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SH-50 limiters.
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<blockquote data-quote="Langston Holland" data-source="post: 35003" data-attributes="member: 171"><p>Re: SH-50 limiters.</p><p></p><p></p><p></p><p>I was going to mention that and what I went through to come up with something that made sense, but it would have been quite the rabbit trail. Maybe on another post, another day. My preference is to use a sine burst length </= the shortest event that can happen in use. Sine bursts because they are so easy to see deformation in with a scope or to plot harmonics (distortion) of.</p><p></p><p></p><p></p><p>This is interesting, I'd love to see the math on why a driver doesn't behave like the display on a scope - i.e. changing frequency has no affect on amplitude. We certainly need increasing output with decreasing frequency to perceive equal volume due to how our hearing is designed, thus a useful loudspeaker driver would have to be designed to have progressively greater excursion at progressively lower frequencies within its passband because of its constant radiating area. To the extent the driver/horn/box/room system isn't like this is the extent that we try to force it into being with EQ. How they pulled this off I don't know, whether by design or one of the laws of physics that happened to land in our favor - hope the math'll help...</p><p></p><p>It's also interesting in that it would mean the effective limit of a driver at the upper end of its passband would be an RMS only issue - convenient with compression drivers considering HF absorption with distance and lower humidity.</p><p></p><p>Nevertheless, within the passband, limiting voltage will obviously limit the driver's excursion. Going outside the bounds of the recommended passbands in frequency or slope certainly require new measurements and will result in lower or higher peak voltage thresholds. That is one of the cool things about the high slope linear phase filters in the Lake - the potential of additional good sounding SPL even at the same crossover frequency, though higher slopes usually allow one to move the crossover frequency upward a bit as well without damaging polar response.</p><p></p><p>===</p><p></p><p>Edit: the first of many (probably) rudely copied items, this from Linkwitz discussing the negatives of a 2nd order crossover to a midrange driver: "Driver cone excursion increases at 12 dB/oct with decreasing frequency for constant SPL, yet the crossover rolls off at only 12 dB/oct which leaves the excursion constant."</p><p></p><p>This confirm's Nick's contention that one octave lower results in 4 times the driver excursion.</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 35003, member: 171"] Re: SH-50 limiters. I was going to mention that and what I went through to come up with something that made sense, but it would have been quite the rabbit trail. Maybe on another post, another day. My preference is to use a sine burst length </= the shortest event that can happen in use. Sine bursts because they are so easy to see deformation in with a scope or to plot harmonics (distortion) of. This is interesting, I'd love to see the math on why a driver doesn't behave like the display on a scope - i.e. changing frequency has no affect on amplitude. We certainly need increasing output with decreasing frequency to perceive equal volume due to how our hearing is designed, thus a useful loudspeaker driver would have to be designed to have progressively greater excursion at progressively lower frequencies within its passband because of its constant radiating area. To the extent the driver/horn/box/room system isn't like this is the extent that we try to force it into being with EQ. How they pulled this off I don't know, whether by design or one of the laws of physics that happened to land in our favor - hope the math'll help... It's also interesting in that it would mean the effective limit of a driver at the upper end of its passband would be an RMS only issue - convenient with compression drivers considering HF absorption with distance and lower humidity. Nevertheless, within the passband, limiting voltage will obviously limit the driver's excursion. Going outside the bounds of the recommended passbands in frequency or slope certainly require new measurements and will result in lower or higher peak voltage thresholds. That is one of the cool things about the high slope linear phase filters in the Lake - the potential of additional good sounding SPL even at the same crossover frequency, though higher slopes usually allow one to move the crossover frequency upward a bit as well without damaging polar response. === Edit: the first of many (probably) rudely copied items, this from Linkwitz discussing the negatives of a 2nd order crossover to a midrange driver: "Driver cone excursion increases at 12 dB/oct with decreasing frequency for constant SPL, yet the crossover rolls off at only 12 dB/oct which leaves the excursion constant." This confirm's Nick's contention that one octave lower results in 4 times the driver excursion. [/QUOTE]
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