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Danley SM80 and others shootout Monday January 14 at Danley in Gainesville, GA.
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<blockquote data-quote="Art Welter" data-source="post: 75600" data-attributes="member: 52"><p>Re: Danley SM80 and others shootout Monday January 14 at Danley in Gainesville, GA.</p><p></p><p></p><p>JR,</p><p></p><p>An oxymoron is a figure of speech in which incongruous or seemingly contradictory terms appear side by side.</p><p>Transient response is the response of a system to a change from equilibrium.</p><p>Transient response is not limited to high frequencies, though by definition the transient response time of a HF event is faster than a LF event. </p><p>If you find that incongruous, we have a semantic difference of opinion ;^).</p><p></p><p>An underdamped LF (or HF) response will "ring", the output level oscillates until finally reaching a steady-state value.</p><p>That type of ringing can make a sub sound "slow" even when the initial portion of the transient event is phase aligned with the top cabinet.</p><p>Danley's sub cabinet's phase response are all good (smooth) to well above the intended crossover region, and coherent alignment does sound better than incoherency, at least to me!</p><p></p><p>An example below of a band pass sub and an old Acoustic Research acoustic suspension speaker shows a big problem with the BP- it does not want to "play nice" in the 100 Hz crossover region, it goes through a 360 degree phase change in less than 1/3 octave. </p><p></p><p>Line up the phase response in the crossover region, it lags by a cycle below.</p><p>Decidedly less "punchy".</p><p></p><p>I spent a long time getting Phil Graham's Resopump BP design to work like the sims (it is very sensitive in the pass band) but ultimately found it was perhaps the worst sounding sub I'd ever built.</p><p>This is in sharp contrast to the usual syndrome where the most recent development always seems to be the best sounding...</p><p>Sold the driver to Ivan, he reported a far better bandwidth, sensitivity, and "punch" used in a different design.</p><p>I have since figured out some of the secrets, but there are always more.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 75600, member: 52"] Re: Danley SM80 and others shootout Monday January 14 at Danley in Gainesville, GA. JR, An oxymoron is a figure of speech in which incongruous or seemingly contradictory terms appear side by side. Transient response is the response of a system to a change from equilibrium. Transient response is not limited to high frequencies, though by definition the transient response time of a HF event is faster than a LF event. If you find that incongruous, we have a semantic difference of opinion ;^). An underdamped LF (or HF) response will "ring", the output level oscillates until finally reaching a steady-state value. That type of ringing can make a sub sound "slow" even when the initial portion of the transient event is phase aligned with the top cabinet. Danley's sub cabinet's phase response are all good (smooth) to well above the intended crossover region, and coherent alignment does sound better than incoherency, at least to me! An example below of a band pass sub and an old Acoustic Research acoustic suspension speaker shows a big problem with the BP- it does not want to "play nice" in the 100 Hz crossover region, it goes through a 360 degree phase change in less than 1/3 octave. Line up the phase response in the crossover region, it lags by a cycle below. Decidedly less "punchy". I spent a long time getting Phil Graham's Resopump BP design to work like the sims (it is very sensitive in the pass band) but ultimately found it was perhaps the worst sounding sub I'd ever built. This is in sharp contrast to the usual syndrome where the most recent development always seems to be the best sounding... Sold the driver to Ivan, he reported a far better bandwidth, sensitivity, and "punch" used in a different design. I have since figured out some of the secrets, but there are always more. Art [/QUOTE]
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