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The loudspeakers can be 4-ohm to 16-ohm, peak-output current can go up to 3A or even 5A in some cases, and peak-output power is from 10W to more than 40W, depending on the selected ICs, heat-sinks, power supply and configuration of output (dual-way or bridged amplifier).
This power amplifier usually does not need any adjustment, but it is important to have the gains of the output stages as mentioned earlier. For troubleshooting, check voltages at various test points listed in Table II.
Petre Tzv Petrov was a researcher and assistant professor in Technical University of Sofia (Bulgaria) and expert-lecturer in OFPPT(Casablance), Kingdom of Morocco. Now he is working as an electronics engineer in the private sector in Bulgaria.