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The Amp Box RS Mono has multiple specific characteristics which make it a true high-end amplifier. The amplifier has a fully balanced double mono design, a highly efficient energy saving PWM modules as well as a Tube buffer input stage.
I use four of these amplifiers in a system with active crossovers and with both vinyl and CD playback. The sound quality is marvellous compared to some much more expensive coventional class A/B amplifiers I once used. Because these amplifiers are digital they also waste very little energy and don't produce much heat in everyday use: an increasingly important characteristic in these times of high electricity bills. The sound quality is nevertheless 'analogue' in nature and is without any audible digital artefacts. I can't imagine anyone being disappointed with the sound quality. The bass extension is great and the rest of it is extremely detailed and provides a very clear and transparent window into the music. The term 'microdymanics' seems very appropriate, and has been mentioned by others: these units are extremely revealing of subtle details that I had never had the pleasure of hearing before. I have not used the upgraded power supplies to date and so cannot comment on those but I assume they create a lot more headroom if you like your music very loud.
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This is me two months into complete upgrade to the Pro-Ject "RS Line". I Purchased the mono amp boxes, pre-box, phono box, headbox and stream box.Straight away the sound stage that was present by these little project boxes was very very impressive. With the valve stages there is a warm sound presented with lots of depth and detail which suits my listening preference to a "T". The build quality is excellent and the size was a big plus point from an aesthetics and space perspective.There was "out of the box issue" with the Headbox but a quick email to the guys at Analogue Seduction and it was sorted straight away with an excellent no hassle/quibble replacement service. Great Service from the Analogue Seduction TeamI would have no reluctance in recommending the Pro-ject boxes to anyone. And anyone who has heard them is always left impressed. As I said, I am now 2 months in and they continue to surprise and delight.
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