For added highs.
The tiny Markbass Tweeter Box External Tweeter can be easily transported from practice space to practice space. If you own a Micromark practice amp and feel you're missing out some of the higher frequencies, this little external Tweeter Box will solve your problem. Weighs less than half a pound. Just plug the Markbass Tweeter Box into your Micromark, use the velcro-padded bottom to help secure it and start rediscovering your high-end response. The tweeter itself is a Piezo that produces 20W RMS (AES Standard) power of sound.
NOTE: To maximize the volume produced by your Micromark, place the combo on the floor for the fullest low end, and angle the tweeter toward ear-level so you can hear the more directional high frequencies.