Mastertunings is downloadable files that can be loaded into each speaker with the use of a USB stick (included). It's very easy and fast to change Mastertunings.

1. Mount the included USB stick into your computer. If you do not have the included USB stick, then any other would do the job (tunings are under 1 mb so all sizes would work).

2. (This step is not needed if you use the included USB stick) Format the USB stick to FAT32 (If you have no idea what this means, and how to do it. Please go to YouTube and type “how to format a USB stick to fat32”) it’s a quick and simple task.

3. Download the Mastertuning file you would like to try, and copy it to the USB stick. Be sure to only have one Mastertuning on the USB stick, if you try others, delete the previous Mastertuning before you copy a new Mastertuning on the USB stick.

4. Turn off the speaker and mount the USB stick in the USB port on the back of the speaker.

5. Turn on the speaker while the USB stick is mounted. You should now see the LEDs on the back do a quick sweep in a circular motion, which indicates that the Mastertuning is correctly installed.

6. You can now remove the USB stick again, and repeat step 5 on the second speaker.

(If the LEDs do the circular sweep slowly, it means that it was not installed. This is most likely because the speakers can’t read the USB stick, check if the USB stick is FAT32). Do the same process for the other speaker. If for some reason you do not get the quick sweep of LEDs, try to press and hold the pairing bottom while you turn on the speakers (with the USB mounted). If this doesn't work, it's because the speakers can't accept your USB stick. Please try another.