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Junior Varsity
Subwoofer "Throw", Facebook... huh?
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<blockquote data-quote="Art Welter" data-source="post: 91429" data-attributes="member: 52"><p>Re: Subwoofer "Throw", Facebook... huh?</p><p></p><p></p><p>The biggest "cloud" one sees in most BFM measurements is the crayon he uses to smooth his traces ;^).</p><p></p><p>A FLH typically has several folds which tend to filter both even and odd order harmonics to the same extent as it's raw frequency response is rolled off on the top end compared to a BR.</p><p>Horn loading can increase output per watt, so the distortion can be lower per given SPL compared to BR.</p><p>Horn loading increases stress on the cone for a given excursion, so although a horn loaded design may have less distortion at low to medium drive levels, it may have more at high drive levels, while also increasing SPL.</p><p></p><p>As distortion rises with increased level, the output spectrum will reflect the same, there will be a rise in upper response compared to LF at high drive levels.</p><p>A FLH with a small compression chamber tends to limit excursion at high drive levels, BR ports tend to choke at high drive levels, the net result for both is similar.</p><p></p><p>Interestingly, tapped horns (at least mine :^)) choke more upper response at high drive level.</p><p></p><p>At any rate, different designs all have different excursion minima and maxima frequency locations, giving a different distortion signature when driven to Xmax and beyond, so even when equalized the same will have different sound when pushed to the max.</p><p></p><p>One other observation to make is even a single small horn loaded sub like many of the BFM designs or the Growler, or the DSL TH-Mini or TH-115 or 118 actually have a narrowing pattern in the upper end of the response compared to a BR. </p><p>Just as a 60 degree horn concentrates more SPL on axis than a 90 degree horn and thus has higher sensitivity, same goes for horn loaded bass Vs front loaded bass.</p><p>In a small room, the more narrow upper end dispersion the horn affords will put less of upper "kick" in the center compared to the wider BR, giving the impression that it "throws further" as one comes in to the "power alley" upper pattern a bit further back.</p></blockquote><p></p>
[QUOTE="Art Welter, post: 91429, member: 52"] Re: Subwoofer "Throw", Facebook... huh? The biggest "cloud" one sees in most BFM measurements is the crayon he uses to smooth his traces ;^). A FLH typically has several folds which tend to filter both even and odd order harmonics to the same extent as it's raw frequency response is rolled off on the top end compared to a BR. Horn loading can increase output per watt, so the distortion can be lower per given SPL compared to BR. Horn loading increases stress on the cone for a given excursion, so although a horn loaded design may have less distortion at low to medium drive levels, it may have more at high drive levels, while also increasing SPL. As distortion rises with increased level, the output spectrum will reflect the same, there will be a rise in upper response compared to LF at high drive levels. A FLH with a small compression chamber tends to limit excursion at high drive levels, BR ports tend to choke at high drive levels, the net result for both is similar. Interestingly, tapped horns (at least mine :^)) choke more upper response at high drive level. At any rate, different designs all have different excursion minima and maxima frequency locations, giving a different distortion signature when driven to Xmax and beyond, so even when equalized the same will have different sound when pushed to the max. One other observation to make is even a single small horn loaded sub like many of the BFM designs or the Growler, or the DSL TH-Mini or TH-115 or 118 actually have a narrowing pattern in the upper end of the response compared to a BR. Just as a 60 degree horn concentrates more SPL on axis than a 90 degree horn and thus has higher sensitivity, same goes for horn loaded bass Vs front loaded bass. In a small room, the more narrow upper end dispersion the horn affords will put less of upper "kick" in the center compared to the wider BR, giving the impression that it "throws further" as one comes in to the "power alley" upper pattern a bit further back. [/QUOTE]
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