User manual MARTIN AUDIO EFFECT3R SCHEMATICS

[. . . ] Refer servicing to qualified personnel only. 3. 4 Important Safety Instructions Before using your amplifier, please read the operating instructions and the safety suggestions. Do not operate the amplifier if liquid ingress is suspected. Do not stand water or any other liquid on, or near the amplifier. Do not operate the amplifier if wet or standing in liquid. [. . . ] You can use the remaining input connector to carry a parallel signal to other amps. Both A and B level attenuators must be at the same position. We recommend they are used in the 0dB fully clockwise position. The loudspeaker should now be connected to Channel A output Speakon. (+1 should be connected to the [+] positive terminal of the loudspeaker, and -2 to the [-] negative terminal of the loudspeaker. 5. 3. 5 Bridge mono mode features Bridged mono mode combines the power of two output channels into one. This results in twice the voltage swing, four times the peak power and just less than three times the full power of a single channel. This is because the coil is driven with positive voltage at one pole and an equivalent negative voltage at the other pole. So, if an 8 ohms load is connected in bridged mode, one channel shares one 4 ohms part of the load, and the other channel shares the other 4 ohms part. The power into 4 ohms from an MA 900 is 700W. So, the total bridged power into the 8 ohms load will be 2 x 700 = 1400W All material © 2007. Subject to change without notice. 7 Martin Audio ­ EFFECT3R Amplifier CONTENTS < > PRINT GUIDES ENGLISH 6 6. 1 INSTALLATION Mounting The amplifier is two rack unit's high (2U) and weighs 15Kg (33lbs) and will mount in a standard EIA 19" rack. If however you wish to permanently connect the signal ground to chassis earth, connect the XLR-connector's shell lug to pin 1. In the interest of safety never disconnect the earth pin on the mains cable. To comply with CE approval (radio interference), there is an AC mains filter. This filter needs the chassis earth for reference, otherwise a current loop is formed via the signal ground. Never disconnect (lift) the mains safety earth. 6. 5 Power consumption There are three ways to determine the power/current consumption of the amplifier: First, the peak current draw at full power output. Under this condition the amplifier will operate for less than 2 minutes before thermally limiting or blowing the mains fuse. Second, the maximum expected average current under worst case program material, which is 1/3 of full power according to the FTC-standard. At this level the music will be in the state of constant clip and is therefore the highest power level one can obtain without completely obliterating the program material. Lastly, the "normal operating power", as defined by EN 60065 as a measurement level for approval and testing to this standard. The normal operating power is measured using pink noise, with an average output power equal to 1/8 of full power. The one-eighth power is the maximum volume music can be re- played without continuous amplifier clipping this corresponds to headroom of only 9dB's, which is very low for normal program material. MAX OUTPUT POWER EFFECT3R 8 ohms 4 ohms 2 ohms 2x 2x 2x Power [W] 200 320 470 MAINS INPUT POWER 1/3 Power note 1 345 570 930 1/8 Power note 2 235 370 585 Idle 60 60 60 note 1 note 2 Average power with music as program source. [. . . ] Check also that the VHF protection is not activated. If it is, remove the cause of the possible high frequency oscillations from the relevant input. Fault: The amplifier goes into thermal protection when driven at low level. Check that there is no short circuit present at the amplifier's output, e. g. [. . . ]