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Frequency Response/Contour EQ in full range systems.
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<blockquote data-quote="Charlie Hughes" data-source="post: 35366" data-attributes="member: 474"><p>Re: Frequency Response/Contour EQ in full range systems.</p><p></p><p>Ivan makes some good points, as usual.</p><p></p><p>Something else one should keep in mind is whether the target response curve, and the measurements being made to see if the target has been achieved, is the direct field of the loudspeaker system or the in-room response of the system. If we're talking about the direct field in an outdoor setting I would venture to say that something like Reinforced Contour from the L'Acoustics graph might sound better. However, if we're inside, but still talking about the direct field of the loudspeaker, one would also do well to consider the power response of the loudspeaker system. Typically this will have a primary effect on the perceived sound quality in the frequency region below 500 Hz. Of course this is room dependent. A direct field measurement that resembles something closer to the Flat contour curves may sound better than the other two, but this will depend on the power response of the system, the placement of the loudspeakers, and the reflective surfaces of the room.</p><p></p><p>When measuring the system response in a room below 300 Hz or so I think it's a good idea to do so with a longer, or no, time window so that reflections from the room actually get into the measurement. Of course an RTA would show the entire reverberant field. In this frequency region such a measurement may actually be more indicative of the perceived response of the loudspeaker system because the power response and room effects are included.</p><p></p><p>Sometime these distinctions are overlooked. I don't think they should be because they are not subtle.</p></blockquote><p></p>
[QUOTE="Charlie Hughes, post: 35366, member: 474"] Re: Frequency Response/Contour EQ in full range systems. Ivan makes some good points, as usual. Something else one should keep in mind is whether the target response curve, and the measurements being made to see if the target has been achieved, is the direct field of the loudspeaker system or the in-room response of the system. If we're talking about the direct field in an outdoor setting I would venture to say that something like Reinforced Contour from the L'Acoustics graph might sound better. However, if we're inside, but still talking about the direct field of the loudspeaker, one would also do well to consider the power response of the loudspeaker system. Typically this will have a primary effect on the perceived sound quality in the frequency region below 500 Hz. Of course this is room dependent. A direct field measurement that resembles something closer to the Flat contour curves may sound better than the other two, but this will depend on the power response of the system, the placement of the loudspeakers, and the reflective surfaces of the room. When measuring the system response in a room below 300 Hz or so I think it's a good idea to do so with a longer, or no, time window so that reflections from the room actually get into the measurement. Of course an RTA would show the entire reverberant field. In this frequency region such a measurement may actually be more indicative of the perceived response of the loudspeaker system because the power response and room effects are included. Sometime these distinctions are overlooked. I don't think they should be because they are not subtle. [/QUOTE]
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