Усилители мощности стерео — Arcam PA240

Arcam, a brand of HARMAN International, lists the PA240 as a stereo Class G power amplifier. It is part of the same range as the PA410 and the multichannel PA720. The amplifier can run in stereo, dual mono or bridged mode, so a single chassis can drive a stereo pair or one loudspeaker with both channels combined.

Key specs that matter

Continuous output at 0.2 percent THD is 225 W per channel into 8 ohms and 380 W per channel into 4 ohms, with both channels driven from 20 Hz to 20 kHz. Bridged into 8 ohms, one channel delivers 790 W across the same band. Harmonic distortion is 0.001 percent at 80 percent of rated power into 8 ohms at 1 kHz. Input sensitivity for 200 W into 8 ohms is 1.15 V RMS on the RCA sockets and 2.3 V RMS on the XLR sockets, and input impedance is 10 kilohms. Measured at 50 W into 8 ohms, noise is 110 dB down, A-weighted. Frequency response is 20 Hz to 20 kHz within plus or minus 0.05 dB. Maximum consumption is 1.5 kW, typical idle draw is 90 W with a thermal dissipation of about 340 BTU per hour, and standby stays under 0.5 W. Mains voltage is 110 to 120 V or 220 to 240 V at 50 to 60 Hz. The unit measures 433 x 425 x 177 mm including feet, control knob and speaker terminals, and weighs 18 kg net or 19.7 kg packed.

Engineering and use context

The PA240 uses Class G amplification, and the first 50 W run in Class A before the higher supply rails come into use. Arcam lists a toroidal transformer in the power supply, an acoustically damped chassis and paralleled transistor output stages. Inputs are switchable between RCA and balanced XLR. An Ethernet port links the amplifier to a network and home automation systems, an RS232 port allows third-party remote control, and a Type-A USB port is provided for firmware updates. Arcam supplies custom installation notes, multilingual user manuals, software updates and integration modules for the Elan, RTi and URC control systems.

Pairing

The switchable XLR and RCA inputs let the PA240 take its signal from a stereo preamplifier, while the Ethernet and RS232 ports tie it into home automation, where Arcam integration modules for control systems handle switching, and the bridged mode lets two units drive a stereo pair.

Alternatives

The Arcam PA410 is a smaller Class AB power amplifier that can serve two or four channels.