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Re: Standing wave notch [message #19244 is a reply to message #19243] |
Mon, 14 May 2007 14:56 |
DMoore
Messages: 58 Registered: May 2009 Location: Seattle
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Baron |
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I think that LF drivers have a power-frequency bandwidth, that is, they are most efficient in certain topologies and that each combination of driver and loading topology is further bandwidth-limited or at least frequency-specific. Throw a crossover into the mix, and stir vigorously. Place in a room of unknown acoustic parameters... I too have been on the search for the so-far-still-elusive low-frequency response combined with the appropriate ability to "punch". Seems that if a particular driver is good at one end of the spectrum, it gives up the other. Getting a balance is a combination of the loading, the specifics of the driver and the crossover. The crossover is an important consideration in the mix, too. Room suck-out could be a culprit, but if you had punch in the first place, it is unlikely that it would be removed completely. My opinion is that it is the particular driver/loading/crossover combination. No clean answers to this one. DM
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Re: Back from Dallas and depressed ... [message #19251 is a reply to message #19221] |
Fri, 18 May 2007 14:00 |
hurdy_gurdyman
Messages: 416 Registered: May 2009
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Illuminati (1st Degree) |
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Steve, I assume you've already tried this, but, just in case, have you tried reversing the phase of your subwoofer? If the overlap region is near 80 Hz, and if the two are out of phase, there may be a cancelation in this region. Dave
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Re: Standing wave notch [message #19260 is a reply to message #19241] |
Mon, 21 May 2007 20:33 |
GM
Messages: 114 Registered: May 2009
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Viscount |
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Greets! Hmm, 'floor bounce' historically has been used to describe the interference of this standing wave's reflection to the speaker's direct radiation at the listening position, so you normally have two notches from it, though when measuring on-axis at 1 m the two typically sum to a single deeper, broader one. Standing waves are 1/2 WL issues, so ~1130/2/4 = ~141 Hz. GM
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