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<blockquote data-quote="Bennett Prescott" data-source="post: 41299" data-attributes="member: 4">Re: out of band eq filtersJay,Out of band EQ is to correct the response of the loudspeaker so it behaves better once crossover filters are added (or perhaps off axis). Many loudspeakers (especially subwoofers) have big peaks out of band, and instead of hiding them with a steep XO I EQ them out.If I want to affect phase out of band I use a different class or slope of XO filter, or else I use an all pass. You have to use some pretty big EQs to have the same effect.IMHO, the reason not to go after small magnitude aberrations is it wastes a lot of time, they may not actually exist, and they may not have any audible effect. Determining which ones do have an audible effect is why we listen when we measure. Determining which ones exist is why many mic positions can be your friend.Really cutting edge DSP has very wavy EQ to make the loudspeaker truly flat, but you and I are unlikely to have the time or resources to pull those kinds of tricks. Those are things that should be done by the manufacturer. Putting a loudspeaker in a room or an array you are not going to see any of those, you are going to see large trends especially in the LF. If you need to correct that kind of thing at the loudspeaker level you probably need a different loudspeaker.</blockquote>

[QUOTE="Bennett Prescott, post: 41299, member: 4"] Re: out of band eq filters Jay, Out of band EQ is to correct the response of the loudspeaker so it behaves better once crossover filters are added (or perhaps off axis). Many loudspeakers (especially subwoofers) have big peaks out of band, and instead of hiding them with a steep XO I EQ them out. If I want to affect phase out of band I use a different class or slope of XO filter, or else I use an all pass. You have to use some pretty big EQs to have the same effect. IMHO, the reason not to go after small magnitude aberrations is it wastes a lot of time, they may not actually exist, and they may not have any audible effect. Determining which ones do have an audible effect is why we listen when we measure. Determining which ones exist is why many mic positions can be your friend. Really cutting edge DSP has very wavy EQ to make the loudspeaker truly flat, but you and I are unlikely to have the time or resources to pull those kinds of tricks. Those are things that should be done by the manufacturer. Putting a loudspeaker in a room or an array you are not going to see any of those, you are going to see large trends especially in the LF. If you need to correct that kind of thing at the loudspeaker level you probably need a different loudspeaker. [/QUOTE]

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