BA-55

Battery-Powered Portable Amplifier

BA-55
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Versatile, Portable PA with a Twist

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.

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.

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.

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).

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
Speakers
16 cm (6.5 inches) x 2
Wireless Reception Method
Roland Original (for DR-WM55 only)
Controls
Controls
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
Indicator
PANEL
WIRELESS 1, WIRELESS 2, ANTI-FEEDBACK, STEREO, POWER
FRONT
WIRELESS 1, WIRELESS 2, POWER
Connectors
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)
OUTPUT
LINE OUT jacks (RCA phono type)
DC IN
DC IN jack
Power Supply
DC 12 V
Alkaline 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.
Other
Accessories
Wireless MIC (DR-WM55) x 1
Power Cord
AC Adaptor
Owner's Manual
Options (sold separately)
Wireless MIC (DR-WM55)
Speaker Stand (ST-A95)
Size and Weight
Width
355 mm
14 inches
Depth
265 mm
10-7/16 inches
Height
481 mm
18-15/16 inches
Weight
10.2 kg
22 lbs. 8 oz.
*0 dBu = 0.775 Vrms
In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.

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Support

If you have questions about operating your Roland product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.

Owner's Manuals