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Junior Varsity
Another thread on using different subs
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<blockquote data-quote="Jay Barracato" data-source="post: 58324" data-attributes="member: 24"><p>Re: Another thread on using different subs</p><p></p><p>Here is some playing with the problem in Rayend. I have assumed that the outer stacks are approximately 30 feet apart, the tops are crossed over to the subs with a 2nd order L/R at 100 hz, and all of the subs are time aligned to the same base line. Of course this is also assuming (perhaps poorly?) that the Cobra system can be treated as a single source for the tops and subs, and that the levels of the L/R subs and the center subs are the same.</p><p></p><p>Here is the traditional power alley at 65 hz, 100hz, and 180 hz.</p><p></p><p>At 65 hz</p><p></p><p></p><p>[ATTACH]150628[/ATTACH]</p><p></p><p>At 100 hz</p><p>[ATTACH]150629[/ATTACH]</p><p></p><p>And 180 hz</p><p>[ATTACH]150630[/ATTACH]</p><p></p><p>Here is with the added subs centerfill</p><p>At 65 hz</p><p></p><p></p><p>[ATTACH]150625[/ATTACH]</p><p></p><p>At 100hz</p><p></p><p>[ATTACH]150626[/ATTACH]</p><p></p><p>And 180 hz</p><p></p><p></p><p>[ATTACH]150631[/ATTACH]</p><p></p><p>Here is just the tops at 180 hz for comparison</p><p></p><p>[ATTACH]150627[/ATTACH]</p><p></p><p>When changing the relative levels between the L/R and center subs, it appears that it is better to have the center subs stronger than the L/R. As you go up to 12db difference the patterns seems to smooth out. (In Rayend, it seems that the stronger the signal the less resolution the program shows, so I made the 12 db difference by raising the center 6 db and lowering the L/R by the same.)</p><p></p><p>At 65 hz</p><p></p><p>[ATTACH]150632[/ATTACH]</p><p></p><p>At 100 hz</p><p></p><p>[ATTACH]150633[/ATTACH]</p><p></p><p>At 180 hz</p><p></p><p>[ATTACH]150634[/ATTACH]</p><p></p><p></p><p></p><p>From the models, it looks to me like it is possible to get the result desired if the center subs can simply be time aligned to the line through the L/R subs. Actually from playing with the models, it looks like having the center subs up to 30 ms behind the L/R subs does not make that big of a difference. I think it would be worth giving it a go and I would bet you can get something usable by ear.</p></blockquote><p></p>
[QUOTE="Jay Barracato, post: 58324, member: 24"] Re: Another thread on using different subs Here is some playing with the problem in Rayend. I have assumed that the outer stacks are approximately 30 feet apart, the tops are crossed over to the subs with a 2nd order L/R at 100 hz, and all of the subs are time aligned to the same base line. Of course this is also assuming (perhaps poorly?) that the Cobra system can be treated as a single source for the tops and subs, and that the levels of the L/R subs and the center subs are the same. Here is the traditional power alley at 65 hz, 100hz, and 180 hz. At 65 hz [ATTACH=CONFIG]150628.vB5-legacyid=4356[/ATTACH] At 100 hz [ATTACH=CONFIG]150629.vB5-legacyid=4357[/ATTACH] And 180 hz [ATTACH=CONFIG]150630.vB5-legacyid=4358[/ATTACH] Here is with the added subs centerfill At 65 hz [ATTACH=CONFIG]150625.vB5-legacyid=4353[/ATTACH] At 100hz [ATTACH=CONFIG]150626.vB5-legacyid=4354[/ATTACH] And 180 hz [ATTACH=CONFIG]150631.vB5-legacyid=4359[/ATTACH] Here is just the tops at 180 hz for comparison [ATTACH=CONFIG]150627.vB5-legacyid=4355[/ATTACH] When changing the relative levels between the L/R and center subs, it appears that it is better to have the center subs stronger than the L/R. As you go up to 12db difference the patterns seems to smooth out. (In Rayend, it seems that the stronger the signal the less resolution the program shows, so I made the 12 db difference by raising the center 6 db and lowering the L/R by the same.) At 65 hz [ATTACH=CONFIG]150632.vB5-legacyid=4360[/ATTACH] At 100 hz [ATTACH=CONFIG]150633.vB5-legacyid=4361[/ATTACH] At 180 hz [ATTACH=CONFIG]150634.vB5-legacyid=4362[/ATTACH] From the models, it looks to me like it is possible to get the result desired if the center subs can simply be time aligned to the line through the L/R subs. Actually from playing with the models, it looks like having the center subs up to 30 ms behind the L/R subs does not make that big of a difference. I think it would be worth giving it a go and I would bet you can get something usable by ear. [/QUOTE]
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