Apr 8, 2010 12:00 PM, By Bennett Liles
The Nady Systems SPA 2400 provides a range of running mode options including a user-defeatable clip limiter, continuously variable-speed fan, switchable 30Hz low-cut filter, and XLR and TRS input connections, along with dual-channel, parallel input, and bridged mono operating selection. Outputs feature both binding post and Neutrik Speakon connections, and there is a ground-lift switch. The unit puts 750W into each of two channels at 4Ω and 2400W into 4Ω in bridged mono mode.
A resonant switch-mode power supply, two channels with independent 100Hz crossovers, and high-speed class-D topology typify the IPR series amplifiers from Peavey. The IPR DSP 6000 puts 200W RMS into each channel at 4Ω, and it includes built-in 32-point digital signal processing, program-specific EQ presets, crossover and stereo/mono operation with setup wizard, and lockable security settings that are adjusted using a front-panel LCD screen. Protection circuitry includes Peavey’s DDT loudspeaker protection with multipoint clip sampling along with DC, temperature, signal, and active safeguards.
Introduced at InfoComm 09, the Duecanali5204 from Powersoft is an installation version of the K3 amplifier. The class-D unit puts 1400W into an 8Ω load and 2600W into 4Ω. In bridged mono mode, the output is 3900W into 8Ω and 4800W into 4Ω. It also incorporates the patented Powersoft automatic voltage-selection feature. Integrated DSP provides up to 16 EQ filters per channel and a delay in each channel of up to 2 seconds.
For applications requiring maximum channel density in minimum space, the QSC CX168 has eight channels and is equipped with QSC’s PowerWave switching power supply technology to run with less noise. Safety circuits include protection from DC, infrasonic, thermal overload, and short-circuit faults. QSControl, QSC’s audio networking system, can be used through four HD-15 data ports to control the CX168’s gain levels and to monitor clipping, thermal status, and other system parameters.
When a higher degree of remote control is needed in a multichannel amplifier, the MA 4 from Rane can provide four areas of sound control with 100W into each with terminals for remote level control and built-in load monitoring, adjustable high-pass filters, fault reporting, and redundancy switching. Optional 70V/100V transformers are available, and there is adjustable dynamics control for temperature, sensitivity setting, and load impedance.
The SX3200 power amp from Samson is a 2-channel unit delivering 800W at 8Ω and 1100W at 4Ω, and in bridged mono mode, it provides 2200W into an 8Ω load. LED indicators display power levels for each channel, and combination input connectors allow for the use of either 1/4in. or XLR connectors. Protection circuits avoid overheating or damage from bad connections and prevent thumps in the loudspeakers when the amp is powered up. Two temperature-sensitive, variable-speed fans provide cooling.
For seven-zone sound control through a 70V or 25V loudspeaker system, the Speco Technologies PL200M 160W commercial amplifier features front-panel zonal on/off buttons and source selection buttons with the ability to play different sources in different zones at the same time via one unit. There is also a preamp input and auxiliary and booster outputs, three combination 1/4in./XLR mic/line/phantom inputs, and two RCA auxiliary inputs. The output terminals include 4Ω, 8Ω, and 16Ω loudspeaker terminals and a music-on-hold feature.
At the other end of the power scale and offering compact, low-cost push for sound is the CVA-50-1 from Stewart Audio. The ace for this model is getting power into small places, and the unit’s plenum rating and remote control feature are key to this. Using Signal Sense Power Technology, the amp is only powered when there is an audio signal on the input. The unit delivers 100Hz to 20kHz sound with a signal-to-noise ratio better than 90dB. The level control is screwdriver-adjustable, and the front panel includes LED indicators for power, signal presence, and clipping.
Top of the Juice line of power amps from Tapco, the J∙2500 delivers 575W into each of its two channels in an 8Ω load and up to 2500W into 4Ω in bridged mono mode. It offers switchable low-cut filters and switchable limiters on each channel. Detented rotary gain controls are calibrated in decibels, and the front panel includes signal presence, power, and overload-warning LEDs. Cooling is handled by variable-speed fans with back-to-front airflow.
The TOA DA-550F is an installation amplifier delivering 550W into each of four channels at 4Ω and 350W per channel into an 8Ω load. The channels can be bridged, enabling an output of 1100W into each of two channels at 8Ω. The input signal to channel 1 can be routed to all channels with individual gain control on each channel output. All channels offer input/output status LED indication, and input connections feature both removable terminal blocks and XLR terminals.
Most powerful of the Yamaha TXn series amplifiers, the TX6n offers 2-channel analog input and includes AES/EBU signal capability with its digital input MY card feature, which supports a variety of other audio formats. Through a connected computer running the Amp Editor software application, control and monitoring functions—including switching the amplifier’s on/standby and mute status along with considerable DSP features—can be done in addition to handling these functions on the unit’s front panel. The TX6n delivers 1100W per channel into 8Ω and up to 5980W into 4Ω in bridged mono mode.
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