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EN POWER AMPLIFIERS – E series – Low impedance and 70V line
Lab Gruppen E series amplifiers have been manufactured and designed for installations in retail, education, restaurants and offices, where high quality and high energy-efficiency is required. These Class-D amplifiers each have a temperature-controlled fan that turns off when only low-level signals are detected, helping the amplifier comply with Energy Star efficiency certifications.
The six models, available in differing power output options, include the E2:2, E4:2, E8:2, and E12:2 which all have two input channels and two amplified output channels; and the E5:4 and E10:4 which have four input channels and four amplified output channels. Each output can be switched to either ‘Lo-Z’, to provide power to 8 ohm or 4 ohm loads, (2 ohm loads may be used on the E4:2, E8:2 and E12:2 models), or ’70V’ to provide output to 70V line or 16ohm speakers. 100V line speakers can be connected and used while the output channel is set to 70V, however the output power will be half of the selected tap. Each amplifier can also be used asymmetrically whereby one channel is set to deliver a differing output to the other channel(s). All six amplifiers use automatic-standby mode technology whereby the unit is set to standby, consuming less than 1 watt, if no audio input signal is sensed for a period of 20 minutes; the amplifier is returned to full operating state when an input signal returns.
The rear panel houses all input and output connectivity and setting controls, with three-pole detachable screw terminal block connectors for inputs and outputs The output connectors can accommodate cable of up to 4 mm square cross section. Attenuators with a range of infinity to 0dB can be manually adjusted to affect the channel gain, and a high-pass filter can be switched on/off to insert a 50Hz filter before the output stage. A power button can be momentarily depressed to change the power state from standby to on with a multi-coloured LED indicator showing amber for automatic standby status, red for forced standby status, and green for power on. A single IEC power inlet provides 100-240VAC power to the amplifier.
The 1U high front panel is used for power amplifier and channel status indication. A bi-colour LED illuminates green when power is on and amber when the amplifier is currently in standby mode. A ‘TEMP’ LED flashes amber to indicate excessive temperature in the power supply section or output stages. When the temperature exceeds the ‘danger’ threshold, the LED turns to constant amber illumination and the amplifier self-mutes. Green LEDs, one per channel, indicate an input signal in excess of the signal present threshold and a second LED per channel illuminates when the amplifiers limiting stage is engaged.
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