While the Korg Nutube triode input section does not transform the EPM-700’s into EPM-50’s they do share a large chunk of what makes the full Class-A models so special. Both models seem to be tuned to never sound forced or edgy and both models have a smooth and absolutely non-synthetic, non-electronic delivery with a completely natural timbre.
They have the superb bass and linearity that comes naturally to with the Class-D territory but when also taking the superbly fluid and refined treble into account and adding their sweetness and fabulously natural timbre, these hybrid amplifiers deliver up to 500 Watts of what closely resembles actual Class-A sound from a tiny cool-running box.
Their unforced delivery does favor partnering with expressive loudspeakers but when the match is right, these amplifiers turn in an utterly lifelike and superbly involving performance.
Gilberto Landete (Barcelona)
“I have returned to make another order of the atm-audio RCA cables because, after several months of using and comparing with the cables of my system, RCA from Furutech, I can affirm that they provide me with the same and exact quality and dynamics of details both cables. The overwhelming difference in price and being able to opt for a longer cable length is, for me, the best option.”
“atm-audio was previously unknown to me. It is a manufacturer committed to designing and producing exceptional electronics. Located in València in Spain, atm-audio has nevertheless been practicing its art for a few years and makes us discover its collection through a range of power amplifiers in Class A, in Class D, a line preamplifier in Class A, a MM/MC phono preamplifier, and a D/A converter.”
See the full review in audiophilefr.com (French).
“Fabulously organic and highly seductive and in no way mechanical or electronic, these fully Class-A amplifiers eschew the kind of overt control that can lead to the mechanical and clinical presentation that makes so many rivals sound technically impressive but emotionally rather uninvolving. They may not work ideally in every combination but that is because they are not designed to control the heck out of every speaker. Rather, they always let the music flow naturally and when the speaker-match is right they are nothing short of pure magic.”
“The Spanish firm Bonysound presented their Symphony II acoustic columns.
Driven by ATM electronics of which the PAM-2 preamp, PPM-1 phono stage, and PDAC1 DAC were housed in very small but precision-made full-aluminum enclosures. The mono power amps, too, are made of solid aluminum and were presented in an interesting two-tone color option.
Soundwise, the system played differently than what could potentially be expected from the speakers’ warm and all-wood appearance and the speakers actually seem to sound more in line with YG Acoustics or Gauder Akustik speakers. Extremely coherent, precise, transparent, and refined, this system was all about subtlety and precision. It’s not a warm and cuddly or rose-tinted sound. But neither was it hard or forward or edgy in any way. And although I have not heard any ATM gear before, it seems that these components are very transparent and highly refined.”
HIFI Live Magazine
“That no one expects to install this stage on their equipment and be immediately enchanted by its sound… because that is precisely its greatest virtue: let the rest of equipment “sound” without interference, without coloring, without underlining anything and without taking anything away. After that first moment we will discover that this amplification, despite its affordable price, is not only a very beautiful box, but possibly the last stage we need on our way looking for the ideal sound system. That we can have this technology at such a reasonable price and with such a striking aesthetic, thanks to a national manufacturer, is to be in luck: congratulations.”
HIFI Live Magazine
“The EPM-1 offers the advantages of a good power amplifier of transistors in Class A, with a rich and aggressive-free timbre that reminds me a little something of the best valve amplifications, but with a unknown strength and precision for vacuum tubes in bass, and a rare definition and extension in treble. During the weeks I’ve had it at home it has worked flawlessly. Except if you have very low sensitivity speakers and/or a very large room and a lot of fondness for the great musical works that we hear very loudly, this stage could be a perfect “end of the road” at any price and I can give you my highest recommendation .”