A series of ribs draws heat away from the iron pot to the cap which acts as a large heat sink. Air trapped behind the dustcap is forced past the coil and out these channels to convectively cool the coil. Thanks once again Michael. Port placement is a good call. I needed a bass cab suitable for covering the range from 20hz up to hz, all subwoofers seem to be designed to work to hz max.

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Further you’ve also got to contest with cone breakup modes as the frequency rises – this often being increaingly relevant to large area sub woofers.

I must admit that the help desk at JBL have been stunning, today I received a mail from their chief engineer basa assistance, what great customer service. Normally, basss surround and spider are designed to act together to provide restoring force and damping for the cone movement.

Thus, came the specification for a series of laminated coils of alternating copper and steel construction that would be applied to the outside diameter of the coil gap. However, running the specs through BassBox Harris Techthere isn’t a great deal of difference in the results.

The plan was to utilise them in dedicated cabs, crossing over at hz. While this can be dealt with in network compensation, the purist in Doug wanted that energy back. Over the coming months, you will be able to follow our progress here as we work to produce a system worthy of the name – The Project May loudspeaker.


Most dynamic loudspeakers use a voice coil that extends well above and below the magnetic gap to make the most use of the magnetic energy.

Michael – what’s the system in your avatar? Jerry designed a series of measures to dissipate heat.

Help and Advice needed by newbie

5100al The cab will be intended for use up to hz, the maximum allowed using my digital setup, and I intend using a ported enclosure. However, there is an open invitation to join this basx and become a participant. This is referred to as flux modulation and is a leading cause of distortion in any dynamic loudspeaker.

There’s no need for wadding, and in fact, it may well be detrimental to the operation of a reflex enclosure.

First, the pole piece and magnet have three channels embedded along their outer circumference. Do you have a recommendation for an alternative by chance? Without your help, I would never have been able to grasp the basics of cabinet requirements, with it at least I have a start. Ferrite is much more susceptible to flux modulation than Alnico. Looking at the K2, this appears to be very close to the dimensions of the bass enclosure used by JBL themselves in the flagship.

Current high end “Monitor” for Asian market. Thanks once again for your input. It has to do with the fact that the coil is not acted upon symmetrically by the permanent field once it is displaced from the rest position.


Addressing this would be the starting point for the AL design. For example, the flagship LE15 used a huge Alnico V slug magnet in a massive cast iron return structure. I wanted JBL sound. Next, an aluminum motor cap completely surrounds the magnetic return structure. I understand that they are available in Japan seperately, but I cannot find a supplier.

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I tried the Tact subs, but for my musical tastes, they were a little dry, lightening fast but anaemic. Results 1 to 12 of When used; particularly, in a sealed enclosure it can ‘increase’ the apparent volume by a process known as Isothermal Propagationbut in subwoofer enclosures i’ve yet to hear it make an audible difference.

Thank you gentlemen for your advice.

As you are going to a rather high crossover frequency, avoid equal internal dimensions.