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<blockquote data-quote="Art Welter" data-source="post: 83841" data-attributes="member: 52">Re: TH118vsSB1000zBrandon,Thanks, you finally have done what I hoped Ivan Beaver would have done almost exactly two years ago, but has been too busy to do!I had questioned TEF measurements(as used by DSL and others)in this post:<a href="http://soundforums.net/varsity/957-why-do-tef-systems-read-3-5-db-high.html" target="_blank">http://soundforums.net/varsity/957-why-do-tef-systems-read-3-5-db-high.html</a>Some details about the comparison of the two cabinets:The SB 1000Zp uses 2 volt for a 102 dB half space sensitivity, the TH-118 2.83 volts for 108 dB sensitivity.Reducing the TH-118 sensitivity by 3 dB to account for the voltage difference leaves a 3 dB difference&nbsp; on paper, and rather different response curves.Your measurements indicate that DSL&#039;s and EAW&#039;s published sensitivity ratings,&nbsp; though using quite different measurement technique, are still remarkably close, within 1 dB.One thing sensitivity ratings won&#039;t show is distortion, the speaker used in the&nbsp; TH-118 has a lot more Xmax than those used in the SB 1000, and the SB 1000 speakers have more than the EVX180B&nbsp; speakers used in the more sensitive EV Xsubs that you found&nbsp; &quot;pathetic&quot; by comparison.Even though the three subs all have similar sensitivity, the EVX180B with only 6.4mm X max will &quot;run out of steam&quot; while adding lots of distortion at around 8 dB less output than the 15mm Xmax BC18SW115-4 used in the DSL TH-118.At 40 Hz, a difference of 8 dB sounds twice as loud to your ears, though adding lots of distortion by driving speakers above Xmax can make the inferior speaker sound louder, since our hearing is more sensitive to upper harmonics than the fundamental frequencies.As evidenced by the popularity of cabinets using a driver design far older than many who post here, low frequency distortion is still well accepted by many mixers of pop music.Art</blockquote>

[QUOTE="Art Welter, post: 83841, member: 52"] Re: TH118vsSB1000z Brandon, Thanks, you finally have done what I hoped Ivan Beaver would have done almost exactly two years ago, but has been too busy to do! I had questioned TEF measurements(as used by DSL and others)in this post: [url]http://soundforums.net/varsity/957-why-do-tef-systems-read-3-5-db-high.html[/url] Some details about the comparison of the two cabinets: The SB 1000Zp uses 2 volt for a 102 dB half space sensitivity, the TH-118 2.83 volts for 108 dB sensitivity. Reducing the TH-118 sensitivity by 3 dB to account for the voltage difference leaves a 3 dB difference on paper, and rather different response curves. Your measurements indicate that DSL's and EAW's published sensitivity ratings, though using quite different measurement technique, are still remarkably close, within 1 dB. One thing sensitivity ratings won't show is distortion, the speaker used in the TH-118 has a lot more Xmax than those used in the SB 1000, and the SB 1000 speakers have more than the EVX180B speakers used in the more sensitive EV Xsubs that you found "pathetic" by comparison. Even though the three subs all have similar sensitivity, the EVX180B with only 6.4mm X max will "run out of steam" while adding lots of distortion at around 8 dB less output than the 15mm Xmax BC18SW115-4 used in the DSL TH-118. At 40 Hz, a difference of 8 dB sounds twice as loud to your ears, though adding lots of distortion by driving speakers above Xmax can make the inferior speaker sound louder, since our hearing is more sensitive to upper harmonics than the fundamental frequencies. As evidenced by the popularity of cabinets using a driver design far older than many who post here, low frequency distortion is still well accepted by many mixers of pop music. Art [/QUOTE]

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