Speaker Refoaming Instructions

*Click on the thumbnails for larger views*

New-Edge-It Kit	This is what the speaker repair kit will look like.
Gather Parts	Gather screwdriver, rubbing alcohol, utility knife, cotton swabs, and paper towels.
Rotten Foam	Speaker with deteriorated foam is ready for repair.
Remove Speaker	Remove speaker from cabinet.
Remove Wires	Note correct wire hook up (+ vs. -) for later installation.
Remove Gasket	Remove speaker gasket as shown (for most models).
Gasket Removed	This is how the speaker will look once the gasket is removed.
Clean Gasket	Clean the back of the gasket (if applicable).
Scrape Frame	Scrape all remaining foam and glue from the speaker frame with edge of utility knife.  Use rubbing alcohol to help soften old foam if necessary.
Soften Foam	Soften any old foam on the cone edge using rubbing alcohol or lacquer thinner.
Clean Cone Edge	Remove foam residue on the cone by GENTLY scraping with utility knife while the cone edge is damp with rubbing alcohol.
Ready For Foam	This speaker is now ready for repair.
Apply Glue	Apply 1/8” bead of adhesive to flat lip on cone edge OR to underside lip of foam if cone is angle attach style (as shown here).
Smooth Adhesive	Smooth the adhesive uniformly and immediately apply foam to cone. After applying glue, flip the surround over to attach to the cone if using angle style foam.
Attach to Cone	Work new edge to the cone for several minutes and allow to dry for one hour. It is easiest to install new edge to the TOP of cone regardless of original location. Performance is not affected either way.
Glue To Frame	Insert tip of adhesive bottle under new edge and apply glue around the frame.  Use your fingers to lightly press the topside of the new edge to distribute the adhesive evenly.
Center Cone	Exercise the cone by pressing down evenly around the dust cap.  This will give you a “feel” for the  center of the assembly. Notice how the cone can easily be moved in one direction or the other slightly and the “sweet spot” where there is no scraping of the voice coil is very easy to locate.
Center Cone	Also place fingers above and below cone and exercise up and down as shown. Once everything is centered, press the new edge evenly around frame and allow to dry for one hour.
Glue Gasket	Apply a 1/8” bead of adhesive to top of the center of the new edge on the frame and replace the gasket removed earlier (if applicable). Place the speaker gasket side down to cure for one hour.
Completed Repair	Reinstall speaker into cabinet noting the correct wire hook up to insure proper performance. Also make sure to re-use any seals between speaker and cabinet.

Special Repair Techniques

1. When centering Bose 901 or Bose 802 speaker drivers, it is easy to find the exact center by applying slightly more downward pressure on the side of the cone with the two lead wires attached.

2. You may repair the speakers in the Bose 901 or Bose 802 systems right in the cabinets. There is no need to remove!

3. When cleaning the underside of the masonite trim rings on original Advent and Dahlquist DQ-10, DQ-20 woofers, it is easiest to use the blade of a utility knife to cut away the old foam glue from the underside of the trim ring.  After gluing the new edge to the top of the cone, you can apply adhesive to the TOP of the new edge outer lip and then smooth uniformly. While the adhesive is wet, press the cone assembly all the way down until it stops.  Most of the new edge will pull under the masonite ring. Use the tip of the utility knife to push the rest of the surround edge under the trim ring.  Lift the assembly up and exercise the cone to proceed as shown in step # 8.

4. When working on the Acoustic Research 11” woofer in 12” frame (2 sides of frame are cut off) it is best to apply the adhesive to the underside of the inner lip of the new edge and “form the edge” to the angle of the cone as the adhesive cures.

5. When working with JBL LE-series woofers, make sure to remove the hard black plastic trim ring from the frame and save it for reuse. You can also clean the underside of these cones carefully to install the new edges in the original location IF YOU ARE A SKILLED DO IT YOURSELFER. Otherwise, install the new edges to the TOP of the cones.

6. On Pioneer HPM-series woofers be careful when cleaning the cones as the graphite cones can crack easily.

7.  When repairing Boston Acoustics A-40 with 6-7/8” frame, trim the outer diameter of the new edge to 5-13/16”.

8. If your cone is an odd size such as the 6-3/8” cone Advent 2W, Boston Acoustics HD-7 with 5-3/8” cone, and others, you may trim through the new edge and downsize by resizing to the cone diameter for gluing.  Remove all but 1/4” of the overlap and glue new edge together at the overlap.  Proceed as a normal repair outlined in the repair instructions.

9. If you are using shims for the voice coil, be sure to space them evenly in the magnetic gap. Be cautious when removing the dust caps to prevent damage to the lead wires. Do not remove shims until adhesive has cured for at least one hour.

10. If you purchased foam guard sealant, apply lightly to exposed surface  of surround with a small brush. 

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