Arcam PA720 7x100W Home Theater Multichannel Power Amplifier Grey

The Arcam PA720 high performance multi-channel power amplifier features seven channels of efficient Class G amplification, delivering an impressive 140W per channel, ensuring maximum flexibility and power without compromising control.

The Arcam PA720 also features the finest components including a toroidal power supply, acoustically damped chassis, parallel transistor output stages and exceptionally low distortion levels (0.002% 1kHz/8ohms).

Offering 140W per channel into seven driven into a 4ohm load (100W into 8ohm), the PA720 is capable of delivering up to 175W per channel with five channels driven and up to 225W with two channels driven.

Class G amplification, which is found in a number of Arcam products, is a derivative of Class AB, however, a trick is used in the power supply stage to increase efficiency. In practice, the power supply can provide two different supply voltages (a lower one and a higher one) and there is a part of the circuit (lift) that takes care of switching appropriately between the two.

In the absence of a signal or with a small signal, which requires “little” output power, which can be obtained without problems with the lower power supply, the electronics (especially the final stage) is powered with the low voltage and therefore less bias current flows and the dissipation is lower. When instead there are peaks that require greater power, the power supply is switched and the higher one is used, so as to be able to supply the required power only for the necessary time. Efficiency can thus exceed 80% (85.9% theoretical maximum).

Highlights:

7-channel power amplifier

7 x 100W Class G amplification (8ohm, 20Hz-20kHz, 0.2% THD)

Class G amplification with 20W of Class A operation

Toroidal transformer

Ethernet, RS232 control

Switchable RCA or balanced XLR inputs

Technical features:

High voltage Class G amplifier, first 20W in Class A

Continuous output power at 0.2% THD per channel

Seven channels driven: 140 W/100 W (4Ω/8Ω) 20Hz - 20kHz

Five channels driven: 175 W / 110 W (4Ω/8Ω) 1kHz

Two channels driven: 225 W / 140 W (4Ω/8Ω) 1kHz

Harmonic distortion 80% power 8Ω at 1kHz: 0.002%

Frequency response: 20 - 20 kHz (+/- 0.05dB)

7 unbalanced RCA inputs

7 balanced XLR inputs

Input sensitivity: RCA: 800 mV RMS - XLR: 1.6 V RMS

Input impedance: 10kΩ

S/N ratio: 105dB

Toroidal power transformer for low noise, high current output

Switchable RCA/XLR input mode

Grouped pairs of speaker outputs with binding post connectors

USB Type-A port for firmware updates

RS-232 and Ethernet ports for control via 3rd party automation systems

12 volt trigger input and output

Max power consumption: 1.5 kW

Typical power consumption: 90 W

Standby consumption: <0.5 W

Dimensions: 433 x 177 x 425 mm (WxHxD)

Weight: 18 kg