Bowers & Wilkins Speaker Foam & Rubber Repair Guide: CM2, CM4, CW0086 & More

Bowers & Wilkins (B&W) built its reputation on engineering pedigree, and that reputation is well earned — models like the CM2, CM4 and the CW0086 driver used across several ranges are prized for their accuracy and detail. But the rubber and foam surrounds on these drivers don't last forever. Once they split, crack or perish, even a well-cared-for pair of B&W speakers will sound thin, distorted or rattly. The good news is that re-edging a B&W driver is a straightforward home repair.

Signs Your B&W Surround Needs Replacing

Look closely at the ring connecting the cone edge to the driver basket. Rubber surrounds typically crack or split with visible tears, while foam surrounds crumble, flake or develop holes. You may also notice reduced bass output, buzzing at low volumes, or a cone that sits visibly off-centre or moves unevenly when pressed gently.

Which B&W Repair Kit Do You Need?

B&W used both rubber and foam surrounds across different eras and ranges, so check which material your original driver used as well as the outer and inner diameter before ordering:

Each kit includes a matched pair of surrounds, T7000 adhesive, an applicator brush and instructions. We also stock a genuine-style B&W badge for grilles that have lost theirs.

Step-by-Step: B&W Surround Replacement

Tools Required

  • B&W foam or rubber repair kit
  • Isopropyl alcohol (90% or higher)
  • Cotton swabs or lint-free cloth
  • Phillips or flat-head screwdriver

1. Access the Driver

Remove the grille and unscrew the driver from the baffle. Disconnect the wiring terminals, noting which wire connects to positive before you disconnect.

2. Remove the Old Surround

Peel or scrape away all remnants of the old surround from both the cone edge and the basket rim. Clean both surfaces thoroughly with isopropyl alcohol and allow to dry completely — any residue left behind will stop the new surround bonding properly.

3. Bond the Outer Edge

Apply a thin, continuous bead of T7000 to the basket rim, then position the new surround's outer edge into the adhesive. You have roughly 5–10 minutes of working time to check it sits flush and even all the way round.

4. Centre the Voice Coil and Bond the Inner Edge

Apply T7000 to the inner edge of the surround. Gently depress the cone with two fingers and release it — it should return to centre with no rubbing or scraping. Once centred, press the inner edge down onto the cone firmly.

5. Leave to Cure for 24 Hours

Allow the adhesive a full 24 hours at room temperature to reach maximum strength before reinstalling the driver and testing at low volume.

Shop B&W Repair Kits

All kits are UK-stocked with same-day dispatch on orders before 4pm and free UK delivery via Royal Mail 1st Class. Browse the full Bowers & Wilkins repair kit range, or get in touch if you're unsure which kit matches your model.

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Instructions

Instructions

Required Equipment

  • New speaker surrounds
  • Screwdriver (for speaker removal)
  • Utility knife
  • Rubbing alcohol or lacquer thinner
  • Speaker repair glue
  • Wood chisel (optional, for stubborn residue)

Step-by-Step Instructions

Phase 1: Disassembly & Cleaning

  1. Remove the Speaker: Unscrew the speaker driver from the cabinet and disconnect the wires.
  2. Detach the Gasket: If your speaker has a gasket, use a utility knife to carefully slice through the glue separating it from the frame and old surround. Save the gasket for reinstallation later.
  3. Clean the Surfaces: Dab rubbing alcohol onto the old foam/rubber residue on the frame, gasket, and cone. Let it soak in to soften the glue, then carefully scrape it clean using your utility knife or chisel. The surfaces must be completely clean and dry before proceeding.

Phase 2: Fitting & Gluing the Inner Edge

  1. Dry Fit the New Surround: Place the new surround onto the cone and frame to check the fit. If the outer lip is slightly too large, carefully trim the outer edge with your utility knife.
  2. Glue Surround to Cone: * If the cone has a flat lip, apply glue in a continuous wave pattern directly to that lip.If the cone is angled, apply the wave pattern of glue to the underside of the inner surround lip.Apply the surround to the cone immediately after gluing.
  3. Secure the Inner Bond: Gently rub and work the inner edge of the surround against the cone for a few minutes to ensure the glue spreads evenly and begins to tack. Allow it to dry for 1 hour.

Phase 3: Gluing the Outer Edge & Reassembly

  1. Glue Surround to Frame: Lift the outer edge of the surround and apply a generous layer of glue directly onto the speaker frame underneath. Press the surround down, working it with your fingers to ensure a good bond. Allow it to dry for 1 hour.
  2. Reattach the Gasket: If you removed a gasket in Step 2, apply a layer of glue to the top outer diameter of the new surround. Press the gasket firmly back into place. Allow it to dry for 1 hour.
  3. Reinstall the Speaker: Reconnect the speaker wires and screw the speaker driver back into its cabinet.

Pro-Tips for Success

  • Take Your Time Scaping: The bond of your new surround is only as good as the cleanup job. Don't rush the removal of the old glue.
  • The Wave Pattern: Gluing in a tight "S" or wave pattern ensures full surface coverage without creating a massive, runny mess when pressed down.
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