Apr 15, 2014 10:31 AM, By Bennett Liles
A proven design both on the road and in fixed installations, the FRS series amplifiers from Mackie have multi-speed fans that adapt to the operating temperature and minimize noise. The more powerful of the models is the 2-channel FRS-2800 with 1300W into each channel at 2Ω and up to 2800W in bridged mono mode. Six-segment LEDs are used for metering on each channel, and the amp is protected from shorts, under-impedance loads, over current, and overheating. The inputs have space-saving XLR/TRS connectors and looping XLRs while the outputs are on NL4 and binding posts. There is also a third NL4 for bridged mode output. Capable of sending high power into multiple zones, the 2RU Ottocanali series amplifiers also have redundant switch mode power supply for mission critical reliability.
Powersoft Audio has designed the 12K4 model with 1000W into each of eight channels at 2Ω and 1500W into each channel in 70V/100V operation mode. Equipped with multi-function DIP switches on the rear panel for impedance, voltage, and filters, the 12K4 also has individual attenuator settings for each channel located behind a front-panel cover. Every channel also features a switchable power-saving mode in which the amplifier goes into low-power operation when there is no signal for more than four seconds.
The CXD Series power amplifiers from QSC are built to allow greater installation flexibility using Flexible Amplifier Summing Technology (FAST), which allows the total power of the unit to be spread across one or more of its four channels. The CXD4.5 model delivers up to 1600W (burst) into each of its four channels. Onboard DSP provides crossover and parametric EQ filters, limiting, and alignment delay while all setup parameters can be stored in up to 50 presets. Controls and indicators include power, channel selects and mutes, input signal, and clip LEDs along with navigation and selection buttons for the front-panel LCD screen. This detailed screen can be used to show a wide variety of preset values and setup parameters.
Multi-channel performance in tight spaces is the specialty of Rane’s MA 4 4-channel, 1RU amplifier with its remote level controls and individual input sensitivity settings. The optional VR 2 wired remote mounts in a standard electrical wall box and allows level control from within its zone. In addition to level-indicating LEDs, the front panel provides compression and limiting indicators as well as ready, fault, and load lights. On the rear panel are DIP switch settings for master/slave operation, high-pass filtering, and compressor/expander. With 100W into each channel, the unit is well suited for small conference rooms, paging, and background music applications.
Speco Technologies designed the P500A Class D amplifier to drive large numbers of commercial speakers with 500W RMS power into a single output that can be used for low impedance or 70V/100V systems. Equipped with an auxiliary high-level XLR output, the unit can feed more amps to scale up the installed system. The front panel of the 2RU chassis includes LED indicators for protection notification, clipping, and signal presence along with a rotary level control.
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