Progressive Audio A1 in the Test

With the new A1 wants progressive audio the more expensive predecessor A2 beat – the best transistor amp the stereoplay knows. Whether the bold plan succeeds?

  1. Progressive audio A1 in the test
  2. Data sheet

So start the usual mythical stories of high fidelity: despite the smaller power supply and lower power amplifier a David puts a thick Goliath amp with links in the Pocket – and so on and so on…

If Ralf Koenen, Chief Executive of the company is the progressive audio, such a love of praise, the stereoplay testers are however aware. After all, the Essen with the A2 provided the paragon of finesse and control already par excellence and thus the reigning Power amplifier reference.

Koenen took the best bids from the high end Bible anyway. Now comes an even upgradable advantage with the use of Siliziumcarbid-(sic-)Transistoren in the output stages.

“What the SiC nonsense?”, the tester had to can still stone after the Jubilee test of the first Carbidlers A2. Only a year later the new semiconductors but their way not only to photovoltaic power inverters, but – to take one example among many–have found too highly efficient satellite channels.

While Koenen or also amplifier veteran Nelson fascinate pass (our site; in the amp J2) specifically on a SiC-transistor, the Semisouth SJEP120R063A, less the impulse speed of 1200 Volt fixed types. Rather, their admiration is of impeccable, long sweeping curve which is similar to those of tubes Triodes. And other developers may need even a little while until the implementation of knowledge so the testers look at progressive audio A1 – the new even if he instead 18200 costs only 12000 euro – with more confidence than ever.

The Essenes of amps – both only with remote transmitter can be operated and equipped with two symmetrical and two coaxial inputs – are similar though. Yet Koenen refers to the fine, but crucial differences: “to optimally support the characteristic of the output transistors, I’ve turned to each component of precursors and on every conceivable screw. “”

So the expected designed stages, who directly provide XLR-comers and immediately after receipt for balanced coaxial, with higher quiescent current and reduced feedback work. This leads to a finer and softer distortion spectrum. Also, the circuit generates slightly more fire so that in the subsequent volume in terms of noise certainly nothing can burn.

Progressive audio moves in anyway as gently as possible. 16 double contact vacuum are used for damping in 0.75-decibel increments in addition to a handful of precision resistors ergo the sympathize.

Sensitive symmetric, stocked with easy-to-navigate field effect transistors circuits then raise the signals to a totally uncritical voltage level. Thicker FET colleagues press power then already properly so that high input capacity of SiC transistors can be unloaded without consequences to the beat of the music.

By the Silicon car Bildlern there is working and no negative counter clock partners only with positive voltage. That does not consider Koenen be disadvantage because the semiconductor in its amps in full A operating constantly at maximum quiescent current run – so alone upwards and can get down. Then, a bridge arrangement ensures increased usable power. So does the A1 only with Plustypen.

Less well: The undamped jagged pulse processing of the new transistors leads to the tendency to oscillate, which must stop with ultra-fixed control Koenen.

Of brakes could not talk in the listening room be. Only for female voices. Where inferior amps they flagrantly out forward slide or others they thicken and press to ground the singers via the A1 acted always exactly where they stood. Nothing rattled on the articulation. So breathed about Inga Lahdo on the re: jazzCD “electrified” (Infracom) always completely solved, blithely and freely.

Then it magically wonderful, with the bass lines do it themselves or keep track of how sensitively the E pianist puts his tone clusters in the rhythmic curves was all Righteousness of this amplifier. At all piano: sound for sound completely unscathed from mother of Pearl, felt and steel peeled out – like sparkling diamonds. Frank Chastenier would have while listening to his “songs I’ve always loved” his bright pleasure. And he would prefer sure the A1 when compared with the A2, which a whole corner was brilliantly and finer. Pop disciples could use but on the strammeren bass of the A2. And so there are now two references: A1 and A2 of progressive audio.

Progressive audio a-1

Manufacturer Progressive audio
Price €12000.00
Rating 60.0 points
Test procedure 1.0

Technical data and test results

General
Dimensions (W x H x D) 44,0 x 21. 0 x 42.0 cm
Weight 22.0 kg
Features
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 /
Loudness
Monitor switch
Recording selector switch audio
Network jacks switched / unswitched 0 / 0
Memory / storage automatic 0 /.
Sendersp. with aut. Sorting No
Connections
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 54.0 W / 30.0 W
Music performance stereo 4 ohm / 8 ohm 57.0 W / 32.0 W
Noise line 99.0 dB(A)
Review
Short conclusion With single version of the a-1 has progressive versio the sound basis of the merit of the 7 / 10 driven tested A 2 in the truest sense of the word at the top. Not so strong, offers A 1 never heard resolution and dynamic
Sound Absolute top class
Sound points analog
(maximum 70 points)
60
Sound points Netzwerk-In
(maximum 70 points)
0
Sound points USB-In
(maximum 70 points)
0
Measured values
(maximum 10 points)
7
Practice
(max. 15 points)
7
Valency
(maximum 10 points)
10
Overall rating (maximum 120 very good-84 points
Price-performance ratio Very good
tested in issue: 10 / 11

 

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