Even if an amplifier circuit does not have band-pass filters, there is a limit on the band of frequencies that it can pass. The lowest frequency is determined by the value of the coupling capacitors. The highest frequency is limited by any capacitance in parallel with the input and output.
To pass a pre-determined band of frequencies and block all others, high-pass and low-pass filters may be used.
If this band of frequencies is followed by an amplifier, it must be designed to pass the entire band of frequencies. The order of the frequencies doesn't matter.
Is a circuit a bandpass filter only when it's a high pass filter followed by a low pass filter? Or can it ever be a low pass filter and then a high pass filter (cascaded together)?
Does the order matter if it's then followed by a gain/amplifier stage?
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