Roland MOBILE-BA Battery Powered Stereo Amplifier

The MOBILE BA: Battery-Powered Stereo Amplifier from Roland delivers high-quality stereo sound with flexible connectivity. It features a 15-hour battery life on six AA batteries. It also features reverb/echo effects, vocal cancelation, and an automatic anti-feedback function.
The MOBILE BA has a dedicated 1/4" microphone input, left and right 1/4" line-level inputs, and both RCA and a stereo 1/8" PC/Audio input. Each channel has an independent volume control. The Mic Echo knob mixes reverb/echo effects into the microphone channel. The PC/Audio channel has a push-button for its Center Cancel effect, which nullifies center-panned vocal material, so you can practice singing. The Tone knob acts as a brightness control, adding presence as it's turned clockwise.
The MOBILE AC weighs less than 6 pounds, includes a carrying strap and can be mounted on a mic stand for elevated placement.


-Inputs for mic, stereo Line, and iPod
-Independent volume control per input
-Powered for 15 hours by six AA batteries
-Dual 4" speakers with Center Cancel
-Anti-Feedback function built-in
-Onboard reverb/echo effects
-1/8" headphone output

Tech Specs

Rated Power Output 2.5W + 2.5W
Nominal Input Level PC/Audio: -10 dBu
Mic: -50 dBu
Line: -10 dBu
Speakers 2 x 3.9" (10 cm) speakers
Controls Power
Mic Echo
[PC/Audio] Volume
[Mic] Volume
[Line] Volume
Center Cancel
Power LED Indicator Yes
Headphone Output 1 x 1/8" (3.5 mm) TRS stereo mini
Power Supply 6 x AA alkaline batteries
AC adapter (sold separately)
Current Draw 175 mA (DC 9V)
Battery Life 15 hours
Dimensions (W x D x H) 11 x 4.25 x 7" (280 x 108 x 177 mm)
Weight 5.5 lb (2.5 kg)

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