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FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems
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<blockquote data-quote="Art Welter" data-source="post: 17263" data-attributes="member: 52"><p>Re: FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems</p><p></p><p></p><p> </p><p>Message 3338 and the two plan drawings should answer construction details, but if not, I'll try to answer any specific questions.</p><p> </p><p>Just recently got to compare the ported Lab 2x12'' to a JBL SRX 728, using pink noise, BW filters set at 25 and 125 Hz, same drive level to each cabinet, measured at 2 meters, unused cabinet shorted out:</p><p> </p><p><img src="http://www.soundforums.net/attachment.php?attachmentid=361&d=0" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p> </p><p>I have moved the charts below up and down to conform with one watt one meter half space measurement, the EAW SB1000 is the left chart, JBL SRX 728 is center, the EV QRX right. Use the center chart lines for spl comparisons.</p><p> </p><p><img src="http://www.soundforums.net/attachment.php?attachmentid=362&d=0" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p> </p><p>These popular dual 18''s all have a large upper sensitivity advantage compared to the Lab 2x12''.</p><p> </p><p>All the cabinets still adhere to Hoffman's Iron Law, their sensitivity in the 30 to 40 Hz range is very similar.</p><p> </p><p>Below 40 the difference between the dual 18s and the 2x12'' is only about 3 dB, so a pair of the 2x12'', which take up less space than a single dual 18, would have about equal sensitivity down low.</p><p> </p><p>However, the 728 can not take close to full power down low without exceeding Xmax, while the Lab 12s can. Four Lab 12 can take the same power as two of the JBL 18'', and will have less distortion down low.</p><p> </p><p>From previous listening experience, I'd reckon the JBL to be cleaner than the other two dual 18s when pushed hard.</p><p> </p><p>The Lab 12 design, having very flat response, does not require out of band EQ, so it ''plays well'' with with any top cabinets that have flat response at the crossover point. </p><p> </p><p>Makes getting things to sound ''real'' a lot easier, especially if setting crossover points ''by ear'', or using crossovers that don't have delay, EQ, or the ability to have different crossover frequencies between low and mid.</p><p> </p><p>Art Welter</p></blockquote><p></p>
[QUOTE="Art Welter, post: 17263, member: 52"] Re: FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems Message 3338 and the two plan drawings should answer construction details, but if not, I'll try to answer any specific questions. Just recently got to compare the ported Lab 2x12'' to a JBL SRX 728, using pink noise, BW filters set at 25 and 125 Hz, same drive level to each cabinet, measured at 2 meters, unused cabinet shorted out: [IMG]http://www.soundforums.net/attachment.php?attachmentid=361&d=0[/IMG] I have moved the charts below up and down to conform with one watt one meter half space measurement, the EAW SB1000 is the left chart, JBL SRX 728 is center, the EV QRX right. Use the center chart lines for spl comparisons. [IMG]http://www.soundforums.net/attachment.php?attachmentid=362&d=0[/IMG] These popular dual 18''s all have a large upper sensitivity advantage compared to the Lab 2x12''. All the cabinets still adhere to Hoffman's Iron Law, their sensitivity in the 30 to 40 Hz range is very similar. Below 40 the difference between the dual 18s and the 2x12'' is only about 3 dB, so a pair of the 2x12'', which take up less space than a single dual 18, would have about equal sensitivity down low. However, the 728 can not take close to full power down low without exceeding Xmax, while the Lab 12s can. Four Lab 12 can take the same power as two of the JBL 18'', and will have less distortion down low. From previous listening experience, I'd reckon the JBL to be cleaner than the other two dual 18s when pushed hard. The Lab 12 design, having very flat response, does not require out of band EQ, so it ''plays well'' with with any top cabinets that have flat response at the crossover point. Makes getting things to sound ''real'' a lot easier, especially if setting crossover points ''by ear'', or using crossovers that don't have delay, EQ, or the ability to have different crossover frequencies between low and mid. Art Welter [/QUOTE]
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FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems
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