2.2 Operating Voltage
The power amplifier receives its power supply via the mains input. During installation, always separate the power amplifier from the mains. Connect the power amplifier only to a mains network, which corresponds to the requirements indicated on the type plate.
Device | Voltage | Frequency | Power Consumption |
| | | |
DSA 8405 | 220-240 V AC / 120 V AC / 100 V AC | 50-60 Hz | 490 W |
| | | |
DSA 8405 | 220-240 V AC / 120 V AC / 100 V AC | 50-60 Hz | 840 W |
| | | |
DSA 8805 | 220-240 V AC / 120 V AC / 100 V AC | 50-60 Hz | 930 W |
| | | |
Table 2.1: Operating Voltage
Mains Operation and Resulting Temperature
The power drawn from the mains network is converted into output power to feed the connected loudspeaker systems and into heat. The difference between power consumption and dispensed power is called power dissipation (Pd). The amount of heat resulting from power dissipation might remain inside of a rack-shelf and needs to be diverted using appropriate measures. The tables on page 36 allow the determination of power supply and cabling requirements. The tables are meant as auxiliary means for calculating temperatures inside of a rack-shelf system/cabinet and the ventilation efforts necessary.
The column Pd lists the leakage power in relation to different operational states. The column BTU/hr lists the dispensed heat amount per hour. The following factors allow direct proportional calculation of the mains current Imains for different mains supply voltages: 100 V = 2.3, 120 V = 1.9, 220 V = 1.05, 240 V = 0.97.
2.3 Mains Switch
The Mains Switch on the front panel separates the power amp from the mains. Turning the Mains Switch to ON starts booting up the power amp. A soft start circuit compensates mains inrush current peaks and thus prevents the automatic cutout of the mains from reacting when switching on the power amplifier. Speaker system switch-on is delayed by approximately 4 seconds, effectively suppressing any possible power-on noise, which otherwise might be heard through the loudspeakers.
2.4 Mounting
DSA amplifiers have been designed for installation in a conventional 19-inch rack case. Attach the power amp with its frontal rack mount ears using 4 screws and washers as shown in following illustration. Additionally securing the amplifier at the rear becomes necessary, if the rack case in which the power amplifier has been installed will be transported. Failure to do so may result in damage to the power amplifier as well as to the rack case. Attach the power amp as shown in the illustration using 4 case nuts and screws. RMK-15 brackets for securing the power amplifier are available as accessories.
2.5 Ventilation
As with all Dynacord power amps with fan cooling, the airflow direction is front-to-rear, obviously because there is more cold air outside of the rack case than inside. The power amplifier remains cooler and dissipating the developing waste heat in a specific direction gets easier. In general, setting up or mounting the power amplifier has to be done in a way that fresh air can enter unhindered at the front and exhausted air can exit at the rear. When installing the power amp in a case or rack system, attention should be paid to these details to provide sufficient ventilation. Allow for an air duct of at least 60 mm x 330 mm between the rear panel of the power amplifier and the inner wall of the cabinet/rack case. Make sure that the duct reaches up to the cabinet’s or the rack case’s top ventilation louvers. Leave room of at least 100 mm above the cabinet/rack case for
