![]() Photograph 4: Modified and tweaked Fostex FE103En fullrange speaker driver. Screwfix: Thousands of products at trade prices FREE delivery available 7 days a week FREE click & collect in as little as a minute Hundreds of. ![]() To make a nice thick pad, use rubber cement and glue two or three felt pieces together (Photographs 3 and 4). In this example a 50/50 cotton/acrylic felt, 3 mm thick is used. Ideally you will want to use a nice thick material that will effectively absorb sound waves. This is to limit the reflection of sound waves in the enclsoure. That’s too heavy to lug around at around 60+ lbs with around 8 lbs of duct seal. The one made out of 1/4 plate is for in garage chronograph testing. It is always a good idea to cover the magnet with sound absorbant material. That NEMA 10 x 10 electrical pull box that I use on the stand, with the duct seal is right around 20 or so lbs, so that’s what gets hauled out for target shooting. Use Sound Absorbing Material on Large Reflective Surfaces Photograph 3: Rubber Cement / Adhesive used to hold Felt on FE103En. Photograph 2: Use Duct seal putty to fill gap between speaker motor and 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 chassis 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 against 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. For the larger Fostex fullrange drivers see the Fostex FE206E / FE206En driver modifications and tweaks page. These modifications and tweaks are suitable for the Fostex (FE83En, FE103En, FE126En, FF85WK, FF105WK, FF125WK) drivers and can likely be applied to similar small 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". 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 speaker drivers are described below. There are many great modifications and tweaks for the smaller Fostex fullrange speaker drivers. In such cases, here are seven popular alternatives to plumber’s putty. Small Fostex Fullrange Speaker Driver Modifications and Tweaks
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