{"product_id":"nuprimeamgpra","title":"NuPrime AMG PRA Preamplifier, Grey","description":"\u003cp\u003eThe NuPrime AMG PRA is a purely analog preamplifier that controls volume via a highly linear MUSES72320 circuit and features four-step bass control and switchable phase control.\u003c\/p\u003e\u003cp\u003eIn short: this is the control center between your sources and the power amplifier – no digital detour, but a highly linear volume control instead. Few knobs, big effect.\u003c\/p\u003e\u003ch2\u003eWhy the AMG PRA?\u003c\/h2\u003e\u003cp\u003eA good preamplifier doesn't draw attention to itself – it adds nothing and takes nothing away. That is exactly what the AMG PRA aims for: separate circuit boards keep interference out, the two-stage gain (High\/Low) adapts it to different power amplifiers, and the switchable phase control keeps the signal correctly polarized.\u003c\/p\u003e\u003cp\u003eVolume is handled by a highly linear MUSES72320. According to NuPrime, at step 92 the output level matches the input level exactly (0 dB) – so the preamplifier does not attenuate the signal when you turn it all the way up.\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 PRA stands under the motto «Shape your listening experience»: with the bass adjustment you really are allowed to turn a knob on the preamplifier – here it is explicitly permitted.\u003c\/p\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cp\u003eOn the input side, the AMG PRA accepts balanced XLR and unbalanced RCA sources, each with 1 MΩ input impedance – behind the low-noise JFET input stage in Class-A design, which takes in the source gently. Volume is controlled by a MUSES72320. On the output side, 2 V via RCA and 4 V balanced are available – enough level for practically any power amplifier.\u003c\/p\u003e\u003cp\u003eThe highlight is the four-step «Active Low Frequency and Harmonic Gain» control: a targeted bass boost with which you compensate for small speakers or a sluggish room, without reaching for the equalizer right away. In addition there is a finely graduated loudness compensation for quiet listening sessions. It is operated by remote control for source and volume.\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 PRA for?\u003c\/h3\u003e\u003cp\u003eFor anyone who deliberately builds their system from a preamplifier and power amplifier and wants an honest, analog preamplifier with a few useful adjustments. Ideal as a partner to the AMG ONE and STA power amplifiers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHonestly:\u003c\/strong\u003e If you expect a built-in DAC, streaming or phono stage, this is not for you – the AMG PRA is purely analog and concentrates on preamplification. This very reduction is its advantage, but you have to want it.\u003c\/p\u003e\u003ch2\u003eOur verdict\u003c\/h2\u003e\u003cp\u003eThe AMG PRA is an understated, cleanly built preamplifier that pays off in the right combination. The Absolute Sound (Drew Kalbach, 2021) tested the AMG PRA together with the AMG STA and notes that the preamplifier and power amplifier share the same form factor and are clearly meant to work as a duo. In The Absolute Sound's Buyer's Guide 2024, according to NuPrime, the AMG PRA is listed under «The Greatest Bargains in High-End Audio». We at HD Zürisee in Wädenswil appreciate how quietly and neutrally it does its job.\u003c\/p\u003e\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e purely analog preamplifier (no DAC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput stage:\u003c\/strong\u003e low-noise JFET, Class-A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume control:\u003c\/strong\u003e MUSES72320 (highly linear); step 92 = 0 dB (input = output)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBass control:\u003c\/strong\u003e 4-step (Active Low Frequency and Harmonic Gain)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e switchable phase inversion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 2-stage – 10.10 dB (High) \/ 6.44 dB (Low); voltage gain 3.2 \/ 2.1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e XLR balanced and RCA, 1 MΩ each (nominal input 8 V XLR \/ 4 V line)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal output voltage:\u003c\/strong\u003e 2 V (RCA) \/ 4 V (XLR) @ 100 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 10 Hz – 200 kHz (+0 \/ -0.1 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD:\u003c\/strong\u003e 0.008 %\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal-to-noise ratio:\u003c\/strong\u003e 95 dB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoudness compensation:\u003c\/strong\u003e 2.2 dB (125 Hz) \/ 4.5 dB (100 Hz) \/ 5.3 dB (75 Hz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e separate circuit boards, 15 mm aluminum front panel, CNC-machined chassis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl:\u003c\/strong\u003e remote control for source and volume, programmable remote code\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 3.5 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\u003eIs the NuPrime AMG PRA an analog preamplifier?\u003c\/strong\u003e\u003cbr\u003eYes, the AMG PRA is a purely analog preamplifier without an integrated DAC. It accepts analog sources via XLR and RCA, controls the volume via a highly linear MUSES72320 circuit and passes the signal on to your power amplifier. Digital sources need a DAC in front of it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the bass control of the AMG PRA do?\u003c\/strong\u003e\u003cbr\u003eThe four-step Active Low Frequency control lets you raise the bass range in a targeted way. This helps compensate for small speakers or a difficult room without bending the rest of the sound. You choose the step to suit your speakers and placement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich power amplifier suits the AMG PRA?\u003c\/strong\u003e\u003cbr\u003eThe AMG PRA is matched to the NuPrime AMG power amplifiers – the AMG ONE mono power amplifier or the AMG STA stereo power amplifier. Thanks to the switchable phase control and two-stage gain, it also works with many other power amplifiers. We are happy to help you work out which combination fits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the AMG PRA have balanced XLR connections?\u003c\/strong\u003e\u003cbr\u003eYes. The AMG PRA handles balanced XLR as well as unbalanced RCA signals, each with 1 MΩ input impedance. On the output side it delivers 2 V via RCA and 4 V balanced. This lets it integrate cleanly into differently configured systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy buy the NuPrime AMG PRA at HD Zürisee?\u003c\/strong\u003e\u003cbr\u003eBecause a preamplifier is the heart of the system and has to match the power amplifier and speakers. We advise you on the right combination, check the levels and take care of setup 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 PRA is the control center – what you connect to it determines the character of the system:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower amplifier:\u003c\/strong\u003e The AMG power amplifiers are the obvious partners: two AMG ONE as monoblocks or the AMG STA-SE as a stereo power amplifier, bridgeable later. More on this at \u003ca href=\"\/en\/collections\/endstufen\"\u003epower amplifiers\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital:\u003c\/strong\u003e The PRA is purely analog. For streamers, PC or CD you need a \u003ca href=\"\/en\/collections\/dac\"\u003eDAC\u003c\/a\u003e in front of it – the AMG DAC from the same series fits; a \u003ca href=\"\/en\/collections\/streamer\"\u003estreamer\u003c\/a\u003e takes care of playback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeakers:\u003c\/strong\u003e With the bass adjustment, even smaller \u003ca href=\"\/en\/collections\/lautsprecher\"\u003espeakers\u003c\/a\u003e or difficult rooms cope better – we advise you on the combination.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e Where the source can do XLR, use \u003ca href=\"\/en\/collections\/xlr-kabel\"\u003eXLR cables\u003c\/a\u003e; otherwise \u003ca href=\"\/en\/collections\/kabel\"\u003ecables\u003c\/a\u003e with RCA fit.\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":52989544169808,"sku":"NP-AMG-PRA","price":1799.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0932\/3262\/8048\/files\/nuprime-amg-pra-vorverstaerker-frontansicht.jpg?v=1786609290","url":"https:\/\/hdzuerisee.ch\/en\/products\/nuprimeamgpra","provider":"HD Zürisee AG","version":"1.0","type":"link"}