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There’s a relatively loud humming coming from one or both speakers. What can I do?
It sounds like you have a ground loop issue. An unwanted voltage in the ground between your devices. The most common is that the cables are of bad quality. If this is not the case, then make sure you connect all the devices in the same system so they are all powered from the same AC outlet. If none of this helps and you have a TV or set-up box in your system. Pull out the antenna cable and see if the humming goes away. If it does, then you need to connect a ground loop isolator to your antenna cable.
Can I combine the use of Class A100 D3 as an integrated amplifier in my two channel stereo setup with the use as a power amplifier in the home theater setup?
This can be solved in two ways if your AV-receiver/pre-amp/processor has a pre out option for your front loudspeakers.
The first option is to connect an unbalanced audio cable from front pre out on your AV-receiver to an audio in input (for example the AUX input) on the Class A100 D3. When you do a room calibration with your AV-receiver/pre-amp/processor just keep it on a fixed volume and remember it. Every time you use the home theater setup you choose the same input and the volume as when you did the calibration.
The second option is to remove the jumpers between PRE OUT and AMP IN on the Class A100 D3 integrated amplifier. Use a Y-splitter to be able to connect two pair of unbalanced audio cables to the AMP IN input. One to replace the jumpers between PRE OUT and AMP IN and one between front pre out on your AV-receiver/pre-amp/processor and AMP IN on the Class A100 D3. Remember to do a new automatic room calibration measurement with your AV-receiver/pre-amp/processor if you have that option. Else you need to do it manually.
Connect your two channel sources to audio/digital in on the Class A100 D3 as you will use it as a pre amplifier.
These options can of course be used in combination with the other options explained for bi-amping of your loudspeakers and bridged mode for the power amplifier Class AP100.
What DAC does the Class A100 D3 use?
The DAC comes from Analog Devices and is a AD1955. It´s a very highly specified DA converter with external I/V conversion for maximum performance. In early models of the Class A100 DII AD1853 can be found, but as this was eventually discontinued we decided to change to AD1955, that can be found in for example Benchmark DAC1 & Nagra DAC.
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