User manual ROLLS MA251

[. . . ] WARNING: THE MINIMUM SPEAKER IMPEDANCE IS 4 OHMS EACH. IF YOU CONNECT AND USE THE MA251 WITH A LOWER SPEAKER IMPEDANCE THAN LISTED ABOVE YOU WILL DAMAGE THE UNIT AND POSSIBLY OTHER EQUIPMENT THAT IS CONNECTED TO THE MA251. MA251 5 + 5 watt Mixer/Amplifier MADE IN USA www. rolls. com MA251 0 10 0 10 0 10 0 10 SPECIFICATIONS: Line Input Impedance: Power Output: Voltage Gain: Maximum Supply Voltage: THD: EIN: Efficiency: Input Sensitivity: Bandwidth: +Size: Weight: 10K Ohms Line 600 Ohms Mic. [. . . ] NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWLEDGE OF AUDIO ELECTRONICS, BALANCED AND UNBALANCED CONNECTIONS, AND PROPER SIGNAL LEVEL SETTING. If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future. Please visit our web site at www. rolls. com and click on the Register Your Warranty Here button. CHANNEL DESCRIPTION CH 1 INPUT: XLR jack for connection to a microphone. CH 2 INPUTS: Stereo RCA and one mono RCA for connection to a signal source such as a CD player, cassette deck, tuner, etc. . PLEASE NOTE WITH A MONO INPUT AS WELL AS A STEREO INPUT, CHANNEL 2 AT CERTAIN IMPEDANCES ON THE STEREO INPUT YOU MAY EXPERIENCE CROSS TALK BETWEEN THE LEFT AND RIGHT. CH 3 INPUT: Stereo RCA jack for connection to a signal source such as a CD player, cassette deck, tuner, etc. LINE OUT: Stereo RCA jacks for connection to a mixer or amplification device. CONNECTION / OPERATION To operate the MA251, properly connect cords from the sources to be mixed (mics, cassette decks, CD players etc. ) into the channel inputs. [. . . ] 3. 5mm JACK: For connection to an ipod, MP3 player or computer TRS Stereo (left, right and ground) connection to channel 4 120PF R13 100 4560 C33 503 R22 18K R23 22K D1 FRONT PANEL 1 C6 47U R24 C15 10U 2 5 4 1 1K 47U C10 +B 4560 R12 100K R31 V+ U3A C4 100K 4560 C8 100 VCC LDRR 7 R21 4. 7K 1 3 6 OFF - ON PHANTOM POWER CH 1 INPUT CH 2 INPUT CH 3 INPUT LINE OUT RIGHT LEFT 1U 1U C5 C9 47U C14 MUTE R16 1K + + J3A RCAX4 - - J3D RCAX4 J3C RCAX4 J3B RCAX4 VCC Q3 2N3904 R26 10K Size: Title 3 8 Document Number: Rev: MA251. SCH A Rb Date: 21 October 2009 Sheet 1 of 1 C19 . 68uF C22 . 68uF MA251 CLASS MIXER AMPLIFIER 1 2 3 4 Rolls Corporation VCC C26 C27 . 1uF . 1uF VCC VCC C25 . 1uF 5968 S 350 W Murray Utah 84107 C20 1K R27 4. 7K R28 4. 7K C23 1K +--+ SPEAKER OUT J6 DESCRIPTION REAR PANEL PS12 MA251 CLASS AMP + BOTH + 5 WATT LEFT OUTPUTS MIX/AMP - MUST - RIGHT CH 4 3. 5mm STEREO BE USED + CH 4 LEVEL MONO INPUT MUTE CH 2 LINE OUT R L CH 3 LEVEL CH 3 INPUT L R CH 2 INPUT R CH 2 LEVEL L CH 1 INPUT CH 1 LEVEL ON - OFF PHANTOM POWER [. . . ]