8
Interesting trivial facts
It may interest you to know that the output voltage is 55 times the input voltage at maximum gain.
However the input signal current in the 20kOhm RCA input is only 38.8uA at full power, and the output
current is 10.7 Ampere at full power in 4 Ohm, as current gain is 275,000.
Power is voltage multiplied by current, so output power is 15,100,000 times larger than the power of the
input signal.
Yes, a
power
amplifier
is a suitable name for what it does.
And note that this input signal power is still more than 10,000,000,000 times more powerful than the
residual noise power at the input.
So in 4 Ohm, full output power is more than 151,000,000,000,000,000 times larger than the input noise
power.
Therefore do take care to place your signal cables apart from your loudspeaker cables. They should not
lie close together, and if they need to cross, they should cross at a 90 degree angle.
Do not use unscreened interconnect cables.
The current in the mains power cable is a very distorted version of the signal, and it contains very high
frequencies.
A special power cable can reduce radiation of interference, and it can improve your sound quality.
