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<blockquote data-quote="John Roberts" data-source="post: 41301" data-attributes="member: 126">Re: out of band eq filtersBy definition an out of band filter is out of band so not very useful for tweaking in band phenomenon. It is not unusual to use all pass filters, phase shift only with no amplitude change, to play games with crossovers and drivers. For room EQ, indeed the best correction is exact mirror image (actually reciprocal) of the flaw being fixed, On a good (lucky) day the corrective EQ will make everything one with nature again...&nbsp;&nbsp; It may be worth trying to understand the mechanisms causing the response error. EQ to damp feedback can be very narrow since the nature of feedback is very narrow band, the only m=limit to making it silly narrow, is temp changes in the room could change the speed of sound enough to have to retune the feedback frequency.So I/3 GEQ are for feedback only, room EQ should be broader, and preferably parametric. Sorry for no real info to speak of, but you&#039;re on the right track with broad gentle EQ for broad gentle problems. Sharp narrow for feedback and the like.JR</blockquote>

[QUOTE="John Roberts, post: 41301, member: 126"] Re: out of band eq filters By definition an out of band filter is out of band so not very useful for tweaking in band phenomenon. It is not unusual to use all pass filters, phase shift only with no amplitude change, to play games with crossovers and drivers. For room EQ, indeed the best correction is exact mirror image (actually reciprocal) of the flaw being fixed, On a good (lucky) day the corrective EQ will make everything one with nature again... It may be worth trying to understand the mechanisms causing the response error. EQ to damp feedback can be very narrow since the nature of feedback is very narrow band, the only m=limit to making it silly narrow, is temp changes in the room could change the speed of sound enough to have to retune the feedback frequency. So I/3 GEQ are for feedback only, room EQ should be broader, and preferably parametric. Sorry for no real info to speak of, but you're on the right track with broad gentle EQ for broad gentle problems. Sharp narrow for feedback and the like. JR [/QUOTE]

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