HIFIMAN Sundara Headstrap Replacement

This step is necessarily destructive, and with careful application of the cutting pliers, no damage will be done to the headphones. Make sure to remove both fasteners.

The headstrap-headband interface is the piece of plastic which the headstrap itself adheres and whereby it attaches or interfaces with the headband.

Remove the old headstrap from the headband as shown by detaching the headstrap-headband interfaces from the headband.

A metal strip is present inside both of the headstrap-headband interfaces. Make sure to retrieve them and set them aside in a salient location.

Remove the drivers (speakers) as shown.

Insert the new headstrap as shown into the headband by inserting the headstrap-headband interface into the headband, but do not yet press the interface into the headband.

Don't forget to re-insert the metal strips mentioned in Step 2 here as shown in the video.

As the design of the headband is ambipolar, which side is designated as the left or right side does not matter.

Before inserting the drivers back into the headband, make sure to slip on the metal fasteners, one for each driver, onto the extension adjustment.

Make sure the metal fasteners have the written polarity, either L or R, facing on the inside.

After ensuring the fasteners are facing the correct direction, slide the drivers back into the headband and firmly press closed the plastic headstrap-headband interface as shown in the video.

Firmly push the metal fastener upwards to permanently secure the headstrap-headband interface to the headstrap as shown. No adhesive is required.

Make sure to apply equal amounts of force as you push the fastener onto the interface.