Amplifier Progressive Audio A-2

Progressive with the amplifier audio (18200 euros) A-2 a new type of transistor will make his debut, composed of silicon and carbon. Molten voltage came up during the hearing test.

  1. Amplifier progressive audio A-2
  2. Principle circuit
  3. Data sheet

On July 29, 2009, the Fraunhofer Institute for solar energy systems in a press release announced the efficiency record for his new inverter: 99.03 percent. And they communicated that they use innovative silicon carbide field effect transistors of the Californian manufacturer SemiSouth for the shift work in the DC/AC converter. At the latest since HiFi-freaks would have to sit up. For some with amplifiers has this news from the photovoltaics world to do.

There’s also SiC field effect recently. And more efficient turn it, means that the transistor a) not just a little, but much faster and b) much poorer distortion acts. (The overdue research was then a) a factor of 10 to 15 and b) for the clanking distance of a simple basic circuit an improvement of up to 20 decibels. To all this add still heat resistance (up to 600 degrees) and considerable strength (up to 1200 volts).

Like this you can see that such a performance SiC-transistor with advantages in the current capability – actually more resembles the vacuum tube has always been extremely talented as his Silicon only old comrades.

Ralf Koenen, head of progressive audio, high end forged received thanks to his contacts to women’s people – in particular also to the Institute, which deals with the multi speaker wave field synthesis – relatively soon wind of the new miracle Semiconductor. In mid-2008, he could get the first SemiSouth batches (for just a little money).

Then, it was for a few months to develop a rabidly fixed control circuit in order to tame the new transistors. As with all their speed proved that they like tend to wild vibrations. Finally, they showed individual moods, so that the external operating point and offset automatic mandatory proved absolutely.

But how this exactly works – in the master silent is understandably, what in this case accepted even the stereoplay testers. And yet a difficulty: to date there is of the Silicon Carbidlern only these RV positive supply voltages, the all usual, quiescent current-saving was not eligible. That fit with the existing progressive-audio amps but. Because because he wanted to accept not the very lowest unbalance, Koenen tipped the output stages before SiC times exclusively with plus semiconductors. And although in a bridge configuration, in which a transistor with the one and another with the second pole of the connected box in the connection is available; and because each of the two transistors still must handle the full deflection upwards as downwards with very high bias current. That is translated into the jargon of the high end: “A bridge with two single ended class”. And now since early 2009 with progressive audio still comes “in silicon carbide and with rapid regulators”.

Whether with or without silicon carbide – he from stereoplay tested A 2 for 18200 euro (like A 1 with smaller capacity cost approximately half) which does not need to hide. The gewandete in aircraft aluminum, only via remote timer-to-use amplifier shows two separate circuit moves not only in the power amp, but overall a symmetrical structure with per channel. Plus and minus-XLR-comers (Cinchsignale be balanced at the entrance immediately) so their own, composed from individual transistors input buffer levels, find subito giving power and thus litter – defense force them. An extremely low-noise level of field effect counter clock lifted the vibrations so strongly that the subsequent level control can no longer fix them on the fault distance coat.

In collaboration with precision resistors eight double contact vacuum relays with one of 128 each 0.75 dB levels set per channel the desired adopts. What follows, again clean FETs are a working with eight power transistors driver stage, which can propel loose alone a speaker finally over here and over there. In the A-2, it serves only to reload the input capacitance of the SiC FETs – a job that she certainly succeeds with all due rigour compared with the heady journeymen.

And how she master it! This was reflected, for example, in “Bésame mucho” by the stereoplay-CD / SACD “Ultimate Tunes”. 1000 times belongs, but not so. The first strikes on the drums basin triggered not only the usual Zingern, but more beautiful sparkling, versatile overlapping and three-dimensionally propagating waves rings. The progressive audio provided the and very impressive whirl on the snare with almost frightening intensity. There’s banged not only in this or that place, because the listener took the bumps and scars of the poor eardrum. And if stretched again and firmer and firmer schlegelte, the drummer was involuntarily fear, that a stick soon gets stuck in the tight skin.

Like the rest of progressive audio left the bobbin then gracefully flink scurry about the vibraphone metal plates, it shone gloriously free and long and prismatic paradise colorful like never before.

Then it was time to welcome the bass, which, as it will allow only absolute top amplifier – can maintain his completely own Kingdom. And oops, because this turned a already Super elegant to a nosedive, to plunge down deeper and deeper and always more to bulge and himself more and more with substance to fill up. And while many competing amplifier plays only the angry flower, the whole thing took even more shape, fat and Schmacke.

Veil pulls away A 2

The Essen amplifier described the dispute between the bass and the meandering saxophone are slowly rocking up as also extremely exciting, at the same time he gave Linda Sharrocks voice new fine facets, especially plenty of life.

No question – with this title alone of amp working in the output without any feedback loop played already in the sky of the amplifier. The tester had to offer everything, to show that he not alone was it. AMP or Ayre-monos, which Yes, more than double the Thorens reference preamplifier with such a so expensive amplifier chain were building still more majestic strings waves the great Magico M5 with a Brahms Piano Concerto, while piano runs of still Unbenched still spherical and dissolved sparkled.

When transistor integrated amplifiers the sensation is A 2 by progressive audio but: the philosopher’s stone.

What you should know

Silicon Carbide: The connection with tetrahedral structure made of carbon and Silicon is very rare – as Moissanite in Meteor – or volcanic in nature. Industrially, it is produced in large quantities as carborundum abrasives. Harder than any type of steel, silicon carbide is scratched only by Diamond (Mohshaards 9.6 and 10.0). To do this, it shows high temperature strength, it decomposes in air at 2300 degrees. Very cheap semiconductor properties indicate a bright future of the material in the electronics.

Class A: At the output of the progressive audio A2 stereoplay identified 122 Watts into 4 Ohms. The aim is to keep in mind that running the amplifier in pure class-A mode.

Performance: For a class A amp offers A 2 then but very neat performance. Energy of similar magnitude hits the amp on its pages heatsink, which remain lukewarm.

Level: The display of the A-2 shows the set value in numbers. It a 0.75 decibels are a total of 128 levels. If required, you can expect the amplifier also on single push of a button.

After the arrival of the input signals in a symmetrical arrangement called “Instrument amplifier” is a current and voltage boost and then the 128-step volume control with extra double contact Reed Relays manufactured for progressive audio.

The driver stages of A 2 were designed with power transistors connected in the push-pull so strong that they can control the silicon carbide colleagues of the bridge output stages uncompromisingly. The SiC FETs are monitored by a control and for controls at the operating point.

Progressive audio A-2

Manufacturer Progressive audio
Price €17800.00
Rating 60.0 points
Test procedure 1.0

Technical data and test results

Dimensions (W x H x D) 44,0 x 21. 0 x 42.0 cm
Weight 23.0 kg
Genus (REC / GM) Integrated amplifier
Remote control available
System remote control / Adaptive /
Front panel Black / Silver / champagne / /
Front panel other FB.
Muting (via FB)
Tone controls / switched off /
Monitor switch
Recording selector switch audio
Network jacks switched / unswitched 0 / 0
Memory / storage automatic 0 /.
Sendersp. with aut. Sorting No
Input phono MM / MC /
High level RCA inputs / XLR 2 / 2
Digital inputs RCA / XLR 0 / 0
Boxes outputs A + B / switchable /
Headphone Jack
Pre-Out / main 0 /.
Recorder connections (a / from) 0
Processor input / output /
Unity gain input
Pre-Out subwoofer 0
Measured values
True sine wave power stereo 4 ohm / 8 ohm 122.0 W / 72.0 W
Music performance stereo 4 ohm / 8 ohm 130.0 W / 75.0 W
Noise line 86.0 dB(A)
Short conclusion Large, clean integrated amplifier, which can be operated only with the transmitter. Running in pure class-A – and bridge operation. Heralds a new amplifier era nd incredibly pure sound with novel transistors.
Sound Absolute top class
Sound points analog
(maximum 70 points)
Sound points Netzwerk-In
(maximum 70 points)
Sound points USB-In
(maximum 70 points)
Measured values
(maximum 10 points)
(max. 15 points)
(maximum 10 points)
Overall rating (maximum 120 very good-86 points
Price-performance ratio Very good
tested in issue: 7 / 10