{"product_id":"nuprimesta9xbl","title":"NuPrime STA-9X Stereo Power Amplifier, Black","description":"\u003cp\u003eThe NuPrime STA-9X is a compact stereo power amplifier in Class-A+D technology that can be switched to bridge into a powerful mono power amp.\u003c\/p\u003e\u003cp\u003eIt gets a lot of control out of very little footprint: 2 × 130 watts, 330 watts in mono mode, from a chassis that fits comfortably next to the router. If you believe a serious power amp has to weigh like an anvil, it's time to think again.\u003c\/p\u003e\u003ch2\u003eWhy the STA-9X?\u003c\/h2\u003e\u003cp\u003eThe STA-9X combines a Class-A input stage with a Class-D output stage and runs at a switching frequency of 750 kHz – roughly double that of many other Class-D designs. That keeps distortion well away from the audible range and delivers a fast, clear, cool-running performance. It stays quiet and unfussed in operation – three qualities you'd want from a good relationship too.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003e2 × 130 W, mono 330 W:\u003c\/strong\u003e Stereo into 8 and 4 Ω, or switched and bridged as a mono power amp with considerably more shove.\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eClass-A+D at 750 kHz:\u003c\/strong\u003e The high switching frequency pushes typical Class-D distortion out of the audible range – fast transients, clear top end.\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eXLR and RCA:\u003c\/strong\u003e Balanced and unbalanced input, matching practically any preamp.\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eMono-capable for later:\u003c\/strong\u003e Stereo today, add a second unit tomorrow – two STA-9X units make a genuine monoblock pair.\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e12 V trigger on\/off:\u003c\/strong\u003e Switches on and off cleanly with the rest of the system, ideal for tidy setups.\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eIsolation feet:\u003c\/strong\u003e Purpose-designed feet keep vibration away from the chassis and out of the sound.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eVideo\u003c\/h2\u003e\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/61xOKn8vvH4\" title=\"NuPrime Audio 9 series\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen\u003e\u003c\/iframe\u003e\u003c\/div\u003e\u003ch3\u003eWho is the STA-9X for?\u003c\/h3\u003e\u003cp\u003eFor anyone who wants to add a serious, space-saving power amp to their preamp or integrated amp with pre-out – and for anyone who wants to keep a clean upgrade path to mono power amps open. Also a lean, fast solution in an active or bi-amping setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHonestly:\u003c\/strong\u003e The STA-9X is a pure power amp with no volume control – without a preamp or an integrated amp with pre-out, nothing here will run. 2 × 130 W is comfortably enough for the vast majority of speakers; on extremely low-impedance, power-hungry speakers in stereo mode it will eventually hit its limits – then mono mode with two units is the answer. If you're expecting tube warmth, look elsewhere: the STA-9X sounds clean and neutral, not romantic.\u003c\/p\u003e\u003ch2\u003eOur verdict\u003c\/h2\u003e\u003cp\u003eThe STA-9X is our insider tip for anyone looking for a lot of power amp in very little space. At HD Zürisee in Wädenswil we appreciate it because it stays cool, quiet, and controlled while still hitting hard – and because it offers an honest upgrade path to a monoblock pair down the line. The trade press agrees: AVForums awarded the STA-9X 9 out of 10 points in 2024, and HiFi-IFAs also praised the combination with the DAC-9X. For its price it delivers a speed that makes many a much heavier beast look old.\u003c\/p\u003e\u003ch2\u003eTechnical data\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmplifier type:\u003c\/strong\u003e Class-A input stage + Class-D output stage, 750 kHz switching frequency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 2 × 130 W (stereo) \/ 1 × 330 W (mono) into 8 \u0026amp; 4 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak power:\u003c\/strong\u003e 2 × 170 W \/ 1 × 370 W into 8 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 1 × RCA (unbalanced), 1 × XLR (balanced), trigger-in 12 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Stereo speaker, mono speaker, trigger-out 12 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput impedance:\u003c\/strong\u003e 47 kΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput impedance:\u003c\/strong\u003e 20 mΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 29.1 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal-to-noise ratio:\u003c\/strong\u003e \u0026gt; 90 dB (at 1 W \/ 10 W \/ 100 W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD+N:\u003c\/strong\u003e 0.005 %\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 10 Hz – 50 kHz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMains voltage:\u003c\/strong\u003e 115 \/ 230 VAC switchable; slow-blow fuse 3 A \/ 250 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W × H × D):\u003c\/strong\u003e 235 × 55 × 281 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e STA-9X stereo power amplifier, power cable, quick guide\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow much power does the NuPrime STA-9X have?\u003c\/strong\u003e\u003cbr\u003eIn stereo mode the STA-9X delivers 2 × 130 W into 8 and 4 Ω. Switched and bridged, it works as a mono power amp with 330 W. That's clearly enough for the vast majority of speakers; for especially power-hungry speakers, two units can be combined as a monoblock pair.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I run two STA-9X units as mono power amps?\u003c\/strong\u003e\u003cbr\u003eYes. Each STA-9X can be switched into mono mode via a switch and then delivers 330 W. With two units you drive one speaker each with its own power amp – that noticeably improves channel separation, control, and imaging. A clean, step-by-step upgrade path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a preamp for the STA-9X?\u003c\/strong\u003e\u003cbr\u003eYes. The STA-9X is a pure power amp with no volume control. You need a preamp or an integrated amp with pre-out. It combines well, for example, with a NuPrime preamp or a DAC with volume control. We're happy to help you find the right match.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the STA-9X suit my speakers sonically?\u003c\/strong\u003e\u003cbr\u003eThe STA-9X sounds fast, neutral, and controlled – it rewards precise, dynamic speakers. It deliberately doesn't deliver tube warmth. Whether it suits your speakers, your room, and your taste is something we're happy to assess together with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy the NuPrime STA-9X at HD Zürisee?\u003c\/strong\u003e\u003cbr\u003eBecause we know which preamps and speakers make the STA-9X shine – from practical experience, not just the spec sheet. You get personal advice from Andy and Maurizio, service through our own technician, and support with setup and the mono upgrade. Reachable by phone, WhatsApp, or in Wädenswil.\u003c\/p\u003e\u003ch2\u003eGoes well with\u003c\/h2\u003e\u003cp\u003eA power amp is only one link in the chain – this rounds it out:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eA matching \u003ca href=\"\/en-ch\/collections\/vorverstarker\"\u003epreamplifier\u003c\/a\u003e or a DAC with level control\u003c\/li\u003e\n\u003cli\u003eThe right \u003ca href=\"\/en-ch\/collections\/lautsprecher\"\u003espeakers\u003c\/a\u003e for fast, controlled sound\u003c\/li\u003e\n\u003cli\u003eA clean connection: \u003ca href=\"\/en-ch\/collections\/kabel\"\u003ecables \u0026amp; connectors\u003c\/a\u003e (XLR or RCA)\u003c\/li\u003e\n\u003cli\u003eMore from the series: \u003ca href=\"\/en-ch\/collections\/nuprime\"\u003eNuPrime\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NuPrime","offers":[{"title":"Default Title","offer_id":52989544923472,"sku":"NP-STA-9X-BLK","price":1199.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0932\/3262\/8048\/files\/nuprime-sta-9x-stereo-endstufe-schwarz-frontansicht.jpg?v=1786618611","url":"https:\/\/hdzuerisee.ch\/en-ch\/products\/nuprimesta9xbl","provider":"HD Zürisee AG","version":"1.0","type":"link"}