Apr 8, 2010 12:00 PM, By Bennett Liles
The Crown Audio CDi series is designed especially for installation, and the CDi 6000 can output on barrier strips 3000W into each of two channels with a 2Ω load, 2000W per channel with a 70V system, and 5000W into a 140V system in bridged mono mode. The CDi 6000 also features proportional fan-speed cooling; output short and thermal protection circuits; and onboard DSP including crossovers, EQ filters, delay, and output limiting.
Designed for permanent installations using 70V/100V loudspeaker systems, the AXYS PB800 from Duran Audio is composed of eight separate AB class power amplifiers and a two-in, eight-out digital-signal-processing unit. The amplifier features soft-knee over current protection, and a low-power standby switch mode allows networked shutdown of the main supply. The 32-bit floating-point DSP includes attenuate, delay, equalization, filters, compression, and limiting on the individual channels.
For mobile and club sound systems, the Dynacord SL 2400 is the most powerful amplifier in the SL series with 2400W into each channel at 2Ω and 3600W at 4Ω in bridged mono mode. The unit incorporates protection for thermal, overload, short circuit, HF, and DC faults along with a patented LPN filter for switchable phase response correction on the loudspeaker load. The SL2400 has a 1kHz referenced gain of 32dB and a maximum input level of +21dB.
Intended for continuous duty cycle applications in paging and sound reinforcement, the CAZ2500 from EAW provides a continuous power level at 8Ω of 575W per channel into its two channels and 1500W in bridged mode. With a 4Ω load, the amplifier pushes 750W per channel and 2500W in bridged mode. It features a switchable low-cut filter at 30Hz and a switchable limiter. The front panel includes gain knobs along with signal presence and gain overload LEDs.
The PA4150L from Electro-Voice is made for multichannel applications using a minimum of rack space with four channels in a 2RU frame. The rear panel features marked level controls along with Phoenix connectors on all inputs and outputs. Front-panel LEDs indicate signal presence, 0dB, and limiting, and each channel includes a selectable 50Hz/300Hz high-pass filter. The unit provides 160W into each of the four channels.
Extron Electronics’ answer for high-power multichannel sound in a 1RU case is the XPA 2004, an Energy Star-qualified amplifier that puts 200W at 4Ω into each of its four channels. A class-D design with a 100dB signal-to-noise ratio, the XPA 2004 is convection-cooled for quiet operation. It goes into standby mode using less than 1W after 1 hour of no signal, and it has protection circuits for limiting, thermal overload, shorts, and DC.
The solution for multichannel amplification in a 2RU enclosure from Lab.gruppen is the C 20:8X, with continuous output power of 250W per channel into outputs of 70V, 4Ω, 8Ω, and 16Ω. Each channel is individually configurable for a specific application or load condition. The unit’s gain may be configured in 4-channel groups along with a 35Hz high-pass filter, and the Voltage Peak Limiter (VPL) feature permits each channel to be configured for the reactive characteristics of the connected load.
The FRS2800 from Mackie is at the top of the FRS line, with 2800W continuous power in mono bridged mode into 4Ω. Like the others in the line, it features a front-panel, six-segment LED meter for each channel along with a defeatable clip limiter and short, thermal, over-current, and under-impedance protection. The multispeed cooling fans change speed automatically according to operating temperature, and there is a third Neutrik Speakon connector carrying the bridged mono output.
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