Arcam AVR750 7.1 A/V Receiver


Design and Setup of the Arcam AVR750 Receiver

The Arcam AVR750 is a beast when you lift it. Though it only comes in at 37 lbs. it is a dense component that feels much heavier. The design is the same look that Arcam has been using with their components for years. The front is a dark matte gray and a slight curve to it with some buttons and a total absence of knobs. Much more interesting is the rear with its selection of inputs and outputs. A surprising omission is a multichannel input as some people still prefer multi-channel audio over analog from components like the Oppo BDP-105.

There is a selection of 7 HDMI inputs along with 3 component video and 4 composite video inputs. S-Video inputs have now vanished for everyone it seems. There are 6 stereo RCA inputs along with 4 Coaxial and 2 Optical inputs for audio but no phono stage. Streaming audio is available with the Ethernet input and there is also a USB input for music. There is a front 3.5mm input (analog and optical) for your portable media devices as well.

There is also no Bluetooth or Airplay included with the Arcam. You will need to add on a streaming device, like an Apple TV or Arcam's own streaming boxes, if you want to get music from your phone or computer to the Arcam to listen to. This isn't expensive to do, but as more and more people stream content the lack of any support for that is a bit odd.

The AVR750 does not use the AVR LSI chip that degrades the performance of most AVRs but instead uses many individual ICs optimized to yield better performance.

The performance enhancement will be seen in the measurement section. The volume control chip is the Cirrus CS3318. The current full line of Arcam AVRs uses this chip.

The amplifier section of the Arcam AVR750 is a Class G device. This allows the first 50 watts of the Arcam AVR750 operate as a standard class AB amplifier with a DC power supply voltage rail (30V) that will allow the amp to produce 50 Watts average power into 8 ohms When more power is needed it can switch the DC power supply rails (60V) to produce up to 210 Watts in stereo and 100 Watts per channel with all channels driven. . The Class G amp is more efficient than a Class AB since power dissipated by the output transistors is the same as a small 50 Watt amplifier except when the instantaneous program amplitude requires more than 50 watts to be dissipated to the speaker. For this small period of time the amplifier dissipates heat of the power of a 200-watt amplifier.

The disadvantage of Class G is the switching action of the supply rail can introduce a distortion term. This will be seen in the measurement section.

The lower priced Arcam AVRs in the current lineup use class AB amplifiers.

The Arcam AVR750 includes its own room correction system that is proprietary to their hardware. With the included microphone it manages to place my speakers the correct distance away, down to half an inch, and has accurate crossover points for them. The process completes in less than 10 minutes and with accurate results, I would recommend using it. By default the Arcam does not enable any room correction.

The included remote is a small backlit number that is functional but nothing distinctive. It works well enough but when you are spending this much for a receiver I would like a model that uses RF instead of IR, and that provides a screen with feedback. Most people likely will use the Arcam with another control system so I imagine this remote will not matter to most.

I tested the Arcam AVR750 in two different systems: One consisting of five Paradigm Millennia One speakers and an SVS PB-1000 subwoofer and one utilizing Definitive Technology Mythos STS speakers, a Mythos 9 center and Gem surrounds with the same PB-1000 subwoofer. Arcam provided their BDP300 Blu-ray player with it as well, which I utilized along with my usual Oppo BDP-105 and BDP-103D for sources. Go to Page 3: In Use