Apr 15, 2014 10:31 AM, By Bennett Liles
For touring or installation, Electro-Voice markets the TG7 power amp with 3500W per channel in a grounded bridge Class-H design with a switch-mode power supply. The 2-channel unit has an LCD screen for setup and monitoring sharing the front panel with individual LEDs for level indication, bridged/parallel mode, power, standby, IRIS-net, protect, and mute. The amplifier can also be fitted with the optional RCM-28 OMNEO network and DSP module for grouping amps and other devices in remote monitoring and operation. The RCM-28 allows complete overview of system status and control of all system parameters.
At the other end of the size and power scale is the Extron MPA 152 Plus, a tiny quarter-rack space stereo device with 15W per channel at 4Ω. Its primary application is to drive two sets of 8Ω ceiling speakers, each set wired in parallel. In addition to its three inputs (RCA, 3.5mm mini, and captive screw), it features a defeatable automatic power-down timer that places it into a standby mode below 1W after 25 minutes of inactivity. It also has a clip limiter and a connection for an optional Extron VCM 100 or VCM 200 volume and mute controller or the VC 50 analog volume controller for remote operation, an unusual feature for such a small model.
Galaxy Audio offers a solution to both fixed and mobile applications with its G-Series amps, and at the top of the line is the G1200 with 400W into each of its two channels at 8Ω. All of the G-Series models have XLR and 1/4in. input terminals teamed with twist-lock output connectors. The front-panel LED indicators show power and bridge mode along with a signal and clip for each channel. The amp is thermal, short and DC-protected with individual front-panel level controls on a 2RU chassis. The G-Series also includes the G-440 and G-850 models.
The quiet little CSA-2120 2-channel power amplifier from JBL is convection cooled and it puts 120W into each channel, going into automatic standby mode and disabling the amp’s pulse width modulation generator in the absence of an input signal. Protected from overheating and low voltage, the unit has detachable Euroblock input and output connectors. The optional transformer module can be used for connection to higher impedance speaker systems. The level settings are screwdriver adjustable, and each channel has clip and signal presence LEDs. A rear-panel DIP switch can be used to set the auto standby as well as a 70Hz high-pass filter and peak limiter for each channel.
For covering multiple rooms or zones from a hidden source, Knoll Systems has a solution in the Q450, which has four 50W stereo amplifiers in one housing and is operated by remote MR44 keypads. For operation by third-party control systems, the Q450RS model can use serial control. The MR44 wall-mounted keypads feature backlit buttons in addition to volume, bass, and treble control. Balanced input wall plates may be located up to 1,500ft. away and are available with Bluetooth receivers. Four stereo input sources can be selected and controlled. If additional power is needed, the four line level zone outputs can be used to feed larger external amps.
At the top of the IPD series line of amplifiers by Lab.gruppen, the IPD 2400 provides big power in a small, 1RU space. Delivering 1200W into each of its two channels at 4Ω, the IPD 2400 incorporates a DSP engine offering 40 realtime multi-slope parametric EQs, adjustable gain, input and output delay, and high/low-pass filtering. The controls for DSP and limiting are on the front panel in the form of two navigation buttons, a rotary encoder, and backlit display. The IPD LoadLibrary provides a number of Lab.gruppen released preset configurations. The standard AES3 inputs can be set for automatic failover to analog, and there is mix capability for all four inputs. Outputs can be connected on binding posts or Neutrik speakON connectors.
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