The unique BA-55 provides self-contained, high-quality, and battery-powered sound reinforcement for any environment. It’s solidly built yet lightweight, and comes bundled with a matching wireless microphone for public speaking, singing, and many other events. Use the BA-55 as a small wireless PA system in school classrooms, business meetings, restaurants, weddings, intimate music venues, and more. In a cool and convenient twist, the BA-55 contains an internal accelerometer sensor that automatically switches operation between stereo output (when positioned horizontally) and mono output (when positioned vertically). If you’re speaking and need maximum power and projection, use the vertical mono mode. For wide musical spread, turn horizontal. It’s that easy! The BA-55 is available in two color choices, black (BA-55) or white (BA-55-WH). Choose one of these classic colors to blend best with your surroundings.



  • Portable design with high-quality sound for audiences up to 80 people
  • SPL (sound pressure level) rated at a powerful 108 dB
  • One 2.4 GHz wireless microphone included (DR-WM55); a second DR-WM55 can be purchased separately for simultaneous use
  • Operates on 8 AA batteries or AC power (AC adaptor included)
  • Onboard accelerometer sensor switches operation to stereo mode when positioned horizontally
  • Two 6.5″ (16 cm) high-performance speakers
  • Three-channel built-in mixer with two-band EQ
  • Echo/Reverb effect
  • Built-in Anti-Feedback function
  • Line Output for recording or expanding the system
  • Integrated storage compartment for storing wireless microphones and accessories
  • Auto Power Off function
  • Compatible with Roland ST-A95 speaker stand

Easy to Use and Transport

With the BA-55, ease of use is the name of the game. There’s nothing complicated about it: just turn on the wireless microphone and/or plug in your instruments, set the volume to the desired level, and go. That’s it! The BA-55’s automatic anti-feedback system blocks acoustic feedback without interrupting your audio. For easy transport, the BA-55 has a convenient built-in storage compartment to house your wireless microphones and accessories.

Built-In Echo/Reverb

Onboard the BA-55 is an Echo/Reverb that sounds great and is easy to use, with a single knob that adjusts both the effect type and amount. When you turn the knob from the Off position to 12 o’clock, you activate a natural plate-reverb-type effect that adds a natural ambience to your voice and/or instruments. When you turn from the 12 o’clock position to maximum, you switch to a repetitive echo-type effect. The echo/ reverb can also be turned on and off from the included DR-WM55 wireless microphone for convenient remote control (see below).

Multi-Purpose PA

The BA-55 lets you enjoy great sound anywhere, indoors or outdoors. Use batteries or the included AC adapter for the ultimate in convenience and flexibility— For speech, position the BA-55 vertically and the internal accelerometer will automatically switch operation to mono mode for maximum sound projection. For music, place the BA-55 horizontally and it will automatically switch to stereo mode; this is perfect when using MP3/CD players at dance parties, etc., or any application where wide sound projection is desired.

Wireless Microphone Included

The BA-55 package includes a high-quality wireless microphone (DR-WM55). Designed specifically for this system, the mic has Power On/Off and Echo On/Off switches. The Echo switch is linked to the BA-55’s Echo/Reverb effect, which lets you enable and disable it directly from the mic. This is a very handy feature, allowing the effect to be quickly turned off when speaking or making announcements, then easily switched back on for singing.


            Rated Power Output

            20 W (10 W + 10 W)
            SPL 108 dB

            Nominal Input Level (1 kHz)

            MIC (XLR type)-50 dBu
            AUDIO/INST (RCA phono type)-10 dBu
            AUDIO/INST (Stereo miniature phone type, 1/4-inch phone type)-20 dBu

            Nominal Output Level (1 kHz)

            LINE OUT – 10 dBu


            16 cm (6.5 inches) x 2

            Wireless Reception Method

            Roland Original (for DR-WM55 only)


            POWER Switch, CHIME Button, CHIME VOLUME Knob, ECHO Knob, AUTO POWER OFF Switch

            Channel Controls

            Wireless 1, Wireless 2: VOLUME Knob
            AUDIO/INST: VOLUME Knob

            Master Controls

            Equalizer: HIGH Knob, LOW Knob




            MIC Input jacks (XLR type, 1/4-inch TRS phone type)
            LINE AUDIO Input jacks (Stereo miniature phone type, RCA phono type)
            INST Input jack L/MONO (1/4-inch phone type)
            INST Input jack R (1/4-inch phone type)OUTPUTLINE OUT jacks (RCA phono type)
            DC IN DC IN jack

            Power Supply

            DC 12
            VAlkaline battery (AA, LR6) x 8
            Rechargeable Ni-MH battery (AA, HR6) x 8
            AC Adaptor

            Current Draw

            430 mA

            Expected battery life under continuous use

            Alkaline battery (AA, LR6): about 6 hours
            Rechargeable Ni-MH battery (AA, HR6): about 6 hours
            * These figures will vary depending on the actual conditions of use.


            Wireless MIC (DR-WM55) x 1
            Power Cord
            AC Adaptor
            Owner’s Manual

            Options (sold separately)

            Wireless MIC (DR-WM55)
            Speaker Stand (ST-A95)



            355 mm
            14 inches


            265 mm
            10-7/16 inches


            481 mm
            18-15/16 inches


            10.2 kg
            22 lbs. 8 oz.

            PERFECT SOUND

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