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B&C ME464
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<blockquote data-quote="Peter Morris" data-source="post: 214490" data-attributes="member: 652"><p>Carl, the problem with 2 x PM60 a side is that like all standard point source boxes, they do not array perfectly and sonically one box will be better. In this case it will also have better pattern control.</p><p></p><p>The problem I see with what has been proposed so far is that the box does not go low enough. There is also a limit to what one HF driver can do. How much SPL you can push through one 1.4” throat without distortion could also be an issue.</p><p></p><p>By using a bigger HF horn it can go lower but the driver will have to do more work. Trying to keep up with 4 horn loaded 12” drivers may be asking a bit much – but I don’t know … I have not tried it.</p><p></p><p>One of the compromises with the PM90/60 is that it only went low enough (about 80Hz) to allow a 100Hz crossover to the sub, which I think is OK given what it was designed to do.</p><p></p><p>With the bigger 464 horn and therefore bigger box size, I expect PA applications will really be looking for more like an 80 Hz crossover to the sub. This is where it gets hard, trying to get good low frequency performance to allow an 80Hz crossover.</p><p></p><p>If you keep the box size reasonable, the mouth size for the LF section ends up being about the same size as the HF horn … that does not really add up to a good design.</p><p></p><p>The horn size is fine for big home theatre applications where you could use (for example) 2 x 15” drivers in a nice reflex enclosure for the low section. In this case it does not matter if you are not using the full capacities for the HF Horn / driver; size and weight are not that important.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 214490, member: 652"] Carl, the problem with 2 x PM60 a side is that like all standard point source boxes, they do not array perfectly and sonically one box will be better. In this case it will also have better pattern control. The problem I see with what has been proposed so far is that the box does not go low enough. There is also a limit to what one HF driver can do. How much SPL you can push through one 1.4” throat without distortion could also be an issue. By using a bigger HF horn it can go lower but the driver will have to do more work. Trying to keep up with 4 horn loaded 12” drivers may be asking a bit much – but I don’t know … I have not tried it. One of the compromises with the PM90/60 is that it only went low enough (about 80Hz) to allow a 100Hz crossover to the sub, which I think is OK given what it was designed to do. With the bigger 464 horn and therefore bigger box size, I expect PA applications will really be looking for more like an 80 Hz crossover to the sub. This is where it gets hard, trying to get good low frequency performance to allow an 80Hz crossover. If you keep the box size reasonable, the mouth size for the LF section ends up being about the same size as the HF horn … that does not really add up to a good design. The horn size is fine for big home theatre applications where you could use (for example) 2 x 15” drivers in a nice reflex enclosure for the low section. In this case it does not matter if you are not using the full capacities for the HF Horn / driver; size and weight are not that important. [/QUOTE]
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