The circuit in the figure below is suggested by Sanyo and provides 10 W power at 4 ohms and 6.8 W at 8 ohms. It can be used in the same configuration with power supply from 32 V to 8 ohms and 29 V to 4 ohms, in which case we will have maximum power, and the operating range is 50 to 20 000 Hz. The STK4017 water circuit is supplied in SIL enclosure of 10 pins needing a good heat radiator for this application. Among the applications indicated for this integrated we mention the use in electronic organs, since the power supply does not need to be symmetrical.
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