputs: 1 pair RCA\/Cinch, 1 pair XLR\u003c\/li\u003e\n\u003cli\u003eAnalogue Loop Outputs: 1 pair RCA\u003c\/li\u003e\n\u003cli\u003eHeadphone Impedance: Minimum 8 Ohms\u003c\/li\u003e\n\u003cli\u003ePower Supply: 18 V \/ 1 A DC, 110 - 240 V, 50 \/ 60 Hz\u003c\/li\u003e\n\u003cli\u003eStandby Power Consumption: Less than 0.5 W\u003c\/li\u003e\n\u003cli\u003eColour Options: Silver or black\u003c\/li\u003e\n\u003cli\u003eMade In: Europe\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWeight \u0026amp; Dimensions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 20.6 x 5.5 x 15.3 cm (W x H x D)\u003c\/li\u003e\n\u003cli\u003eDimensions including sockets: 20.6 x 5.5 x 17.0 cm (W x H x D)\u003c\/li\u003e\n\u003cli\u003eWeight: 0.95 kg without power supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePro-Ject Head Box S3 B headphone amplifier\u003c\/li\u003e\n\u003cli\u003ePower supply\u003c\/li\u003e\n\u003cli\u003eProduct documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Pro-Ject","offers":[{"title":"Silver","offer_id":57914488848771,"sku":null,"price":329.0,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":57914488816003,"sku":null,"price":329.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0160\/4606\/3670\/files\/Untitled_3500x3500px_-2026-04-28T133044.297.png?v=1777379512","url":"https:\/\/www.holburnonline.co.uk\/products\/pro-ject-head-box-s3-b-headphone-amplifier","provider":"Holburn Online","version":"1.0","type":"link"}