The Outlowd ES100 is a two-channel acoustic amplifier rated at 100 W RMS. It is the top model in the Outlowd ES Series and shares its control layout with the smaller ES60, with more power and a higher-grade speaker set-up.

The guitar channel has bass, middle, treble and reverb controls, a sweepable mid frequency, and a Q-factor notch filter for managing feedback. The mic channel has a combi XLR/jack input, switchable +48 V phantom power, a high-pass filter, a full EQ with sweepable mids, and its own reverb. Guitar and vocal reverbs are voiced differently, with hall for the guitar channel and plate for the mic channel.

Sound comes from a 12-inch Celestion neodymium speaker paired with a separate 1-inch HF tweeter, in a cabinet weighing 14.05 kg. For connections there is an effects loop, an aux input, a balanced XLR output with a ground/lift switch, and a master volume, so it can feed a pedalboard or a PA system.