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Audio and Video Talk
Acoustics & Room Treatment
What is killing my 900Hz to 2kHz repsonse?
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<blockquote data-quote="Timber_MG" data-source="post: 545457" data-attributes="member: 18"><p>You can clearly see the power response dip in the B&W as it crosses at about 4kHz. A moving gate obscures the room interaction though. A 90dB scale is a bit very generous, but here another example. 90dB scale but without a moving gate cleaning up the HF and smoothed 1/24th octave. This includes all reflections.</p><p></p><p><img src="http://i626.photobucket.com/albums/tt345/Timber_MG/room%20response.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The room decay</p><p></p><p><img src="http://i626.photobucket.com/albums/tt345/Timber_MG/room.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Attie, the way I interpret that measurement is that you need to treat your first reflections a bit. The toe in gave you more HF due to beaming of the tweeter. Some of the effects may also be baffle edge diffraction. The tweeter has more energy at crossover and the woofer a bit less. This is normal for a cone+dome. The room response has just as much if not greater magnitude, so it is somewhat difficult to guess what is the cause. A gated measurement on axis, at 15, 30, 45,90 and 180 degrees may be interesting, especially if done out doors.</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 545457, member: 18"] You can clearly see the power response dip in the B&W as it crosses at about 4kHz. A moving gate obscures the room interaction though. A 90dB scale is a bit very generous, but here another example. 90dB scale but without a moving gate cleaning up the HF and smoothed 1/24th octave. This includes all reflections. [IMG]http://i626.photobucket.com/albums/tt345/Timber_MG/room%20response.png[/IMG] The room decay [IMG]http://i626.photobucket.com/albums/tt345/Timber_MG/room.png[/IMG] Attie, the way I interpret that measurement is that you need to treat your first reflections a bit. The toe in gave you more HF due to beaming of the tweeter. Some of the effects may also be baffle edge diffraction. The tweeter has more energy at crossover and the woofer a bit less. This is normal for a cone+dome. The room response has just as much if not greater magnitude, so it is somewhat difficult to guess what is the cause. A gated measurement on axis, at 15, 30, 45,90 and 180 degrees may be interesting, especially if done out doors. [/QUOTE]
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Audio and Video Talk
Acoustics & Room Treatment
What is killing my 900Hz to 2kHz repsonse?
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