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TOA Electronics A-903MK2 manual

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Table of contents for the manual

  • Page 1

    TOA 90 0 SERIES II MIXER POWER AMPLIFIER Operating Instructions A-903MK2 A-906MK2 A-912MK2 TO REDUCE THE RISK O F ELECTRICAL SHOCK, D O N OT REMOVE COVER. N O U S ER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. THE LIGHTNING FLASH WI TH ARROWHEAD W ITHIN A TRIANGLE I S INTENDED T O TEL L THE US ER TH A T PARTS INSI DE T[...]

  • Page 2

    Contents General description Features Nomenclature Fr ont panel Rear panel Input connections Output c onnections (A-903MK2) Output connections (A-906MK2/A-912MK2) Muting and remote volume control connection Rac k mounting Operation Volume adjustment To ne control adjustment Installation Servicing Specifications Appearance (A-903MK2) Appearance (A-9[...]

  • Page 3

    General Description The T OA A-903MK2, A-906MK2 a nd A-912MK2 Mixer Power Amplifiers control and m i x u p to eight independent input signals. T h e A-903MK2 delivers u p to 3 0 watts of output power, the A-906MK2 6 0 watts and A-912MK2 1 2 0 w atts. Optional plug-in modules a re avai lab le f o r use wit h these m ixer power a mp lifiers to provid[...]

  • Page 4

    Nomenclature Front Panel Power Switch Applies line power. T wo-position push button switch f or on /of f modes. Power Indicator L E D Green L ED lights whe n th e power i s switched "ON". Signal Indicator LE D Green LED lights when more than –30 dB signal level is fe d to t he inputs b y means of the input a n d m as te r volume control[...]

  • Page 5

    Rear Panel AC Power Cord Connects to power source. A C Outlet (Unswitched) Prov ides A C power f o r auxiliary equipment with power consumption of up to 500W. Output terminals Connect to speakers. Impedance Select Sw itch Selects the desired impedance. Enables unbalanced output of low impedance wh en th is switch is set to "DIRECT". Modul[...]

  • Page 6

    Input Connections There are eight INPUT PORTS f o r PLUG-IN MODULES. Se lec t the desired modules for each application. Plu g the modules in to t h e INPUT PORTS. Slide th em between the guide rail s and s ecure w it h t wo screws. CAUTION : Modules s hould no t be inserted or removed while the amplifier i s turned on. Cover unoccupied INPUT PORTS [...]

  • Page 7

    T o connect speakers to 8-ohm output (UNBALANCED DIRECT OUTPUT) (A-903MK2) 8-ohm Loosen the screw. Place the impedance switch in 8-ohm p o s ition. Tighten th e s c re w. Output Connection (A-906MK2/A-912MK2) The speaker outputs of the amplifier are 4 ohm s, 8 ohm s, 25V an d 70V. Connect speakers to an y one of these outputs. Class 2 wiring ma y b[...]

  • Page 8

    T o connect speakers to 4-ohm output (UNBALANCED DIRECT OUTPUT) (A-906MK2/A-912MK2) 4-ohm Loosen the s crew. P la c e th e impedance switch i n 4-ohm po s ition. After a ll connections ar e made, tighten the s crew. Muting and Re mo t e Volume Control Connection MUTE 2 MUTE 1 POTENTIOMETER 10k OHM S Remote volume control connection limiting front p[...]

  • Page 9

    Operation After a ll connections ar e made, t u r n power switch O N, illuminating the Power Indicator L ED . The amplifier comes int o operation approximately 5 seconds after the power is turned on . Volume Adjustment Obtain de sir ed output lev el b y adjusting the individual input an d ma st er volume co n tr ol s . For normal mu sic playing o r[...]

  • Page 10

    Specifications Type Output Power Power Ba nd Width Frequency Res ponse Total Hamonic Distortion Inputs Input S en s itivity/Impedance Preamp OUT/Power Amp I N Outputs (T)=Transformer (D)=Direct Output R egulation ( 1 kH z) Signal to Noi se Ratio (Band Pass 20 ~20,000 Hz ) Tone Defeat SW ON To ne Controls Controls Indicators Protection Connectors Po[...]

  • Page 11

    Appearance (A-903MK2) Front View Rear View Top Vi e w Side View 420 280 318 17 –11–[...]

  • Page 12

    Appearance (A-906MK2/A-912MK2) Front View 420 Re ar View Top Vie w Side V ie w 88.4 99.1 320 358 17 TO A Corporation KOBE, JAPAN PRINTED IN TAIWAN 133-12-114-60[...]