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B&C ME464
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<blockquote data-quote="Chris Burns" data-source="post: 216186" data-attributes="member: 11386"><p>Nick how are you making out with this?? </p><p></p><p>I’m looking to have a box, similar to the PMs that gets the 100-400 range, 2 measly octaves, enough sensitivity and ultimately overall output capability to slightly exceed that of the 464, so that you can just maximize the output capability of the ME464/DCX464 which is about 107db overall and a total summed output of 380w 260/120 at 107db/w/2.83v. </p><p></p><p>That being said, you can get that out of 4 ordinary vented 10s (Pick a manufacturer that will give you 95db avg sensitivity per driver- 18S, B&C, Beyma, and Faital- and possibly a pair of 12s (probably a 12NDL88 tuned for 80) but definitely 4 12s (12NDL76 tuned 80). You could get that from a pair of 15s as well and just cut down the B&C full range box size and use a pair of 15NDL88s (possibly even the 76s don’t know about excursion limits there) tuned for 80hz, which will get you to about 100db sens at 2.83v and enough power capability to achieve the goal of a top end of 134db, just about equalling the coax total summed output. Ideally we want to overshoot that 134 by 3db or more hence using 4 vented 12s bringing us to 139db. You can use the 30degree vertical angle employed by B&C in their design to bring the centers closer to 1/4wv (more toward 1/2 in reality here) however swapping the 15s with side by side horizontally aligned 10s or 12s. The 12s can be angled inward toward the midline of the box as well to achieve the same overall width of the horn baffle which would add a slight bit of gain to the bandpass and the horizontal, appx 160mm. add 36mm for the side panels for an overall appx 200mm width. YYou can keep the 12s vertical as well which brings the center to center distances to the center of the ME464 the same as the 15 angled. </p><p></p><p>I’m going to attempt a prototype build of an MTM design, with 2-12” drivers above and below the ME464. They will be modular which will also enable me to do an MMT arrangement with the cube of 4 below the 464 and compare performance. The tune will be 80hz for a HP goal of 90-100hz. </p><p></p><p>If someone is pretty proficient with horn design you can try adapting the PM90 into a PM464 using the same horn dimensions for the midrange in a wider format cab to accommodate the 464 setup. </p><p></p><p>Robert and Nick your designs have some real potential however for me the cost of 4 Beyma 10s at 330$ USD each plus the pretty intense build complexity of that 4 horn design is somewhat cost prohibitive, when a pair of 12NDL76s as proven in the PM do the job just fine at 440$ USD and a much less complex build. </p><p></p><p>Anyway going to try the plain vented 4 driver design and see how it models, first with an MTM config. </p><p></p><p></p><p>Sent from my iPhone</p></blockquote><p></p>
[QUOTE="Chris Burns, post: 216186, member: 11386"] Nick how are you making out with this?? I’m looking to have a box, similar to the PMs that gets the 100-400 range, 2 measly octaves, enough sensitivity and ultimately overall output capability to slightly exceed that of the 464, so that you can just maximize the output capability of the ME464/DCX464 which is about 107db overall and a total summed output of 380w 260/120 at 107db/w/2.83v. That being said, you can get that out of 4 ordinary vented 10s (Pick a manufacturer that will give you 95db avg sensitivity per driver- 18S, B&C, Beyma, and Faital- and possibly a pair of 12s (probably a 12NDL88 tuned for 80) but definitely 4 12s (12NDL76 tuned 80). You could get that from a pair of 15s as well and just cut down the B&C full range box size and use a pair of 15NDL88s (possibly even the 76s don’t know about excursion limits there) tuned for 80hz, which will get you to about 100db sens at 2.83v and enough power capability to achieve the goal of a top end of 134db, just about equalling the coax total summed output. Ideally we want to overshoot that 134 by 3db or more hence using 4 vented 12s bringing us to 139db. You can use the 30degree vertical angle employed by B&C in their design to bring the centers closer to 1/4wv (more toward 1/2 in reality here) however swapping the 15s with side by side horizontally aligned 10s or 12s. The 12s can be angled inward toward the midline of the box as well to achieve the same overall width of the horn baffle which would add a slight bit of gain to the bandpass and the horizontal, appx 160mm. add 36mm for the side panels for an overall appx 200mm width. YYou can keep the 12s vertical as well which brings the center to center distances to the center of the ME464 the same as the 15 angled. I’m going to attempt a prototype build of an MTM design, with 2-12” drivers above and below the ME464. They will be modular which will also enable me to do an MMT arrangement with the cube of 4 below the 464 and compare performance. The tune will be 80hz for a HP goal of 90-100hz. If someone is pretty proficient with horn design you can try adapting the PM90 into a PM464 using the same horn dimensions for the midrange in a wider format cab to accommodate the 464 setup. Robert and Nick your designs have some real potential however for me the cost of 4 Beyma 10s at 330$ USD each plus the pretty intense build complexity of that 4 horn design is somewhat cost prohibitive, when a pair of 12NDL76s as proven in the PM do the job just fine at 440$ USD and a much less complex build. Anyway going to try the plain vented 4 driver design and see how it models, first with an MTM config. Sent from my iPhone [/QUOTE]
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