{"product_id":"nuprimeamgsta","title":"NuPrime AMG STA-SE Stereo Power Amplifier, Grey","description":"\u003cp\u003eThe NuPrime AMG STA-SE is a Class-A+D hybrid stereo power amplifier that delivers 2× 130 watts into 8 ohms and can be bridged to mono operation for more power.\u003c\/p\u003e\u003cp\u003eThe abbreviation SE stands for Special Edition – NuPrime's revised version of the AMG STA. It combines a single-ended Class-A stage with a Class-D power section: the finesse of one world, the efficiency and power of the other. It sounds like an attempt to square the circle – and comes astonishingly close.\u003c\/p\u003e\u003ch2\u003eWhy the AMG STA-SE?\u003c\/h2\u003e\u003cp\u003eThe idea behind Class A+D: a single-ended Class-A input stage shapes the tone, while a double-feedback Class-D module delivers the power. The high switching frequency of over 700 kHz keeps the Class-D module clean, and because little heat is generated, the power amplifier runs cool and stable.\u003c\/p\u003e\u003cp\u003eThe whole thing is supplied by a linear power supply with a toroidal transformer – the reserve that makes the difference between “standing firm” and “collapsing” on powerful bass impulses. The JFET input stage with 1 MΩ takes in the preamplifier gently.\u003c\/p\u003e\u003cp\u003eNuPrime describes the AMG series as having fine detail, rich tone and spatial imaging – separates with a character of their own. The STA-SE stands under the motto «Power with poise»: strength with composure, instead of flexing muscles.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cp\u003e2× 130 watts into 8 ohms, 2× 200 watts into 4 ohms: enough control that even low-efficiency speakers don't flail about. The very low output impedance (20 mΩ) ensures a firm grip on the bass without the midrange drying out.\u003c\/p\u003e\u003cp\u003eNeed more? Bridged, the STA-SE works as a mono power amplifier with around 300 watts into 8 ohms (320 watts per amplifier into 4 ohms) – two of them then make a powerful monoblock pair. Switching is done with a stereo\/mono switch, input via XLR or RCA. This way the power amplifier grows with your demands.\u003c\/p\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\/SP-vdUpMYuk\" title=\"NuPrime Audio AMG 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 AMG STA-SE for?\u003c\/h3\u003e\u003cp\u003eFor anyone looking for a compact, powerful stereo power amplifier with the option of mono operation – ideal as a partner to the AMG PRA or AMG DAC. If you challenge your speakers, you will find plenty of reserve here.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHonestly:\u003c\/strong\u003e There are no sources, volume control or streaming here – the STA-SE is a pure power amplifier and needs a preamplifier in front of it. If you are looking for an all-in-one unit, you are better off with an integrated amplifier. If you deliberately separate preamplifier and power amplifier, you get a lot of power amplifier for the money here.\u003c\/p\u003e\u003ch2\u003eOur verdict\u003c\/h2\u003e\u003cp\u003eThe AMG STA-SE is an astonishingly powerful, cool-running power amplifier with a hybrid Class-A+D signature. Christiaan Punter tested the SE version in July 2024 for HiFi-Advice and awarded it the HFA Award: he said it improved on all the points he had criticized in the original STA, and sounds more natural than any other Class-D amplifier he has heard. We at HD Zürisee in Wädenswil like how confidently and unflustered it handles even loud passages.\u003c\/p\u003e\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Class-A+D hybrid stereo power amplifier (single-ended Class-A + double-feedback Class-D), bridgeable to mono («Direct-Inject-Bridge»)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching frequency:\u003c\/strong\u003e over 700 kHz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput stage:\u003c\/strong\u003e JFET, 1 MΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e XLR and RCA, stereo\/mono switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply:\u003c\/strong\u003e linear power supply with toroidal transformer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower (stereo):\u003c\/strong\u003e 2× 130 W @ 8 Ω, 2× 200 W @ 4 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower (mono, bridged):\u003c\/strong\u003e 300 W @ 8 Ω, 320 W per amplifier @ 4 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated\/peak current:\u003c\/strong\u003e 10 A \/ 15 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 28.3 dB (stereo) \/ 34.3 dB (mono)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity:\u003c\/strong\u003e 1.2 Vrms (stereo) \/ 0.95 Vrms (mono)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput impedance:\u003c\/strong\u003e 1 MΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput impedance:\u003c\/strong\u003e 20 mΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal-to-noise ratio:\u003c\/strong\u003e 100 dB @ 10 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD+N:\u003c\/strong\u003e 0.006 %\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 10 Hz – 50 kHz (±0.2 dB @ 8 Ω), 58 kHz @ -3 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W × H × D):\u003c\/strong\u003e 235 × 55 × 300 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.5 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2 years\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow much power does the NuPrime AMG STA-SE have?\u003c\/strong\u003e\u003cbr\u003eIn stereo operation the AMG STA-SE delivers 2× 130 watts into 8 ohms and 2× 200 watts into 4 ohms. Bridged as a mono power amplifier, it is up to 320 watts into 4 ohms. This lets it drive even more demanding speakers with ease.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I bridge the AMG STA-SE as a mono power amplifier?\u003c\/strong\u003e\u003cbr\u003eYes. The AMG STA-SE can be bridged into mono mode and then delivers around 300 watts into 8 ohms. This way you can build a powerful monoblock setup with two units or run one unit in stereo – depending on your system and speakers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Class-A+D hybrid concept mean?\u003c\/strong\u003e\u003cbr\u003eIt combines a single-ended Class-A stage with a double-feedback Class-D module. This is meant to unite the sonic finesse of Class A with the efficiency and power of Class D. The high switching frequency above 700 kHz and the JFET input stage keep detail and calm high.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich preamplifier suits the AMG STA-SE?\u003c\/strong\u003e\u003cbr\u003eThe AMG STA-SE is a pure power amplifier and needs a preamplifier in front of it. From the same house, the NuPrime AMG PRA fits, alternatively the AMG DAC with volume control. Thanks to the 1 MΩ input stage, it also works well with many other preamplifiers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy the NuPrime AMG STA-SE at HD Zürisee?\u003c\/strong\u003e\u003cbr\u003eBecause the power has to match your speakers and your room. We advise you on stereo or mono operation and the right preamplifier, and take care of installation and service with our own technician. Call us, write to us or drop by in Wädenswil.\u003c\/p\u003e\u003ch2\u003eGoes well with\u003c\/h2\u003e\u003cp\u003eThe AMG STA-SE is meant to be a power amplifier that grows with you – this is what the upgrade path looks like:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreamplifier:\u003c\/strong\u003e In front of it belongs a \u003ca href=\"\/en\/collections\/vorverstarker\"\u003epreamplifier\u003c\/a\u003e – the AMG PRA also brings an adjustable bass control. If you play digital sources, take the AMG DAC, which also handles the volume (\u003ca href=\"\/en\/collections\/dac\"\u003eDAC\u003c\/a\u003e).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpansion:\u003c\/strong\u003e Start with one STA-SE in stereo operation. If a second one is added later, you bridge both to mono – two \u003ca href=\"\/en\/collections\/endstufen\"\u003epower amplifiers\u003c\/a\u003e become a monoblock pair. Anyone who upgrades later hasn't overdone it, but planned ahead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeakers:\u003c\/strong\u003e With 2× 130 W into 8 Ω and 2× 200 W into 4 Ω, it is a solid basis for demanding \u003ca href=\"\/en\/collections\/lautsprecher\"\u003espeakers\u003c\/a\u003e – we will work out with you what suits your room and taste.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e Input is via XLR or RCA: \u003ca href=\"\/en\/collections\/xlr-kabel\"\u003eXLR cables\u003c\/a\u003e for a balanced preamplifier, otherwise \u003ca href=\"\/en\/collections\/kabel\"\u003ecables\u003c\/a\u003e with RCA.\u003c\/li\u003e\n\u003cli\u003eMore from the series: \u003ca href=\"\/en\/collections\/nuprime\"\u003eNuPrime\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NuPrime","offers":[{"title":"Default Title","offer_id":52989544202576,"sku":"NP-AMG-STA-SE","price":1999.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0932\/3262\/8048\/files\/nuprime-amg-sta-se-stereo-endstufe-frontansicht.jpg?v=1786610644","url":"https:\/\/hdzuerisee.ch\/en\/products\/nuprimeamgsta","provider":"HD Zürisee AG","version":"1.0","type":"link"}