Nelson pass slot loaded open baffle
I came across this post, which got me thinking that one day I should try to build my own pair of OB speakers. It doesn't seem overly complicated. Want a second or third opinion about your speaker cabinet design or other audio related problem? Post your question or comment on the Technical Discussion Board. Sep 03, · Since there will be some air loading effect, Fs might be lowered somewhat, but I would not expect a gross effect. Nelson claims an SPL increase, but I have not seen any evidence.
It is pretty simple stuff. The rear wave not so much. Anyone who can manage a hand held saber saw can make one out of a piece of plywood. The Down Sides There are two downsides to open baffles. It did not take me long to get good results because the mating of the woofer and tweeter were well behaved.
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The first figure shows the front blue and rear red near field response. The front was measured in the plan of the baffle, centered vertically and horizontally in the slot.
The rear was measured with the mic centered along the rear spine of the slot as shown to the left. This location was chosen because it is approximately the same distance for the acoustic center of the 4 drivers as the front mic position. The front and rear 1M response is presented above. Here the front and rear response is presented with along with the phase response.
Identical excess phase delay has been removed from both the front and rear response. The rear phase has been inverted so as to overlay the front phase. At low frequency there is close agreement between the front and rear phase but as the frequency rises it s apparent that the additional LP roll off of the rear response results in additional delay.
That is, the phase shift of the rear response is greater than degrees compared to the front. Recognize that a constant additional delay results in an additional phase shift that increases linearly with frequency.
Аньке было запрещено говорить, за исключением тех случаев, когда ей не задавали вопросы или не приказывали говорить. Восхитительная давалка в чулках с удовольствием прислуживает мужчине, и с удовольствием выполняет все его приказы, особенно те, когда надо взять член в рот. Завтра в 22. - тяжело выдохнула она, на секунду оторвавшись от дела.
- Теперь понимаете, почему вы под подозрением. После этого сучка накинулась на член партнера.
Resources saved on this page: Show 50 post s from this thread on one page. Originally Posted by GRollins http: Originally Posted by Nelson Pass http: I say that clearly that the acoustic load is asymmetric front vs back.
There are other examples of such things - How about a horn without an enclosure behind the driver? Clearly it works, and it works because the acoustic load on the diaphragm is not symmetric. Originally Posted by Radugazon http: Originally Posted by kropf http: To follow up my previous post The implication is that the driver diaphragm actually will move less for a particular SPL than the same driver in free space must move.
I submit that this is the source of most of the disagreement on the subject. Originally Posted by Godzilla http: Originally Posted by bocama http: Not that I pretend to understand marketing speak especially in english: Originally Posted by CLS http: Such LF air vibrations -- delivers an illusion that it's pressurizing the room, but of course it's not. Lack of front baffle area makes it much less efficient than expected. Page 15 of
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