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Special Spider media parts, magnet service and coils


Featuring - Vastly greater radial tension in our special accouter with our clamps. -

The action of speaker diaphragms can be broken down into control and volition componentry factors. We are seeking to restore the control portion which was lost when speakers became higher power devices. Originally, the cloth spider holding down the voice coil was only a 10 to 30 watt RMS device. At that time the outer diameters of speakers was seldom larger then 12 inch. When higher total displacement together with larger diameters that dominated the center pole area with 3 and four inch coils became marketed, compromises in design had to be made. The pole became large partly to act as a guide for the piston action, and the clearance thus reduced to very small dimensions for the inside of the voice coil. The JBL used only essentially one size pole in all their 4 inch voice coil models. The number of speakers produced and adhering to this basic design innovation is very large. However without tension, volition alone cannot stabilize cone movement and tone is negitively affected due to negative feedback in the accouter material folding design as compared with my flat elastic tensive accouters. One complaint that prompted me to pursue this speaker type was the advice to buyers that if they put uncompressed low frequency (35 ot 80 hertz) into any speaker, even a $1000 1200 watt new speaker, it won't be able to handle more than 200 watts depending on crest factors.

This limitation seems out of date to me. The days when sound was sold like a new model car for it's unique unalterable sound profile are long gone. Furthermore, I knew that a tradition accouter diaphragm allows the moving mass to extend beyond the mechanical collision limit of the back of speaker magnet assemblies if the pleats flatten out from wear and tear. The newer materials are thicker and stronger and provide strength as well as high flexure properties. Cloth accouters have good flexure and bad strength in tension and compression. The low strength thinner materials do not absorb the shock of reaching the travel limit as well and the thin mesh makes a sudden tug on the moving mass at full extension in an instant, versus slower deceleration near the design limits with thicker material in larger mesh size, not to mention the added power handling of the added air flow through the mesh. To be more exact, the outer or larger front speaker surround is the typical way that travel is controlled. The normal linen accouter allows travel well beyond the design and damage limits, so that the stiffness of the outer surround is the main and only limit control, but it also has zero axiality control due to it's concentric pleats. The radial accouter only allows the moving mass enough total travel to reach the design limits. It is a classic reliability and failure prevention innovation. This technology is completely authentic and original, not copied or bought in the financial works and intellectual property world. It is made possible by improvements in the flexural and other mechanical properties of plastics. This way, a studio monitor can be constructed from parts sold here and any vintage JBL speaker, even if it was intended to have a special instrument sound profile instead of accurate flat full range with exceptional detail fidelity.

I think that I can (and have) designed some of the best stereo and home theater equipment that there is and collected associates who have done just as in the 'sound engineer' working man's job world.

Together we are seeking to build a future that has its roots solidly based on the proven JBL legacy speaker systems. These new systems will eventually encorporate positive piston guide componentry into the spider or accouter itself, reliveing the light inner rubbing of the voice coil on the center pole that controls and guides it as the weak steamed linen cloth provides volition in a very small package. The pole piece, for those unacquainted with our modifications, is 3.880 inches. American made aftermarket parts made more recently typically average about +0.024 inch difference in coil inside diameter. For instance a 2440 may measure 3.900" inside. A 2442 even less. The smooth inside may not make much noise if it rubs. The clearance of .012 to the pole, if expanded in some foreign made parts, results in rubs on the insulating voice coil cement on the outer side of the coils, from my observations of these quasi copies of JBL speakers.


I hope you will enjoy this effort to improve on old and good equipment that is being repurposed by many audio advocates.  If you have basic electronic skills, I hope to inspire new ways that are more reliable and inexpensive to connect Home Theater Components.  Yet, I don't want to hold the person's head in my hands like I am trying too hard to make it happen.  I always felt that professors are paid to give this kind of guidance while at the same time knowing full well that their guidance will be productive, safe and effective - even if it is more or less unappreciated or viewed as the simplification by process of elimination that it actually is.  But that, is in itself, the lesson history teaches best.  That even that is, inescapable, glamorous.

About Designing better accouter systems and their application to Home Theater  
Presently available :  2013 2 sizes of clamps and all sizes machined frames.

Customer approval - We need contractors and buyers to Make our research practical advising and requesting supply catalogues to list our systems!
Our current effors is to focus on the largest voice coil available and fit that into any size JBL speaker, except perhaps 10 inch ones. We hope this seemingly limited selection can be easier to understand in the light of the above explanatory statements and observations. A photo of this coil, advertised at 1200 watts (well thats a bit of a comparative metric), is reputed to be the best of breed.

'Our Best Aftermarket Voice Coil'


contact: email us for questions.


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