Myths and realities about Chinese amplifiers from Opera Audio .


In December 2019, I became the owner of two beautiful monoblock Cyber 845S and an equally beautiful preamp Opera Consonance Linear1 .

http://www.opera-consonance.com/products/eproducts_TS.htm

 

http://www.opera-consonance.com/products/amplifier/Cyber845S.htm


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The driver stage itself is very simple : E88CC, with an anode R= 8.2 K, cathode without a shunt = 470 ohms, the signal to the input flies directly, without anti-ringing .

Capacitors-0.1 UF and 0.47 UF x400v. see the link .https://www.hificollective.co.uk/components/auricap-xo-capacitors.html

Resistors cheap all set one firm-in anodes, cathodes and transitions-all together ....
Mono-block BY OPERA AUDIO in CHINA .

Measurement data: P = 10% claim. = 22 W (1 kHz) at Z1.= 9.3 K .     At ZD-18K, the output at Kg=10% = 15 W .

Band ( at 3.5 W ): 32hz-22000 Hz( -2dB) 24Hz - 26000 Hz (-3dB)

Band (-0.2 Hz ): 110 Hz - 9300 Hz.

Power band where distortion is less than 10% (more or less smooth sine wave) :

20 Hz : 3.5 W .

30Hz : 6.7 W

50Hz : 13.7 W

100Hz or more :21W

1 kHz : 22 W

10 kHz : 15.1 W

20kHz : 8.9 W .

Lundal LL1680 outputs on 5 mA (Liu put them under 101D), are in the OPERA AUDIO preamp .  Naturally, in the parameters at yourself an utter deception, as if the lundal utilities are not written for the Chinese.  

http://www.lundahl.se/wp-content/uploads/datasheets/1680.pdf ( 0, -1.5 DB 😞 15Hz-45000 Hz ( 4:1)

http://www.opera-consonance.com/products/eproducts_TS.htm

At the entrance, they put a lundal ""masterpiece" " - LL1922, KTR : 1: 4, the TRANS is loaded at RG =100k .  

The question is what will be the input impedance of the preamp with such LL 1922, despite the fact that Mr. Liu wrote-600om .   Question, what does a man smoke ?

For clarity, so that dear neophytes understand the whole false essence of Chinese audio, the official data on monoblocks, where one of the parameters :: - 3dB : 5Hz ... 47.000 Hz Ofic. website. http://www.opera-consonance.com/products/amplifier/Cyber845S.htm

In terms of power, even with an increased input supply voltage, the power output was only 22 watts (where else is 6 watts ?) and only 6.7 W (after which kg is more than 10%) - at 30 Hz.

And the real measurement : (- 3dB ) : 24Hz-26.000 Hz on cheap hardware without a name or gender . A ragged meander with a ledge at the transition point ""0" " - zero, a scanty inductance of 24 GN for 845
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