Discussion
An amplifier is specified as follows.
| Parameter | Value |
|---|---|
| Supply | plus and minus 35 V |
| Load | 8 ohms |
| Class | AB |
Roughly what output power should be expected?
Answer: D
The peak output approaches the rail, less a volt or two of saturation:
\[ P \approx \frac{33^{2}}{16} \approx 68 \ \mathrm{W} \]
so about 70 W into eight ohms. Doubling that would need either twice the supply voltage or half the load impedance, which is why the same amplifier is often quoted at a larger figure into four ohms. Reading a power specification means checking which load it was measured into.
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