![]() My preference would have been to use a upholstery felt (Photograph 5), but due to availability, the best I could do was a 50/50 cotton/acrylic felt, 3 mm thick. Wool felt is a common recommendation, but can be expensive. Ideally you will want to use a thick material that will absorb sound waves. For this reason you will want to cover the large surface of the magnet which will reflect sound waves. As a result any sound on the rear side of the speaker cone will be easily transmitted through to the front side of the cone and into the listening environment (this is a contributor to midrange shout). #Duct seal putty driver#In order to achieve high sensitivity, the Fostex FE206En driver uses low mass cones constructed from thin paper. Use Sound Absorbing Material on Reflective Surfaces Photograph 4: Speaker spokes dampened with rubberized asphalt. Again, you can quickly check the damping improvement by tapping the chassis with a screw driver and listening for how much quicker the ringing fades away. Apply the Blueskin self-adhering rubberized asphalt membrane to the spokes of the speaker chassis (Photograph 4). ![]() The paper peels away to expose the sticky asphalt compound. Photograph 3: Blueskin self-adhering rubberized asphalt membrane. This makes a thick damping strip with self-adhering asphalt on both sides. Adhesive contact cement (rubber cement) was used to glue the blue polyethylene film sides together (Photograph 3). In this modification example I used Blueskin SA which is a self-adhering membrane consisting of a SBS rubberized asphalt compound laminated on a blue polyethylene film. Mark uses a similar bituminous aluminium foil to dampen the driver frame in his FE206En double bass-reflex speaker build. You can use materials like duct seal (described above) or similar to Cascade V-MAXMP Aluminum Damping Sheets. Apply Dampening Material to Spokes of Speaker ChassisĪpply a pliable or rubber like material to the spokes of the chassis to help further dampen against ringing. Photograph 2: Duct seal putty used to dampen gap between the motor and the chassis. Check the improvement for yourself by tapping the speaker chassis with a screw-driver before and after the modifications and listen to how much quicker the ringing fades away. Photograph 2 shows an example of using duct seal to dampen the open gap between the motor and the chassis. Electrical duct seal is a non-hardening sealant that adheres to metal, masonry, wood or plastic. You should be able to find the duct seal in the electrical section of your hardware store and a block should be under $5 (Photograph 1). The duct seal will help dampen potential ringing. Fill Gap between Chassis and Motor with Duct Seal Puttyįill the open gap between the motor (magnet) and the chassis (frame) using duct seal. ![]() Photograph 1: Adhesive cement, Fostex FE206E fullrange driver, cotton felt, duct seal putty. ![]() #Duct seal putty drivers#For the small Fostex fullrange drivers see the page on modifications and tweaks for the Fostex FE103En fullrange speaker driver. These modifications and tweaks are suitable for the Fostex (FE166En, FE206En, FF165WK, FF225WK) drivers and can likely be applied to similar speaker drivers that also use a stamped steel chassis. The modifications and tweaks are generally focused around the idea that the light-weight stamped steel chassis can "ring" and at reducing sound wave reflections, particularly those directed towards the thin paper cone. For those who don't want to permanently alter the fullrange speaker driver, the modifications are reversible. Some examples of the simple and inexpensive modifications which can be made to these drivers are described below. ![]() There are many great modifications and tweaks for the Fostex FE206E and the newer FE206En model. Modifications and Tweaks - Fostex FE206E and FE206En Fullrange Driver ![]()
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