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<blockquote data-quote="Moble Enclosurs" data-source="post: 7598012" data-attributes="member: 634917"><p>Knowing that now, it seems to be due to linear excursion capabilities. Usually, when excursion is exceeded in a design, there is a loss of output from mechanical limitations being met. Just from some rough estimations, I gathered that in a 1 cubic ft enclosure, the excursion from this driver (with calculated specifications only), reaches xmax in a sealed design on 250W@4ohms@48Hz. Which means that anything below 48Hz is where you are having problems gathering at least even a smooth output from. You are getting around a resonant peak of 63Hz, which I would imaging sounds pretty great at that frequency with the velocity from the front of the driver. Efficiency peak is around 7% at most and is very narrowbanded, which means it will take a lot of power to get any output below the 48Hz mark, which is ironically at the peak 5%(of the 1-5% average) of a normal enclosure.</p><p></p><p>So, to fix this output from a sealed design, you will need to go smaller on the volume to control the excursion that is likely causing some distortion below 45Hz right now as it is, trying to push it. Normally, one would say that going larger will give you more low end, but this is why I enforce optimized enclosure specifications from my figures because if you end up going too large (which is possible even with a sealed design), then you lose compression capabilities of the driver and in return lose efficiency which relates to power limitation issues.</p><p></p><p>The best option here would definitely be going ported because this driver seems to enjoy a ported enclosure much more than sealed. BUT, if you were to keep sealed, go with a compression volume of .53 cubic ft (not including displacement) for optimum sealed output. If you find that the low end from that is still suffering.....it is not only due to personal preferences, but the fact that this particular driver works more efficiently in a conventional ported design......and not all do.</p><p></p><p>I hope that helps..and if you can, for others involved in the thread.........can you verify that the 48Hz mark and the 63Hz area shows some sort of relevancy to what you are hearing (within +/- 3Hz). Thanks!</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7598012, member: 634917"] Knowing that now, it seems to be due to linear excursion capabilities. Usually, when excursion is exceeded in a design, there is a loss of output from mechanical limitations being met. Just from some rough estimations, I gathered that in a 1 cubic ft enclosure, the excursion from this driver (with calculated specifications only), reaches xmax in a sealed design on 250W@4ohms@48Hz. Which means that anything below 48Hz is where you are having problems gathering at least even a smooth output from. You are getting around a resonant peak of 63Hz, which I would imaging sounds pretty great at that frequency with the velocity from the front of the driver. Efficiency peak is around 7% at most and is very narrowbanded, which means it will take a lot of power to get any output below the 48Hz mark, which is ironically at the peak 5%(of the 1-5% average) of a normal enclosure. So, to fix this output from a sealed design, you will need to go smaller on the volume to control the excursion that is likely causing some distortion below 45Hz right now as it is, trying to push it. Normally, one would say that going larger will give you more low end, but this is why I enforce optimized enclosure specifications from my figures because if you end up going too large (which is possible even with a sealed design), then you lose compression capabilities of the driver and in return lose efficiency which relates to power limitation issues. The best option here would definitely be going ported because this driver seems to enjoy a ported enclosure much more than sealed. BUT, if you were to keep sealed, go with a compression volume of .53 cubic ft (not including displacement) for optimum sealed output. If you find that the low end from that is still suffering.....it is not only due to personal preferences, but the fact that this particular driver works more efficiently in a conventional ported design......and not all do. I hope that helps..and if you can, for others involved in the thread.........can you verify that the 48Hz mark and the 63Hz area shows some sort of relevancy to what you are hearing (within +/- 3Hz). Thanks! [/QUOTE]
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