Measurements and conclusion
Contents
We measured the AVM Inspiration CS 2.3 using our Prism dScope III and the Picoscope 5000 with Tekbox LISN. The latter setup allows us to map the noise from the power supply and determine if some of it “leaks through” into the device.
Measurements AVM Inspiration CS 2.3
The AVM measures nicely considering the amount of electronics AMV has built in. Realize that the Germans really got everything into this compact enclosure: a power supply, streamer, analog inputs, digital inputs a dac and a CD player.
We see that the Class D amplifier performs nicely. The power is nicely achieved and the distortion is quite low: no more than 0.035% within the audible range. The DAC and streamer also function nicely: we actually measure no difference between digital and analog. In short: neat work here. Measuring jitter in such a device is practically impossible without pulling everything open. So we didn’t do that. We are going to stop using the J-Test, as it is not a solid test.
Power supply noise on the mains side can be improved. We measure a fluctuating spectrum on the mains side – that is, not from the speaker output. We guess that this is from the processors in the device.
At the output we don’t see this directly, but higher in the band – above 30 KHz – we do see some noise. We can understand this, given the compactness of the device and the amount of functionality.
