What I have:
- A transformer rated at 150VA / 30V (center tapped) / 5A
- Speaker rated at 30W / 8 ohms (measured 6.3 ohms with my multimeter)
Will use class AB amplifier:
If I send +30V & -30V to this chip, I will get 45W at 1%THD+N:
Is it possible to keep +30V & -30V but limit the maximum power to 30W? Is it by playing with the gain (feedback resistor value)?
I read somewhere "...power amps at lower gains requires more input voltage to get the same power output, with the same speaker impedance".
How to adjust/calculate the gain so that I get a maximum of 30W output with +30V / -30V power supply?
Any advice would be much appreciated.