ES1/EC1 speaker output volume is too low

Tech Note: TN0853
Product: ES1, EC1
Version: All
Date Added: 2009-07-09


ES1/EC1 speakers experience a 30 dB SPL drop across all frequencies resulting in performance below specifications. Over time or with exposure to high temperatures the adhesive holding the copper foil shielding in place can fail. This may result in contact with the grounded bolts of the ES1/EC1 housing causing a short circuit.


To fix this issue:

  1. Power off all equipment and devices and disconnect the ES1/EC1 speaker completely.

  2. Remove the mounting post from the ES1/EC1 using a Phillips-head screwdriver to gain access to the copper foil-wrapped transformer.

  3. Bind the copper foil shielding using one of the suggested methods:

    1. Wrap an orthodontic rubber band around the base of the transformer to hold the foil.

    2. Use an epoxy adhesive or glue to bind the foil.

    3. Wrap electrical or scotch tape around the transformer to cover the foil.

  4. Once complete the foil should no longer be in contact with any of the grounded bolts on the base plate of the ES1/EC1 speaker.

  5. Reattach the mounting post.

The following images can be used for reference.

Here adhesive holding the foil has failed resulting in a short circuit

The rubber band has secured the foil which is no longer in contact with the grounded bolts


If you experience this issue contact TDT to request an RMA.