OPERATORS MANUAL MA 4 MULTICHANNEL AMPLIFIER 1 3 6 12 24 Limit Comp Exp Fault Load Ready 3 6 12 24 2 Limit Comp Exp Fault Load Ready 3 6 12 24 3 Limit Comp Exp Fault Load Ready 3 6 12 24 4 Limit Comp Exp Fault Load Ready ON MA 4 DIGITAL AMPLIFIER dB Headroom dB Headroom dB Headroom dB Headroom Quick Start Basic MA 4 operation is straightforward: 1. The universal switching power supply works with 100 to 240 VAC, 50/60 Hz. 2. Make sure the front panel power switch is off (the unit consumes 5 watts in standby mode). 3. Connect balanced inputs (rear panel). 4. Set SENSITIVITY controls to +22 (see why on page Manual-2) (rear panel). 5. Turn the Downward EXPander ON (rear panel). 6. Set COMPressor to 10 dB (rear panel). 7. Select the appropriate HIGH PASS filter frequency (20, 40, 60 or 80 Hz on rear panel). 8. Connect speaker loads (rear panel). 9. Make sure you have adequate ventilation around the unit ­ see Safety Instructions. 10. Turn ON the front panel power switch. You're good to go! Metering shows the status of the amplifier at a glance (see page Manual-3). Headroom (with any load), dynamics control, Fault status and Load status are indicated for each channel. Extra Credit For remote turn-on, fault reporting and back-up amplifier operations, and remote level control wiring, see page Manual-4. For FAULT FLAG operation (applications and reported faults), see page Manual-3. MADE IN U.S.A. RANE CORP. MA 4 For continued grounding protection do not remove screw ACN 001 345 482 COMMERCIAL AUDIO EQUIPMENT 24TJ 4 + INT EXT 3 + Class 2 Wiring INT EXT INT EXT OUTPUTS 2 + 1 + INT EXT LOAD ­ + ­ LOAD ­ + ­ LOAD ­ + ­ LOAD ­ + ­ FAULT FLAG Active Low 4321 HIGH-PASS 20Hz 40Hz 60Hz 80Hz MASTER COMP SLAVE ON ON ON MODE INPUTS 4 Vr Vc REMOTE LEVEL 3 2 Use Rane VR 2 or 20 k pot Vr Vc Vr Vc 1 Vr Vc 4 SENSITIVITY 3 SENSITIVITY 13 2 SENSITIVITY 13 1 SENSITIVITY 13 +­ +­ 4 +­ 4 +­ 4 13 100-240V 50/60 Hz 500 WATTS C R US + ­ + ­ + ­ + ­ + ­ + ­ + ­ + ­ 4 3 2 1 22 1 2 3 4 1 2 3 4 22 22 22 4 dBu Vr Vc Vr Vc Vr Vc Vr Vc dBu dBu dBu LISTED 1 2 3 4 EXP ON +­ +­ +­ +­ + ­ + ­ + ­ + ­ SOURCE 1 SOURCE 2 SOURCE 3 SOURCE 4 Installation · · · · No rear mounting hardware required. Allow adequate ventilation to keep ambient temperature around the amplifier below 104°F (40°C). Fan cooled with inset intake on left side and inset exhaust on right side (no filter) Amplifier heat load in Btu/hr at 100/240 VAC º 10.2 / 13.3 Btu/hr All amplifiers in standby º 112.3 / 95.5 Btu/hr All amplifiers on, no signal º 167 / 139 Btu/hr All amplifiers driven, pink noise, 12 watts avg. 4:1 crest º Note: 1 watt x 3.413 = 1 Btu/hr. WEAR PARTS: This product contains no wear parts. Manual- Description & Operation · Each channel delivers 100 watts of power into a 4 or 8 load (constant power). º Average load impedance is estimated, then used to set the limiter to confine the maximum average power to 100 watts. · Universal voltage, power-factor-corrected power supply (see figure on data sheet). º Switch-mode power supply operates 100 to 240 VAC, 50 Hz or 60 Hz. º Under- and over-voltage protection with inrush current management. º The power supply features an IEC appliance inlet. º Must be connected to a grounded mains socket-outlet. · Class D amplifiers operate at up to 85% efficiency. º Amplifiers operate in floating Bridged configuration. º Channels are not bridgeable. º Balanced Inputs accept +22 dBu maximum. MADE IN U.S.A. RANE CORP. MA 4 For continued grounding protection do not remove screw ACN 001 345 482 COMMERCIAL AUDIO EQUIPMENT 24TJ 4 + INT EXT LOAD ­ + ­ 100-240V 50/60 Hz 500 WATTS C R US + ­ + ­ LISTED · Rear panel SENSITIVITY controls allow continuous adjustment from +22 dBu to +4 dBu. º Integrated Limiter prevents clipping regardless of input level and sensitivity setting with input levels up to +22 dBu. º The best dynamic range is achieved when all stages in a system clip at the same time. If the signal processing in front of the amplifier clips at +22 dBu, and the amplifier sensitivity is set so that it clips at + 4 dBu, you loose 18 dB of headroom. HIGH-PASS 20Hz 40Hz 60Hz 80Hz MASTER COMP SLAVE ON ON ON MODE INPUTS 4 Vr Vc FAULT FLAG Active Low 321 REMOTE LEVEL 3 2 Use Rane VR 2 or 20 k pot Vr Vc Vr Vc 1 Vr Vc 4 SENSITIVITY 3 SENSITIVITY 13 2 SENSITIVITY 13 1 SENSITIVITY 13 +­ +­ 4 +­ 4 +­ 4 13 22 1 2 3 4 1 2 3 4 22 22 22 4 dBu Vr Vc Vr Vc Vr Vc Vr Vc dBu dBu dBu 3 2 1 1 2 3 4 EXP ON +­ +­ +­ +­ · REMOTE DC LEVEL control inputs are provided for each channel. º Audio taper attenuation with external linear pot (0 dB to ­80 dB, ­16 dB at center position). º Clickless mute with switch (use SPST switch; connect Vc to GND to mute). º Euroblock connector with strain relief (Vref, Vcontrol, GND). º One pot may control all four channels by daisy-chaining the Vc of the used port to the other three ports. · The Load-dependent Limiter eliminates voltage and current clipping, ensuring signal integrity and uninterrupted service. º The peak signal detector for the Limiter is oversampled to insure accuracy at any frequency. º Instantaneous attack and 3 dB per second decay. · Average load impedance is estimated and used to determine the Limiter threshold setting. º The front panel Load indicator (see metering) indicates the load status. º The normal impedance range is 2 to 16 . (green Load indicator on). º Average load impedance is estimated over 180 ms and requires a minimum of 3.3 watts averaged over 180 ms. · A soft-knee COMPressor is enabled (down) or disabled (up) for all channels using the rear panel dipswitch. º The rms threshold is 10 dB below the Limiter threshold. · Allows full uncompressed operation of typical program material while reducing continuous sine wave power. · Soft knee span is 10 dB; Ratio is 3:1; Attack is 1.5 seconds; Decay is 3 dB per second. º If the internal amplifier temperature goes above 65° C, the compressor is automatically set to the 10 dB setting until the temperature drops below 55° C. At normal operating temperatures, the threshold setting follows the dipswitch setting. MADE IN U.S.A. RANE CORP. · Downward EXPander reduces noise in the absence of signal. OUTPUTS MA 4 Class 2 Wiring º The expander is enabled ACN 001 345or disabled (up) for all channels using the rear panel dipswitch. (down) 482 INT EXT INT EXT INT EXT INT EXT FAULT 4 3 ms; Gain reduction 10 dB per second. 2 1 º Threshold is ­70 dBFS; Ratio is 3:1; Attack time is 50 FLAG COMMERCIAL For continued · 20, 40, 60 or 80 Hz HIGH-PASS filters are selected using the rear panel dipswitch. º Setting affects all channels. C US 100-240V º Filters are 12 dB per octave, Butterworth alignment. ­ + ­ + ­ + ­ + ­ + ­ +­+­ + LISTED R grounding protection do not remove screw AUDIO EQUIPMENT 24TJ LOAD + ­ LOAD + ­ LOAD + ­ LOAD + ­ + ­ + ­ + ­ + ­ 4 Active Low 321 HIGH-PASS 20Hz 40Hz 60Hz 80Hz MASTER COMP SLAVE ON ON ON MODE 4 Vr Vc REMOTE 3 Vr Vc Use Rane VR 2 1 2 3 4 1 2 3 4 50/60 Hz 500 WATTS 4 3 2 1 1 2 3 4 EXP ON Vr Vc Vr Vc Manual- · Individual FAULT FLAG ports are provided for each channel. MADE IN U.S.A. OUTPUTS MA 4 ACN 001 345 482 Class 2 Wiring º When a fault isRANE CORP. on power up, the channel or channels affected are not enabled, and the appropriate detected INT EXT INT EXT INT EXT INT EXT 4 3 2 1 front panel fault indicators are lit. A detected fault is re-tested every 10 seconds. COMMERCIAL For continued LOAD LOAD LOAD AUDIO grounding º When a channel develops a fault while operating, theEQUIPMENT shuts down and the output relay is turned OFF. channel LOAD protection +­+­ +­+­ +­+­ +­+­ 24TJ do not remove A detected fault is re-tested every 10 seconds. screw º Possible faults include: supply under-voltage, over-voltage, voltage imbalance, output short to ground, output C US 100-240V short to supply, output short to output, clock not running, over+safe temperature. ­ + ­ + ­ + ­ + ­ ­+­ +­+ LISTED 50/60 Hz 500 WATTS º 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 (see Master/Slave below). º The fault flag uses 5 volt logic with high-side active drive and passive pull down. No fault = +5V. Fault = 0V. R FAULT FLAG 4 Active Low 321 HIGH-PASS 20Hz 40Hz 60Hz 80Hz MASTER C SLAVE ON ON MODE 1 2 3 4 1 2 3 4 3 2 1 1 2 3 4 EXP ON · Each channel is set for MASTER (up) or SLAVE (down) operation using the rear panel dipswitch. º Master channels write fault flag status. º Slave channels read fault flag status. º The Master setting is used for remote fault reporting and/or automatic redundancy switching control. º The Slave setting is used for individual channel remote power sequencing or automatic redundancy switching. · Internal automatic redundancy switching is provided (see page Manual-4). MADE IN U.S.A. OUTPUTS ACN 001 345 º The primary amplifier channel is set to Master.MA 4backup amplifier chan- 482 The RANE CORP. Class 2 Wiring INT EXT INT EXT INT EXT INT EXT nel is set to Slave. The Master fault flag is wired to the Slave fault flag. If two 4 3 2 1 COMMERCIAL For continued LOAD LOAD LOAD AUDIO different MA 4 amplifiers are involved (recommended), also wire the fault flag LOAD grounding EQUIPMENT protection +­+­ +­+­ +­+­ +­+­ grounds together. Drive Master and Slave audio inputs from not remove source, the same 24TJ do screw and set the SENSITIVITY controls the same. Master and Slave front panel C US power switches must be ON. 100-240V +­+­ +­+­ +­+­ +­+­ LISTED 50/60 Hz 500 WATTS º When a fault is detected on a Master amplifier channel, that channel is shut down, the output relay is switched to off, internally connecting the load to the EXTernal amplifier input. The front panel fault indicator is then lit. º The Slave channel remains in low-power standby (Ready indicator flashing) until a fault is detected (fault flag no longer driven high by the Master channel). When a fault is detected, the Slave channel performs a self test, switches to run mode, and closes the output relay (takes about 500 ms). The output of the Slave channel is connected to the EXTernal amplifier input on the Master channel. R FAU FLA 4 Active 32 4 3 2 · Comprehensive front panel metering is included for each channel: º Headroom meters are four-segment. The peak signal level is compared to the limit threshold and the difference in dB is displayed as remaining headroom. The limiter threshold is adjusted to account for the average load impedance, resulting in load compensated headroom indication. º Red Limiter, yellow Compressor and yellow Expander indicators light when the associated dynamics control is active. º A red Fault indicator lights when a fault is detected º The green Load indicator is off when impedance is above 16 , on when impedance is between 2 and 16 and flashing when the impedance is below 2 . º The green Ready indicator is off when the power switch is off, flashing when the power switch is on and the unit is in standby (Slave channel with high fault flag) and on when the channel is active. 1 3 6 12 24 dB Headroom Limit Comp Exp Fault Load Ready 3 6 12 24 dB Headroom 2 Limit Comp Exp Fault Load Ready 3 6 12 24 dB Headroom 3 Limit Comp Exp Fault Load Ready 3 6 12 24 dB Headroom 4 Limit Comp Exp Fault Load Ready ON Manual- Advanced Applications Remote Turn-on To operate an amplifier channel in low power standby with remote turn-on, set its rear panel switch to SLAVE. External +5 volts connected to the FAULT FLAG holds the amplifier in standby. Floating the FAULT FLAG or connecting it to ground turns the channel on. MADE IN U.S.A. RANE CORP. MA 4 For continued grounding protection do not remove screw ACN 001 345 482 COMMERCIAL AUDIO EQUIPMENT 24TJ 4 + INT EXT 3 + Class 2 Wiring INT EXT INT EXT OUTPUTS 2 + 1 + INT EXT LOAD ­ + ­ LOAD ­ + ­ LOAD ­ + ­ LOAD ­ + ­ 4 FAULT FLAG Active Low 321 HIGH-PASS 20Hz 40Hz 60Hz 80Hz MASTER COMP SLAVE ON ON ON MODE INPUTS 4 Vr Vc REMOTE LEVEL 3 2 Use Rane VR 2 or 20 k pot Vr Vc Vr Vc 1 Vr Vc 4 SENSITIVITY 3 SENSITIVITY 13 2 SENSITIVITY 13 1 SENSITIVITY 13 +­ +­ 4 +­ 4 +­ 4 13 100-240V 50/60 Hz 500 WATTS C R US + ­ + ­ + ­ + ­ + ­ + ­ + ­ + ­ 4 3 2 1 22 1 2 3 4 1 2 3 4 22 22 22 4 dBu Vr Vc Vr Vc Vr Vc Vr Vc dBu dBu dBu LISTED 1 2 3 4 EXP ON +­ +­ +­ +­ +5V Fault Reporting To have an amplifier channel report a fault to a control system or back up amplifier, set it to Master. The Fault Flag is held high (+5 volts) during normal operation and goes low (passive pull down) when a fault occurs. For details on Fault Flag operation, ...