Rane MA 4 MA 4 Amplifier Data Sheet - Page 3

MA 4 MULTICHANNEL AMPLIFIER MADE IN U.S.A. RANE CORP. MA 4 COMMERCIAL AUDIO EQUIPMENT 24TJ R 100-240V 50/60 Hz 500 WATTS FOR CONTINUED GROUNDING PFROORTCEOCNTITOINNUDEODNGORTORUENMDOINVGE TPHRIOSTSECRTIEOWN. DO NOT REMOVE THIS SCREW. INT EXT 4 OUTPUTS Class 2 Wiring INT EXT INT EXT 3 2 INT EXT 1 LOAD LOAD LOAD LOAD FAULT FLAG Active Low 4321 4321 MODE HIGH-PASS 20Hz 40Hz 60Hz 80Hz MASTER COMP SLAVE ON ON ON 1234 1234 1 2 3 4 EXP ON 4 Vr Vc REMOTE LEVEL 3 2 1 Use Rane VR 2 or 20 kΩ pot Vr Vc Vr Vc Vr Vc Vr Vc Vr Vc Vr Vc Vr Vc 1 0q 98765 4 INPUTS 4 SENSITIVITY 13 +- 3 SENSITIVITY 13 +- 2 SENSITIVITY 13 +- 1 SENSITIVITY 13 +- +- 22 4 dBu +- 22 4 dBu +- 22 4 dBu +- 22 4 dBu 23 1 Universal voltage, power-factor corrected, switch mode power supply operates 85 to 260 VAC, 50 Hz or 60 Hz. The supply features under and over voltage protection, low inrush current and operates with up to 85% efficiency. 2 INPUTS are balanced and accept up to +22 dBu via Euroblock connectors with strain-relief. 3 SENSITIVITY controls allow continuous adjustment from +22 dBu to +4 dBu. Integrated limiter prevents clipping regardless of input level and sensitivity setting. 4 REMOTE DC LEVEL control ports with Euroblock strain-relief connectors allow audio taper attenuation using optional VR 2 remote (or use 10k to 100k Ω linear pot). Clickless muting may be implemented using a switch, connecting Vr to Vc. 5 A soft knee COMPressor is provided with rms threshold relative to the limit threshold. ON/off setting affects all channels. This allows uncompressed operation with typical program material while reducing continuous sine-wave power. Ratio is 3:1; Attack is 1.5 seconds; Decay is 3 dB per second; Soft knee span is 10 dB. 6 Downward EXPander reduces noise in the absence of signal. ON/off setting effects all channels. º RMS Threshold: -70 dBFS; Ratio: 3:1; Attack: 50 ms; Gain reduction: 10dB/sec. 7 Selectable 20 Hz, 40 Hz, 60 Hz or 80 Hz HIGH-PASS filters are provided. The setting affects all channels. Filters are 12 dB per octave, Butterworth alignment. 8 Each channel is set for MASTER or SLAVE operation. Master channels write Fault Flag status. Slave channels read Fault Flag status. • The Master setting is used for remote fault reporting and/or automatic redundancy switching control. • The Slave setting is used for individual channel remote power sequencing or automatic redundancy switching. 9 Individual FAULT FLAG ports are provided for each channel. • The Fault Flag uses high-side active drive and passive pull down. No fault = +5 volts. Fault = 0 volts. • Channels set to Master drive the Fault Flag high when no fault is present. Passive pull down pulls the Fault Flag low when a fault occurs or power is lost. • Slave channels read the status of the Fault Flag. 0 Amplifier outputs are floating (not ground referenced) and are not bridgeable. Each channel delivers 100 watts into a 4 or 8Ω load. Average load impedance is estimated then used to determine the limiter threshold required to limit maximum power to 100 watts and peak current to less than 7.5 amps. Impedance estimation requires a minimum of 3.3 watts and is averaged over 180 ms. q External amplifier input is used for Internal, automatic redundancy switching. w Comprehensive front panel metering is included for each channel: • Four segment, load sensitive headroom meter shows remaining headroom. • Limiter, Compressor and Expander indicators light when the associated dynamics control is active. • The Fault indicator lights when a fault is detected • The Load indicator if off when impedance is above 16Ω, on when impedance is between 2 and 16Ω and flashing when the impedance is below 2Ω. • The Ready indicator is off when the power switch is off, flashing when the power is switch is ON and the unit is in standby (Slave channel with high fault flag) and on when the channel is active. 1 3 Limit 6 Comp 12 Exp 24 dB Headroom 2 Fault Load Ready 3 Limit 6 Comp 12 Exp 24 dB Headroom 3 Fault Load Ready 3 Limit 6 Comp 12 Exp 24 dB Headroom 4 Fault Load Ready 3 Limit 6 Comp 12 Exp 24 dB Headroom Fault Load Ready w ON Data Sheet-3