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Message: <blockquote data-quote="helotaxi" data-source="post: 2744067" data-attributes="member: 550915"><p>The above explanation is part of the answer but not always the case.  Active filtering is always going to be before the amp but passive may not always be after it.  Active filtering requires power input because it uses some kind of powered circuit to do the filtering.  Most use op amps.  Passive filters can be used at any time on the signal and use passive components (caps coils and resistors) to achieve the filtering.  Preamp passive filters aren't very common though.</p></blockquote><p></p>

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