Whether battery powered or plugged in, Roland's BA-330 delivers high-performance sound that defies its size. Its digital stereo amplifier drives four 6.5" stereo speakers and 2 tweeters, positioned for wide stereo projection.If you’ve ever encountered embarrassing feedback onstage, you’ll be pleased to know that the BA-330 is equipped with Roland’s advanced Anti-Feedback technology. With a simple switch, the BA-330 automatically detects the howling point and eliminates feedback!Three high-quality effects are built-into the BA-330: Reverb, Delay, and Wide. The effects can be turned on/off independently for each channel. In addition, a master 2-band EQ is provided as well as EQ control for each channel.The BA-330’s Stereo Link jack lets you cascade 2 units, giving you twice as many channels and the ability to position the 2 units on opposing sides of the stage.A wide range of instruments, microphones, and devices can be plugged into the BA-330 simultaneously. Two mono channels are provided for microphones or line-level instruments (XLR and 1/4" jacks), 2 stereo channels are provided for stereo instruments (1/4" L/R jacks), and a stereo Aux input channel is provided for CD players and other devices (RCA and TRS jacks).The BA-330 is the ideal, all-in-one portable PA solution for small music venues, worship events, conferences, seminars, business meetings, and much more.Roland BA-330 Includes:BA-330 UnitAC CordAC AdaptorOwner’s ManualRoland BA-330 Features:All-in-one portable digital PA system suitable for use anywhereBuilt-in effects: EQ, reverb, delay, and wide (on/off per channel)Four-channel configuration: 2 channels for mic/instruments plus two channels for stereo inputsStereo Aux input with dedicated volume-control knobAdvanced Intelligent Anti-Feedback functionBuilt-in tilt-back stand enables optimal monitoring anglePowerful high-quality stereo sound for audiences of up to 80 peopleNo setup required, just plug in and go!Powered by AC power or 8 AA batteriesFour custom-designed 6.5" speakers and two tweeters for wide stereo projectionSpeaker-stand adaptor for mounting on a standard speaker standRoland BA-330 Specifications:Speakers16 cm (6.5 inches) x 4, Tweeter x 2Input/Output LevelNominal Input Level (1 kHz): CH 1, CH 2 MIC: -50 dBu, CH 1,CH 2 INST: -20 dBu, CH 3/CH 4, CH 5/CH 6: -20 dBu, AUX IN: -10 dBu, STEREO LINK IN: -10 dBuNominal Output Level (1 kHz): LINE OUT: -10 dBu, STEREO LINK OUT: -10 dBuControlsPOWER SwitchChannel Controls: CH1,CH2: MIC/INSTRUMENT Switch, EFFECT Switch, TONE Knob, VOLUME Knob, CH3/CH4, CH5/CH6: EFFECT Switch, TONE Knob, VOLUME KnobMaster Controls: Equalizer (LOW Knob, HIGH Knob), VOLUME Knob, ANTI FEEDBACK Switch, EFFECT Knob, BATTERY CHECK/MUTE Switch, OUTPUT POWER SwitchAUX IN Control: LEVEL KnobIndicatorsBATTERY, BATTERY CHECK/MUTE, POWERConnectorsCH 1, CH 2: Input Jacks (XLR type, 1/4” TRS phone type) CH 3/CH 4, CH 5/CH 6: Input Jack L/MONO (1/4” phone type), Input Jack R (1/4” phone type) AUX IN: Input Jacks (Stereo miniature phone type, RCA phono type) Output: LINE OUT Jack L/MONO (1/4” phone type), LINE OUT Jack R (1/4” phone type) STEREO LINK: STEREO LINK OUT Jacks L/MONO, R (1/4” phone type), STEREO LINK IN Jack (1/4” phone type) FOOT SWITCH: FOOT SWITCH Jack (1/4” phone type) DC IN: DC IN JackPower SupplyPower Supply: DC 12 V; Dry battery LR6 (AA) type (alkaline) x 8, Rechargeable battery HR6 (AA) type (nickel metal hydride) x 8, or AC AdaptorCurrent Draw 410 mAExpected battery life under continuous use: Alkaline: approx. 8 hours (MAX), approx. 12 hours (ECO); Nickel-metal hydride: approx. 10 hours (MAX), approx. 15 hours (ECO)OthersOptions (sold separately): Carrying Bag (CB-BA330), Speaker Stand (ST-A95), Foot Switch: BOSS FS-5L (MUTE), BOSS FS-5U (EFFECT), BOSS FS-6, Connection Cable: PCS-31, PCS-33PhysicalDimensions: 16-3/8" W x 14-1/16" D x 20-1/16 H (415 x 357 x 509mm)Weight: 30 lbs, 7 oz (13.8 kg) Roland BA-330 Portable Stereo Sound System.