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DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Max Warasila" data-source="post: 213149" data-attributes="member: 3845"><p>I am not Peter Morris, but after a cursory glance at that driver's spectifications, I would say that that driver could be used, but is beginning to stray from the ideal drivers available for this design. The MMS is notably lower and vas is higher. I threw all three drivers into hornresp to show how they compare to the original RCF MB12N351. First, the B&C 12NDL76:</p><p>[ATTACH=full]209010[/ATTACH]</p><p>Next, the 18Sound 12ND610:</p><p>[ATTACH=full]209011[/ATTACH]</p><p></p><p>So, could you use it? Yes, sound will come out. However, it's not what the cabinet was designed around, it provides no benefit in long term power dissipation over the 12NDL76 at a higher cost, and it'll have to be more aggressively high passed/limited due to the smaller Xmax.</p><p></p><p>I'd suggest just going with the B&C. Here in the states it's 40% cheaper than the 18sound, and provides similar if not better performance. I still think the RCF is the strongest performer due to the larger VC area, but the cost for that 2dB midrange improvement is about 30% and comes with a slight LF penalty due to reduced maximum excursion compared to the B&C.</p><p></p><p>As a quick follow up, the output relationship between the B&C and the RCF is shown below. The B&C is the gray trace:</p><p>[ATTACH=full]209012[/ATTACH]</p><p>As you can see, the limiting factor quickly becomes excursion below 300Hz. There's not much difference, really, however.</p></blockquote><p></p>
[QUOTE="Max Warasila, post: 213149, member: 3845"] I am not Peter Morris, but after a cursory glance at that driver's spectifications, I would say that that driver could be used, but is beginning to stray from the ideal drivers available for this design. The MMS is notably lower and vas is higher. I threw all three drivers into hornresp to show how they compare to the original RCF MB12N351. First, the B&C 12NDL76: [ATTACH type="full" alt="1572376337359.png"]209010[/ATTACH] Next, the 18Sound 12ND610: [ATTACH type="full" alt="1572376498956.png"]209011[/ATTACH] So, could you use it? Yes, sound will come out. However, it's not what the cabinet was designed around, it provides no benefit in long term power dissipation over the 12NDL76 at a higher cost, and it'll have to be more aggressively high passed/limited due to the smaller Xmax. I'd suggest just going with the B&C. Here in the states it's 40% cheaper than the 18sound, and provides similar if not better performance. I still think the RCF is the strongest performer due to the larger VC area, but the cost for that 2dB midrange improvement is about 30% and comes with a slight LF penalty due to reduced maximum excursion compared to the B&C. As a quick follow up, the output relationship between the B&C and the RCF is shown below. The B&C is the gray trace: [ATTACH type="full"]209012[/ATTACH] As you can see, the limiting factor quickly becomes excursion below 300Hz. There's not much difference, really, however. [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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