Originally Posted by John-Martin
What's the difference between frequency response and frequency bandwidth?
Frequency response is the measured dB or output power. If an amplifier says 200 watts per channel @ 8 ohms, from 20 – 20,000 kHz with no more than 0.05% THD, it means the amplifier can deliver 200 watts anywhere from 20 – 20,000 kHz.
Frequency Bandwidth is how high or how low the amplifier can produce frequencies. It does not mean the amplifier can deliver the same wattage as the frequency response. It just means the amplifier has the ability to play frequencies beyond 20 – 20,000 kHz if necessary. The wattage will be lower due to the limitations of the design. This applies to all amplifiers.
Loudspeakers follow the same principal. This is why there are –3 dB and, -10 dB figures listed on the specification sheet next to frequency response.