{"product_id":"opus-audio-hds500-500","title":"Opus Audio HDS500-500 Studio Power Amplifier","description":"\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOpus Audio HDS500-500\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a British-made, dual-mono Class A\/B studio power amplifier that delivers 350W per channel into 8Ω and 500W per channel into 4Ω, combining fully linear power supplies, MUSE JFET input stages and lateral MOSFET output devices for precise, transparent studio monitoring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHandmade in Cornwall, the HDS500-500 draws on over 40 years of Opus Audio amplification heritage. Its entirely analogue signal path eliminates digital signal processing (DSP), preserving the integrity of the original audio signal. Designed for demanding professional audio environments, the amplifier combines traditional analogue engineering with refined component technology to deliver exceptional loudspeaker control, low distortion and accurate transient reproduction.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0707\/4915\/9716\/files\/Opus_Audio_HDS_Amp.jpg?v=1794259687\" alt=\"\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eDual-Mono Class A\/B Amplification\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe HDS500-500 employs a dual-mono Class A\/B architecture with independent, fully linear power supplies for each channel. This design minimises interaction between channels, improves stereo separation and supports consistent performance during demanding dynamic passages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe amplifier delivers 350W per channel into 8Ω and 500W per channel into 4Ω, providing substantial power for professional studio monitors and high-performance passive loudspeakers. Its Class A\/B topology combines the linearity associated with analogue amplification with the efficiency and power delivery required for critical listening applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eMUSE JFET Input Stages and Lateral MOSFET Outputs\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eHigh-performance MUSE JFET input stages provide the foundation for accurate signal amplification, supporting low-noise operation and faithful reproduction of subtle musical detail.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMetal-can lateral MOSFET output devices complement the input circuitry, delivering controlled power and stable amplification. Together, these components support the amplifier's wide frequency response, low distortion and natural presentation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe HDS500-500 maintains the engineering principles of classic analogue amplification while incorporating carefully selected semiconductor technology to meet modern studio monitoring requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eExceptional Loudspeaker Control and Damping Factor\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWith a damping factor exceeding 1,000 into 8Ω, the HDS500-500 provides exceptional electrical control over connected loudspeakers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis high damping factor helps minimise unwanted driver movement, particularly at low frequencies, supporting tight, controlled bass reproduction and accurate transient response. The amplifier maintains precision during complex musical passages, allowing studio monitors to reproduce dynamic changes with clarity and authority.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe result supports critical mixing, mastering and detailed listening, where accurate loudspeaker behaviour plays an essential role in reliable monitoring decisions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eDirectly Coupled Loudspeaker Outputs\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe HDS500-500 features directly coupled loudspeaker outputs without relays or inductors in the output signal path.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis approach removes additional components from the output path, reducing potential sources of signal alteration and supporting a direct electrical connection between the amplifier and loudspeakers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy prioritising signal integrity, the design helps preserve the tonal balance, dynamic contrasts and fine detail of the original recording without introducing unnecessary sonic character.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e100% Analogue Signal Path with No DSP\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe HDS500-500 maintains a completely analogue signal path, with no digital signal processing, digital conversion or DSP-based correction.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis design prioritises direct signal amplification and allows the amplifier to reproduce audio without additional digital processing stages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts traditional analogue architecture makes it particularly suitable for professional monitoring systems where engineers require consistent, predictable amplification and an accurate representation of the source material.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eWide Frequency Response and Low-Noise Performance\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eA frequency response of 5Hz to 60kHz extends well beyond the conventional audible spectrum, supporting accurate reproduction across the audio bandwidth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe amplifier achieves a signal-to-noise ratio exceeding 116dB, helping maintain a quiet background that reveals low-level recording detail. Crosstalk performance exceeding 102dB further supports channel separation and stable stereo imaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA specified THD figure of 0.003% at 1kHz into 8Ω reflects the amplifier's emphasis on low-distortion signal reproduction, allowing engineers to assess recordings without excessive amplifier-induced colouration.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eProfessional Studio Integration\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe HDS500-500 features an input sensitivity of 2.2V RMS for full rated power and an input impedance of 10kΩ, supporting integration with suitable professional monitoring controllers, preamplifiers and line-level sources.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts 2U chassis measures 438mm wide and 520mm deep, with an approximate weight of 30 to 35kg. The substantial construction accommodates the amplifier's fully linear dual-mono power supply architecture.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHandmade British engineering and a six-year warranty reinforce the HDS500-500's focus on long-term reliability and professional performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAmplifier topology:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Dual-mono Class A\/B.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePower output into 8Ω:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 350W per channel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePower output into 4Ω:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 500W per channel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePower supplies:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fully linear, dual-mono configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInput stages:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e MUSE JFET.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOutput devices:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Metal-can lateral MOSFET.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSignal path:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 100% analogue, without DSP.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLoudspeaker outputs:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Directly coupled, with no output relays or inductors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInput sensitivity:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.2V RMS for full power.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInput impedance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 10kΩ.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFrequency response:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 5Hz to 60kHz.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSignal-to-noise ratio:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Greater than 116dB.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCrosstalk:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Greater than 102dB.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTotal harmonic distortion:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.003% at 1kHz into 8Ω, subject to confirmation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDamping factor:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Greater than 1,000 into 8Ω.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDimensions:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2U height, 438mm width and 520mm depth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWeight:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately 30 to 35kg.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eManufacture:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Handmade in the UK.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWarranty:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 6 years.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWhy Choose the Opus Audio HDS500-500?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHear recordings with greater confidence:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Transparent analogue amplification helps preserve the detail and tonal character essential for critical mixing and mastering.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMaintain tight, accurate bass:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An exceptionally high damping factor provides precise loudspeaker control for improved low-frequency definition.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePower demanding studio monitors:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Up to 500W per channel into 4Ω provides substantial headroom for professional monitoring applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eExperience natural analogue reproduction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A completely analogue signal path avoids unnecessary digital processing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIdentify subtle recording details:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Low-noise circuitry and excellent channel separation support precise stereo imaging and detailed listening.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInvest in British engineering:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Handmade UK construction, over 40 years of amplification heritage and a six-year warranty provide long-term reassurance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Opus Audio (Enigma Group)","offers":[{"title":"Default Title","offer_id":59134435524991,"sku":"ITM011648","price":10829.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/4915\/9716\/files\/Opus_500HDS_front.jpg?v=1794258057","url":"https:\/\/kmraudio.com\/products\/opus-audio-hds500-500","provider":"KMR Audio","version":"1.0","type":"link"}