Contents:

X-mini MAX v1.1

Teardown

LED indicators too bright

Research

Less light ⇒ more music

Right speaker before

Left speaker after

Right speaker after

X-mini MAX v1.1

X-mini MAX v1.1 are nice small speakers. I like them while travelling (together with the Bluetooth Audio Adapter).

Teardown

Opening the speakers was really easy: Unscrew four screws near the bellows, and then break two drops of paint probably preventing PCB vibration. You need to re-apply paint during the assembly.

opened speaker teardown

It is interesting that left and right speakers use different PCB design. One is an approximate mirror of the another.

PCB of the left speaker PCB of the right speaker

LED indicators too bright

I wanted to use it for playing of music for sleeping. But the indication LED produces too much light. Much more than my night light keyring. I can hardly asleep near such strong light. So I decided to dimm the indicators.

Research

Looking It was easy to find the common resistor limiting the LED power current: It is the 330Ω resistor marked R13 in the left speaker and R27 in the right speaker.

Less light ⇒ more music

330Ω means current about 10mA. Modern highly efficient LEDs produce too much light at that current. After some experimenting, I decided to use 20kΩ, which is barely visible in daylight and does not glare in the night.

Right speaker before

R27 has 330Ω

right speaker before mod

Left speaker after

R13 was replaced by 20kΩ SMD resistor (0603)

left speaker after mod

Right speaker after

R27 was replaced by 20kΩ SMD resistor (0603)

right speaker after mod