This curve shape has much better group delay characteristics and self equalizes due to room gain very nicely. So, it may be worth experimenting with port length, using something like drain pipe, and final tune by ear. The net result is a woofer that arguably has lower levels of power compression than any other loudspeaker of its size. This became the design goal for the AL. Forty years later, and the tradition of excellence continues.

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Through innovative engineering eg. Jun 26, Messages: When I first saw what you wanted to do, especially the required bandwith up to HzI was a little concerned.

However, vent air displacement goes skyward – 1500wl it’d whistle and chuff – increasing the diamteter solves that, but you’d have to increase length to silly proportions. Based on that i’d suggest an internal volume of 2.

While this can be dealt with in network compensation, the purist in Doug wanted that energy back. Inthe engineers at JBL Consumer began development of a series of drivers that would push the limits of sonic accuracy. A large coil would be required, but to maintain the underhung topology, there would need to be a gap depth of unprecedented proportions.

He began a personal quest to rectify this heresy and quickly rallied the support of a number of website members.

Personally, 36Hz is fine, and with room gain will have useful output an octave below that be careful running very high power into it though, as the sub woofer will unload very quickly below tuning. Theres also a few links at http: For example, the flagship LE15 used a huge Alnico V slug magnet in a massive cast iron return structure.

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AL JBL image_b | AUDIO in | Pinterest | Audio and Bass

By johnaec in forum General Audio Discussion. Falcon Acoustics do one of mm by a max of mm using this in the given design would only raise the tuning by a couple of Hertz. Ports tend to stick to integer lengths, and 5″ length is a common off-the-shelf dimension – win ISD opts for 5″, which for the same enclosure volume would raise the tuning by a few Hertz.

Even getting the proper stuff wont break the bank. I understand that they are available in Japan seperately, but I cannot find a supplier. Over a one year period, virtually every loudspeaker manufacturer was forced to switch to more readily available ferrite magnets. I guess everything is in the tuning and with this in mind, I decided to mail JBL over the weekend.

: Pi Speakers ยป JBL AL

The one thing that is difficult to model accurately is room interaction. He is using the AL in a similar subwoofer for his home cinema setup and I think he expects to be the first of many. More significant is the “May” title in the name.

You could also consider a slot port – ie built as part of the enclosure. However local variance in the flux field was determined to 1500all in the voice coil gap, independent of variance in the global field. Any help would be much apreciated. Looking at the K2, this appears to be very close to the dimensions of the bass enclosure used by JBL themselves in the flagship.

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Help and Advice needed by newbie

Over the coming months, 15000al will be able to follow our progress here as we work to produce a system worthy of the name – The Project May loudspeaker. The time now is Current high end “Monitor” for Asian market. The focal point of this system was to be an Alnico magnet woofer with an underhung coil.

Classic 150a0l designs have a unique frequency response anomaly that is due to the coil topology. Any suggestions for cabinet dimensions, materials, and construction tips would really be apreciated. All times are GMT Nonetheless, Doug was not done in setting the design parameters for the AL.

That’s one other parameter, that the guy probably should have in order to compare that driver with others, for low bass reproduction purposes