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In Reply to: Just thinking about what would happen if he did? posted by Mechans on May 21, 2012 at 16:08:20:
...and lowering the lo-pass point (compared with the probably-carefully-chosen FPs the designer effected), thereby creating a substantial dip in output around the FP(s). Also, the the filters' slopes would be additive, so if the passive x-over had two 2nd-order slopes and one used 2nd-order slopes in the active filter, one would end up with 4th-order slopes--in addition to the 'hole in the middle'.
Of course, one could in the active filter use 1st-order slopes so as NOT to add much filtering and set the filterpoints 2 or 3 octaves away from the passive FPs so as to reduce the negative effects of double filtering, but then why bother? One would have gone to the cost and effort of buying the filter, cables, and maybe the extra amp(s), suffering the negative sonic effects of the active filter--and they ALL have negative effects--only to end up with still-bad double filtering.
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Follow Ups
- The filter points (FPs) would be additive, raising the high-pass point... - jeffreybehr 14:15:24 05/22/12 (0)
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